Backend Engineer • Behavioral • medium

Describe a project where you had to balance paying down technical debt with delivering new product features. How did you prioritize?

#Technical Debt #Prioritization #Agile

Practice

Backend Engineer • Behavioral • medium

Tell me about a time you strongly disagreed with your squad on a technical approach. How did you resolve the disagreement?

#Conflict Resolution #Teamwork #Communication

Practice

Backend Engineer • Behavioral • medium

Spotify embraces a 'fail fast' culture. Tell me about a time you built something that completely failed or was scrapped. What did you learn?

#Resilience #Innovation #Agile

Practice

Backend Engineer • Behavioral • medium

Spotify is highly data-driven. Give an example of a time you used data or metrics to drive a significant architectural or technical decision.

#Data-Driven #Decision Making #Architecture

Practice

Backend Engineer • Behavioral • easy

Tell me about a time you had to learn a completely new technology or framework on the fly to solve a critical business problem.

#Adaptability #Learning #Problem Solving

Practice

Backend Engineer • Behavioral • medium

Spotify values 'sincere collaboration'. Give an example of a time you had to work with a difficult stakeholder or team member. How did you build trust?

#Collaboration #Empathy #Conflict Resolution

Practice

Backend Engineer • Behavioral • hard

Describe a production outage you caused or were involved in resolving. What was the root cause, and what was the outcome of the post-mortem?

#Incident Management #Accountability #Continuous Improvement

Practice

Backend Engineer • Behavioral • medium

Tell me about a time you had to push back on a Product Manager's timeline because of technical constraints. How did you handle it?

#Communication #Stakeholder Management #Prioritization

Practice

Backend Engineer • Coding • medium

Implement a rate limiter for the Spotify Web API. The rate limiter should allow a maximum of 100 requests per minute per user ID.

#Concurrency #Design #Queue

Practice

Backend Engineer • Coding • hard

Spotify users can organize playlists into folders. Given a nested folder structure, serialize it into a string and deserialize it back into the original structure.

#Tree #DFS #Serialization

Practice

Backend Engineer • Coding • medium

Given a user's listening history as a string of song genres, find the length of the longest contiguous listening session that contains at most two distinct genres.

#Sliding Window #Hash Map #String

Practice

Backend Engineer • Coding • medium

Design a hit counter that records the number of times a specific podcast episode was played in the past 5 minutes.

#Queue #Design #Time Series

Practice

Backend Engineer • Coding • easy

Given an array of song durations, find two songs that add up to exactly the length of a given commute time minus 30 seconds (for a crossfade).

#Array #Hash Map #Two Pointers

Practice

Backend Engineer • Coding • medium

Design an LRU (Least Recently Used) cache to store a user's recently played tracks. The cache should support get and put operations in O(1) time.

#Linked List #Hash Map #Design

Practice

Backend Engineer • Coding • medium

Given a stream of song IDs played by users, write a function to return the top K most frequently played songs in the last 24 hours.

#Heap #Hash Map #Sliding Window

Practice

Backend Engineer • Coding • hard

You are given K sorted playlists, where each playlist is a list of song objects sorted by release date. Merge all playlists into one single sorted playlist.

#Divide and Conquer #Heap #Linked List

Practice

Backend Engineer • Coding • medium

Write an algorithm to simulate Spotify's 'Shuffle' feature. Given a playlist of N songs, ensure that every song has an equal probability of being chosen, and no song is played twice until all have been played.

#Array #Math #Randomization

Practice

Backend Engineer • Coding • medium

Find the shortest path between two artists based on their collaborations. You are given an API that returns a list of collaborated artists for a given artist ID.

#Graph #BFS #API Integration

Practice

Backend Engineer • System Design • medium

Design a collaborative playlist feature where multiple users can add, remove, and reorder tracks in real-time.

#WebSockets #Concurrency #Conflict Resolution #Pub/Sub

Practice

Backend Engineer • System Design • hard

Design Spotify's core audio streaming service. How do you ensure low latency playback and handle buffering?

#CDN #Streaming Protocols #Caching #Network

Practice

Backend Engineer • System Design • hard

Design the backend for Spotify Wrapped. How would you aggregate a year's worth of listening data for hundreds of millions of users?

#Batch Processing #MapReduce #Data Warehousing #Distributed Systems

Practice

Backend Engineer • System Design • medium

Design a podcast subscription system. Users should receive push notifications within 1 minute of a new episode being published by a creator they follow.

#Pub/Sub #Message Queues #Push Notifications #Fan-out

Practice

Backend Engineer • System Design • medium

Design Spotify's 'Friend Activity' feed. How do you display what your friends are currently listening to with minimal delay?

#Real-time #Caching #Graph Database #Polling vs WebSockets

Practice

Backend Engineer • System Design • hard

Design Spotify Jam (real-time listening parties). Multiple users in different locations need perfectly synchronized playback.

#Synchronization #WebSockets #Leader Election #Latency Compensation

Practice

Backend Engineer • System Design • medium

Design the search autocomplete system for Spotify. It needs to return results for tracks, artists, and albums in under 50ms.

#Trie #Elasticsearch #Caching #Distributed Systems

Practice

Backend Engineer • System Design • hard

Design a system to track song plays and calculate royalty payouts to artists. The system must be highly accurate and auditable.

#Event Sourcing #Exactly-once Processing #Databases #Financial Systems

Practice

Backend Engineer • System Design • medium

Design a distributed cache to store user profile data. How do you handle cache invalidation and hot keys?

#Caching #Consistent Hashing #Redis #Distributed Systems

Practice

Backend Engineer • System Design • hard

Design the serving layer for Spotify's Home screen recommendation engine. How do you serve personalized content to 500M+ users efficiently?

#Machine Learning Serving #Microservices #Caching #Load Balancing

Practice

Backend Engineer • Technical • medium

Write a SQL query to find the top 3 artists by total listening time in the last 30 days, given tables for 'users', 'plays', and 'tracks'.

#SQL #Joins #Aggregation #Window Functions

Practice

Backend Engineer • Technical • medium

A user reports that a specific playlist is taking 5 seconds to load. Explain how you would use distributed tracing to diagnose the bottleneck across 50+ microservices.

#Distributed Tracing #Debugging #Microservices

Practice

Backend Engineer • Technical • easy

Design the database schema for a user's 'Your Library' feature, which includes saved tracks, albums, and podcasts. How do you optimize for fast retrieval?

#Database Schema #Indexing #Normalization

Practice

Backend Engineer • Technical • medium

Compare gRPC and REST. Why might Spotify choose gRPC for communication between internal backend microservices?

#gRPC #REST #Protobuf #Networking

Practice

Backend Engineer • Technical • hard

Spotify uses Kafka heavily for event streaming. How do you ensure exactly-once processing for song play events to prevent overpaying royalties?

#Kafka #Concurrency #Idempotency #Databases

Practice

Backend Engineer • Technical • hard

Explain how you would migrate a legacy monolithic service to a microservices architecture without causing downtime for Spotify users.

#Microservices #Strangler Fig Pattern #Migration #Routing

Practice

Backend Engineer • Technical • medium

How would you handle a sudden, massive spike in traffic when a major artist (e.g., Taylor Swift) drops a highly anticipated album at midnight?

#Scalability #Auto-scaling #Rate Limiting #CDN

Practice

Data Engineer • Behavioral • medium

Tell me about a time you optimized a process or pipeline to save costs on cloud infrastructure.

#Cost Optimization #Cloud Computing #Impact

Practice

Data Engineer • Behavioral • medium

Describe a situation where a critical data pipeline failed in production. How did you troubleshoot it, and what did you do to prevent it from happening again?

#Incident Management #Problem Solving #Ownership

Practice

Data Engineer • Behavioral • medium

Tell me about a time you had to learn a completely new technology or framework on the fly to deliver a project on time.

#Adaptability #Learning #Agile

Practice

Data Engineer • Behavioral • easy

Give an example of how you mentored a junior engineer or shared knowledge across teams to improve overall engineering standards.

#Mentorship #Collaboration #Team Building

Practice

Data Engineer • Behavioral • medium

Tell me about a time you had to push back on a Product Manager or Data Scientist regarding a data engineering constraint or unrealistic deadline.

#Communication #Stakeholder Management #Prioritization

Practice

Data Engineer • Coding • medium

Implement a rate limiter for a Spotify API endpoint that allows a maximum of 100 requests per minute per user.

#Token Bucket #System Design #Concurrency

Practice

Data Engineer • Coding • easy

Given a playlist of track durations, find if there are two tracks that add up to exactly a target duration (Two Sum variant).

#Python #Hash Maps

Practice

Data Engineer • Coding • medium

Implement an LRU Cache to store a user's most recently played tracks.

#Linked Lists #Hash Maps #Object-Oriented Design

Practice

Data Engineer • Coding • easy

Write a script to parse a nested JSON payload representing a user's playlist and extract all unique genres, counting their frequencies.

#Python #JSON #Recursion

Practice

Data Engineer • Coding • medium

Write a Python function to find the top K most frequently played songs for a given user from a list of stream logs.

#Python #Hash Maps #Heaps

Practice

Data Engineer • Coding • medium

Given a list of user listening sessions with start and end timestamps, write a function to merge all overlapping sessions to calculate the total unique listening time.

#Python #Intervals #Sorting

Practice

Data Engineer • Coding • hard

Design a sliding window algorithm to count the number of streams a track received in the last 5 minutes, updating in real-time.

#Data Structures #Queues #Real-time Processing

Practice

Data Engineer • Coding • medium

Write a function to find the longest streak of consecutive days a user listened to a specific podcast.

#Python #Arrays #Hash Sets

Practice

Data Engineer • Coding • medium

Given a massive JSON log file of track events that cannot fit into memory, write a Python script to filter out skipped tracks and aggregate the total play duration per artist.

#Python #Generators #File I/O

Practice

Data Engineer • System Design • hard

Design a system to ingest, validate, and process 10 billion daily stream events from mobile clients.

#Ingestion #Kafka #Data Quality #Microservices

Practice

Data Engineer • System Design • hard

Design a dimensional data model (Star Schema) to support the backend analytics for Spotify Wrapped.

#Star Schema #Fact Tables #Dimension Tables

Practice

Data Engineer • System Design • hard

Design the end-to-end data pipeline for Spotify Wrapped. How do you process a year's worth of data for hundreds of millions of users?

#Batch Processing #GCP #Dataflow #BigQuery #Scalability

Practice

Data Engineer • System Design • hard

Design a real-time dashboard pipeline showing the top trending songs globally right now.

#Streaming #Kafka #Pub/Sub #Apache Flink #Redis

Practice

Data Engineer • System Design • hard

How would you migrate a massive legacy on-prem Hadoop pipeline to GCP Dataflow and BigQuery with zero downtime?

#Cloud Migration #GCP #Architecture

Practice

Data Engineer • System Design • medium

Design an A/B testing data pipeline to evaluate a new home screen recommendation algorithm.

#A/B Testing #Data Pipelines #Analytics

Practice

Data Engineer • System Design • hard

Design a pipeline to calculate royalty payments to artists at the end of the month based on complex, varying contract rules.

#Batch Processing #Financial Data #Idempotency #Airflow

Practice

Data Engineer • System Design • hard

Architect a system to detect fraudulent streams (e.g., bot farms looping a 31-second track) in near real-time.

#Fraud Detection #Streaming #Graph Processing #Machine Learning

Practice

Data Engineer • Technical • hard

Write a SQL query to find the median listening time per user without using built-in median functions.

#Window Functions #PERCENT_RANK #Math

Practice

Data Engineer • Technical • medium

How do you handle late-arriving stream events in BigQuery when calculating daily aggregations?

#BigQuery #Data Engineering #Event Time vs Processing Time

Practice

Data Engineer • Technical • hard

Write a query to identify 'bouncing' users—users who started a playlist, listened to less than 10 seconds of the first track, and did not play another track within 1 hour.

#LEAD/LAG #Window Functions #Time Intervals

Practice

Data Engineer • Technical • medium

What is the difference between a broadcast join and a shuffle join in Spark or Scio? When would you use each?

#Spark #Scio #Joins #Performance

Practice

Data Engineer • Technical • medium

Explain the difference between Apache Beam's Windowing and Triggers. Give a use case for each.

#Apache Beam #Streaming #GCP Dataflow

Practice

Data Engineer • Technical • hard

In a distributed join, how do you handle data skew? For example, joining a 'Streams' table with an 'Artists' table where Taylor Swift has 100x more streams than others.

#Spark #Data Skew #Distributed Computing

Practice

Data Engineer • Technical • medium

Explain how Kafka consumer groups work and what happens during a partition rebalance.

#Kafka #Distributed Systems

Practice

Data Engineer • Technical • hard

Write a SQL query to calculate the Month-over-Month retention rate of Spotify Premium users.

#Self Joins #CTEs #Cohort Analysis

Practice

Data Engineer • Technical • medium

Write a SQL query to identify the top 3 most skipped tracks (played for less than 30 seconds) in the last 24 hours.

#Filtering #Sorting #LIMIT

Practice

Data Engineer • Technical • easy

Write a SQL query to find users who listened to the exact same song more than 10 times in a single calendar day.

#GROUP BY #HAVING #Date Functions

Practice

Data Engineer • Technical • medium

Write a SQL query to calculate the 7-day rolling average of streams for each artist over the past month.

#Window Functions #Aggregations #Time Series

Practice

Data Engineer • Technical • medium

How do you ensure data quality and idempotency in an Apache Airflow DAG?

#Airflow #Data Quality #Idempotency

Practice

Data Engineer • Technical • medium

How do you optimize a slow-running BigQuery query that processes terabytes of data and frequently hits resource limits?

#BigQuery #Optimization #Partitioning #Clustering

Practice

Data Scientist • Behavioral • easy

How would you explain a p-value to a non-technical product manager?

#Statistics #Stakeholder Management

Practice

Data Scientist • Behavioral • medium

You are running an A/B test for a new recommendation algorithm, but the p-value is 0.06. Stakeholders want to launch it anyway because the UI looks better. What do you do?

#Communication #Statistics #Decision Making

Practice

Data Scientist • Behavioral • medium

Tell me about a time your model or analysis failed in production. What did you learn?

#Failure #Continuous Improvement #MLOps

Practice

Data Scientist • Behavioral • medium

Describe a project where you had to work with messy, unstructured data. How did you handle it?

#Data Engineering #Problem Solving

Practice

Data Scientist • Behavioral • easy

Spotify values being playful and sincere. Can you share an example of how you brought these traits to your previous team?

#Core Values #Teamwork

Practice

Data Scientist • Behavioral • medium

How do you prioritize your work when multiple product managers are asking for ad-hoc analyses simultaneously?

#Time Management #Prioritization #Stakeholder Management

Practice

Data Scientist • Behavioral • medium

Tell me about a time you had to push back on a stakeholder's request because the data didn't support their hypothesis.

#Communication #Conflict Resolution #Data-Driven Decisions

Practice

Data Scientist • Coding • medium

Write a SQL query to find the top 3 most streamed songs per country in the last 30 days.

#Window Functions #Aggregations

Practice

Data Scientist • Coding • hard

Given a table of user play events, write a query to calculate the average session length. A session ends after 30 minutes of inactivity.

#Sessionization #Window Functions #Advanced SQL

Practice

Data Scientist • Coding • medium

Write a SQL query to find the 7-day rolling average of daily streams for a specific artist.

#Window Functions #Time Series

Practice

Data Scientist • Coding • hard

Write a query to identify users who listened to the exact same sequence of 5 songs.

#String Aggregation #Window Functions #Self Joins

Practice

Data Scientist • Coding • easy

Write a Python function to calculate the cosine similarity between two user embedding vectors.

#Python #Math #Vectors

Practice

Data Scientist • Coding • medium

Given a list of user listening histories, write a function to find the longest contiguous subsegment of songs by the same artist.

#Python #Arrays #Two Pointers

Practice

Data Scientist • Coding • medium

Simulate a biased coin (e.g., 70% heads) using a fair coin in Python.

#Probability #Simulation #Python

Practice

Data Scientist • Coding • easy

Write a Pandas script to merge two large datasets of user demographics and listening history, handling missing values appropriately.

#Python #Pandas #Data Cleaning

Practice

Data Scientist • Coding • hard

Implement the K-means clustering algorithm from scratch in Python.

#Machine Learning #Python #Math

Practice

Data Scientist • System Design • hard

Design an ML pipeline to automatically classify podcasts into different genres based on audio and text features.

#NLP #Audio Processing #MLOps

Practice

Data Scientist • System Design • hard

Design a recommendation system for Spotify's Home page.

#Recommendation Systems #Architecture #Scalability

Practice

Data Scientist • System Design • hard

Design a system to detect fraudulent streams (e.g., bot farms artificially inflating play counts).

#Anomaly Detection #Streaming Data #Fraud

Practice

Data Scientist • Technical • medium

How would you design an A/B test to evaluate a new feature that automatically skips podcast intros?

#A/B Testing #Experimentation #Product Sense

Practice

Data Scientist • Technical • medium

How does collaborative filtering work, and how would you apply it to recommend podcasts to existing music listeners?

#Recommendation Systems #Collaborative Filtering #Cross-domain Recommendations

Practice

Data Scientist • Technical • hard

How do you handle the 'cold start' problem for a newly uploaded track with zero listens?

#Recommendation Systems #Cold Start #Content-based Filtering

Practice

Data Scientist • Technical • easy

What is the difference between a Type I and Type II error? Give a Spotify-specific example.

#Hypothesis Testing #Probability

Practice

Data Scientist • Technical • medium

If a user has a 10% chance of skipping a song, what is the probability they skip exactly 3 out of 10 songs?

#Probability #Binomial Distribution

Practice

Data Scientist • Technical • medium

How do you deal with outliers in user streaming data before running a regression model?

#Data Preprocessing #Modeling

Practice

Data Scientist • Technical • medium

Explain Simpson's Paradox and how it might occur when analyzing premium conversion rates across different regions.

#Data Analysis #Causal Inference

Practice

Data Scientist • Technical • medium

How would you use LLMs to improve the search experience on Spotify?

#LLMs #Search #NLP

Practice

Data Scientist • Technical • medium

How would you model user churn for Spotify Premium? What features would you include?

#Classification #Feature Engineering #Churn

Practice

Data Scientist • Technical • hard

We want to launch a new subscription tier for audiobooks. How would you estimate the cannibalization effect on our existing Premium tier?

#Causal Inference #Market Analysis #Experimentation

Practice

Data Scientist • Technical • medium

How would you optimize a slow-running SQL query that joins a billion-row streams table with a million-row users table?

#Query Optimization #Big Data #Performance

Practice

Data Scientist • Technical • easy

Explain the difference between implicit and explicit feedback. How does Spotify use both?

#Data Collection #Recommendation Systems

Practice

Data Scientist • Technical • medium

What evaluation metrics would you use for an offline playlist continuation model?

#Model Evaluation #Ranking Metrics

Practice

Data Scientist • Technical • medium

We noticed a 5% drop in daily active users (DAU) on the mobile app yesterday. How do you investigate this?

#Root Cause Analysis #Metrics #Data Investigation

Practice

Data Scientist • Technical • medium

How would you measure the success of the annual Spotify Wrapped campaign?

#Product Sense #Engagement Metrics #Viral Growth

Practice

Data Scientist • Technical • hard

Explain network effects in A/B testing. How would you account for them if we test a new collaborative playlist feature?

#A/B Testing #Network Effects #Advanced Statistics

Practice

DevOps Engineer • Behavioral • medium

Spotify values 'fail fast, learn faster.' Tell me about a time a deployment you managed failed spectacularly in production. What did you learn?

#Failure #Learning #Resilience #Accountability

Practice

DevOps Engineer • Behavioral • medium

Describe a blameless post-mortem you led. How did you ensure actionable takeaways without pointing fingers?

#Incident Management #Post-mortems #Culture #Continuous Improvement

Practice

DevOps Engineer • Behavioral • hard

Describe a situation where a critical production incident was caused by a gap in your monitoring. How did you handle the incident and the aftermath?

#Incident Management #Observability #Continuous Improvement

Practice

DevOps Engineer • Behavioral • medium

Tell me about a time you had to collaborate with a cross-functional team (engineers, product, data) to resolve a complex infrastructure issue.

#Collaboration #Cross-functional #Communication

Practice

DevOps Engineer • Behavioral • easy

How do you prioritize technical debt versus building new infrastructure features?

#Prioritization #Technical Debt #Productivity

Practice

DevOps Engineer • Behavioral • medium

Spotify operates on a model of high alignment, high autonomy. How do you ensure security and compliance standards are met without bottlenecking autonomous squads?

#Security #Autonomy #DevSecOps #Process Engineering

Practice

DevOps Engineer • Behavioral • medium

Tell me about a time you had to advocate for a DevOps best practice to an autonomous development squad that was resistant to change.

#Communication #Influence #Agile #DevOps Culture

Practice

DevOps Engineer • Coding • medium

Write a Go program that concurrently pings a set of internal services and reports their latency percentiles (p50, p90, p99).

#Go #Concurrency #Goroutines #Math/Statistics

Practice

DevOps Engineer • Coding • medium

Write a script that parses a Terraform plan JSON output and fails the CI build if any IAM policies are being modified to allow public access.

#Terraform #JSON #Security #CI/CD

Practice

DevOps Engineer • Coding • easy

Write a Dockerfile for a Node.js application that follows security best practices.

#Docker #Security #Node.js

Practice

DevOps Engineer • Coding • medium

Write a Python function to interact with the GCP Compute API to find and delete all unattached persistent disks older than 30 days.

#Python #GCP API #Cost Optimization #Automation

Practice

DevOps Engineer • Coding • hard

Implement a custom Kubernetes controller in Go that automatically labels pods with their respective Spotify squad owner based on a central metadata registry.

#Go #Kubernetes API #Controllers #Automation

Practice

DevOps Engineer • Coding • easy

Write a Bash script to check the HTTP status code of a list of Spotify API endpoints from a file and alert via Slack webhook if any return 5xx.

#Bash #cURL #Monitoring #Automation

Practice

DevOps Engineer • Coding • medium

Write a Python script to parse a massive Nginx access log file and return the top 10 IP addresses making requests to the `/stream` endpoint.

#Python #Log Parsing #Data Structures #Efficiency

Practice

DevOps Engineer • System Design • medium

Design an observability pipeline that ingests millions of log lines per second from Spotify clients and backend services.

#Observability #Data Pipelines #Kafka #Elasticsearch

Practice

DevOps Engineer • System Design • hard

Design a distributed rate-limiting system for the Spotify Web API to prevent abuse from third-party developers.

#Rate Limiting #Distributed Systems #Redis #API Gateway

Practice

DevOps Engineer • System Design • hard

How would you architect a disaster recovery strategy for Spotify's user metadata database (e.g., saved songs, followers) across multiple GCP regions?

#Disaster Recovery #GCP #Databases #High Availability

Practice

DevOps Engineer • System Design • hard

Design a system to securely distribute and rotate TLS certificates for thousands of internal microservices without service interruption.

#Security #TLS #Automation #PKI

Practice

DevOps Engineer • System Design • hard

Design the infrastructure for Spotify's Wrapped campaign. It causes massive, predictable traffic spikes globally over a few days.

#Scalability #GCP #Caching #Load Balancing #Capacity Planning

Practice

DevOps Engineer • System Design • hard

Design a global Content Delivery Network (CDN) caching strategy for Spotify's audio tracks to minimize latency and egress costs.

#CDN #Caching #Network Architecture #Cost Optimization

Practice

DevOps Engineer • System Design • medium

Design an automated rollback mechanism for a CI/CD pipeline when a canary deployment exhibits an elevated error rate.

#Automation #Rollbacks #Canary Deployments #Observability

Practice

DevOps Engineer • Technical • medium

What is your approach to managing database schema migrations in an automated CI/CD pipeline without causing downtime?

#CI/CD #Database Migrations #Zero-Downtime

Practice

DevOps Engineer • Technical • medium

What metrics would you monitor to ensure the health of a gRPC-based microservice?

#Monitoring #gRPC #Metrics #SRE

Practice

DevOps Engineer • Technical • hard

How do you optimize Docker images for a massive monorepo or a large set of polyglot microservices to reduce CI build times?

#Docker #Optimization #CI/CD #Build Systems

Practice

DevOps Engineer • Technical • medium

Explain how Horizontal Pod Autoscaler (HPA) works in Kubernetes. How would you scale based on custom metrics like active audio streams?

#Kubernetes #Autoscaling #Prometheus #Metrics

Practice

DevOps Engineer • Technical • hard

Discuss the trade-offs between using a managed service mesh (like Istio or Anthos) versus a simpler ingress controller setup for internal service-to-service communication.

#Service Mesh #Istio #Kubernetes #Architecture

Practice

DevOps Engineer • Technical • medium

How do you ensure infrastructure cost optimization in a cloud environment where developers have the autonomy to spin up resources?

#FinOps #GCP #Cost Optimization #Governance

Practice

DevOps Engineer • Technical • hard

How would you implement network policies in a multi-tenant Kubernetes cluster to ensure squads cannot access each other's databases?

#Kubernetes #Network Policies #Security #Multi-tenancy

Practice

DevOps Engineer • Technical • medium

Explain the concept of GitOps. How would you implement it using ArgoCD for a fleet of Kubernetes clusters?

#GitOps #ArgoCD #Kubernetes #Continuous Deployment

Practice

DevOps Engineer • Technical • hard

Spotify uses Backstage extensively. How would you design a CI/CD pipeline template in Backstage that standardizes deployments but allows squads flexibility?

#Backstage #Developer Experience #CI/CD #Standardization

Practice

DevOps Engineer • Technical • medium

Explain how you would implement zero-downtime deployments for a stateful microservice handling user playlists.

#Kubernetes #StatefulSets #Zero-Downtime #Database Migrations

Practice

DevOps Engineer • Technical • easy

What is the difference between a Kubernetes Deployment and a StatefulSet? When would you use each in a streaming platform?

#Kubernetes #Deployments #StatefulSets

Practice

DevOps Engineer • Technical • hard

How do you manage Terraform state files for hundreds of microservices managed by dozens of different squads?

#Terraform #State Management #Collaboration #GCP

Practice

DevOps Engineer • Technical • medium

Walk me through how you would troubleshoot a sudden spike in 502 Bad Gateway errors in a GKE cluster.

#Kubernetes #GKE #Networking #Debugging

Practice

DevOps Engineer • Technical • medium

How do you handle secrets management in a multi-cluster Kubernetes environment on GCP, specifically for autonomous squads?

#Kubernetes #GCP #Secrets Management #Security

Practice

Frontend Engineer • Behavioral • medium

Describe a time when a deployment you were involved in broke production. What was your role in the incident and what did you learn?

#Incident Management #Post-mortem #Accountability #Resilience

Practice

Frontend Engineer • Behavioral • easy

Why Spotify? What specific aspects of our engineering culture, product, or tech stack draw you to this role?

#Motivation #Company Knowledge #Passion #Alignment

Practice

Frontend Engineer • Behavioral • easy

Tell me about a time you mentored a junior engineer or helped level up your team's technical skills.

#Mentorship #Team Building #Communication #Knowledge Sharing

Practice

Frontend Engineer • Behavioral • medium

Give an example of how you have advocated for web accessibility within your team or organization.

#Accessibility #Advocacy #Empathy #Mentorship

Practice

Frontend Engineer • Behavioral • medium

Tell me about a time you identified a performance bottleneck in a web application and how you fixed it.

#Performance #Problem Solving #Impact #Profiling

Practice

Frontend Engineer • Behavioral • hard

Spotify operates in autonomous squads. Tell me about a time you had to take ownership of a project with highly ambiguous requirements.

#Ownership #Ambiguity #Autonomy #Proactivity

Practice

Frontend Engineer • Behavioral • medium

Describe a situation where you had to balance shipping a feature quickly versus paying down technical debt.

#Prioritization #Technical Debt #Decision Making #Agile

Practice

Frontend Engineer • Behavioral • medium

Tell me about a time you disagreed with a product manager or designer about a feature implementation. How did you resolve it?

#Communication #Conflict Resolution #Collaboration #Empathy

Practice

Frontend Engineer • Coding • hard

Build a virtualized list component from scratch to render a user's 'Liked Songs' playlist containing 10,000 tracks without performance degradation.

#React #Virtualization #DOM Manipulation #Performance

Practice

Frontend Engineer • Coding • easy

Write a utility function to parse a Spotify URI (e.g., `spotify:track:12345`) and extract the entity type and ID.

#String Manipulation #Regex #JavaScript

Practice

Frontend Engineer • Coding • medium

Implement a deep clone function in JavaScript without using `JSON.parse(JSON.stringify())` or `structuredClone`.

#JavaScript #Recursion #Objects #Memory Management

Practice

Frontend Engineer • Coding • medium

Build a 'Like' (heart) button component that optimistically updates the UI instantly, but rolls back the state if the API request fails.

#React #Asynchronous JS #Error Handling #Optimistic UI

Practice

Frontend Engineer • Coding • medium

Write a function to merge overlapping intervals representing a user's listening sessions to calculate total unique listening time.

#Arrays #Sorting #Time Complexity

Practice

Frontend Engineer • Coding • medium

Implement a custom React hook `useDebounce` for the Spotify search bar to limit API calls while a user types.

#React #Custom Hooks #Performance #Asynchronous JavaScript

Practice

Frontend Engineer • Coding • medium

Implement an LRU (Least Recently Used) Cache class to store recently searched artists on the client side.

#Data Structures #Caching #JavaScript #Map

Practice

Frontend Engineer • Coding • medium

Create an interactive star rating component (1-5 stars) that supports half-stars, hover states, and keyboard navigation.

#Accessibility #React #DOM #CSS

Practice

Frontend Engineer • Coding • easy

Write a function to flatten a deeply nested array of playlist tracks into a single-level array.

#JavaScript #Recursion #Arrays

Practice

Frontend Engineer • Coding • medium

Implement an audio progress bar component that updates smoothly during playback without causing full page re-renders.

#React #State Management #Performance #Web Audio API

Practice

Frontend Engineer • System Design • hard

Design the frontend architecture for the Spotify Web Player.

#Architecture #State Management #Media Playback #Component Trees

Practice

Frontend Engineer • System Design • medium

Design a scalable design system and component library for Spotify's internal tools (e.g., Backstage).

#Design Systems #Accessibility #Reusability #CSS Architecture

Practice

Frontend Engineer • System Design • hard

Architect a podcast player that remembers playback position across different devices (web, mobile, desktop).

#State Management #Cross-device Sync #Media API #Polling vs Sockets

Practice

Frontend Engineer • System Design • medium

Design a system to handle internationalization (i18n) and localization (l10n) across the Spotify web client.

#i18n #Architecture #React #Performance

Practice

Frontend Engineer • System Design • medium

Design the search autocomplete experience for Spotify, handling millions of potential queries.

#Debouncing #Caching #Network Optimization #Accessibility

Practice

Frontend Engineer • System Design • medium

How would you design the frontend telemetry and error logging system for a high-traffic app like Spotify?

#Observability #Error Handling #Performance #Analytics

Practice

Frontend Engineer • System Design • hard

Design a micro-frontend architecture for the Spotify desktop application to allow different squads to deploy independently.

#Micro-frontends #Webpack Module Federation #Architecture #CI/CD

Practice

Frontend Engineer • System Design • hard

Design an offline mode for the Spotify Web App using Service Workers and IndexedDB.

#PWA #Offline Storage #Service Workers #Web APIs

Practice

Frontend Engineer • System Design • medium

How would you architect the Spotify Home Feed to support personalized, dynamic content modules that load quickly?

#Component Design #API Integration #Performance #Lazy Loading

Practice

Frontend Engineer • System Design • hard

Design a collaborative playlist feature where multiple users can add, remove, and reorder songs in real-time.

#WebSockets #Real-time #State Synchronization #Conflict Resolution

Practice

Frontend Engineer • Technical • medium

How does React's reconciliation algorithm work, and why are keys important when rendering a list of tracks?

#React #Virtual DOM #Performance #Diffing Algorithm

Practice

Frontend Engineer • Technical • medium

Explain the JavaScript Event Loop and how it handles Promises (Microtasks) versus `setTimeout` (Macrotasks).

#JavaScript #Concurrency #Event Loop #Asynchronous JS

Practice

Frontend Engineer • Technical • hard

Describe how you would optimize the Core Web Vitals (LCP, CLS, INP) for the Spotify web landing page.

#Web Vitals #Optimization #CSS #Network

Practice

Frontend Engineer • Technical • medium

What are the accessibility (a11y) considerations when building custom audio player controls?

#a11y #ARIA #Keyboard Navigation #Screen Readers

Practice

Frontend Engineer • Technical • medium

Explain the differences between Client-Side Rendering (CSR), Server-Side Rendering (SSR), and Static Site Generation (SSG). Which would you use for a public artist profile page?

#Rendering Patterns #Next.js #SEO #Performance

Practice

Frontend Engineer • Technical • medium

How do you manage global state in a large React application? Compare Context API, Redux, and Zustand.

#React #Redux #Architecture #Context API

Practice

Frontend Engineer • Technical • medium

What is Cross-Site Scripting (XSS) and how would you prevent it when rendering user-generated playlist descriptions?

#Web Security #XSS #Sanitization #React

Practice

Full Stack Engineer • Behavioral • easy

Describe a time you mentored a junior engineer. How did you adapt your communication style to help them succeed?

#Mentorship #Communication

Practice

Full Stack Engineer • Behavioral • hard

Spotify squads are highly autonomous. Tell me about a time you had to balance technical debt with the pressure to deliver new features quickly.

#Technical Debt #Prioritization

Practice

Full Stack Engineer • Behavioral • medium

Tell me about a time you had a technical disagreement with a Product Manager or Designer. How did you resolve it?

#Communication #Conflict Resolution

Practice

Full Stack Engineer • Behavioral • medium

Tell me about a time you caused a production incident. What was the impact, and what were your learnings and follow-up actions?

#Accountability #Post-mortems

Practice

Full Stack Engineer • Behavioral • easy

Why do you want to work at Spotify? What is your favorite feature, and from a full-stack perspective, how would you improve it?

#Product Sense #Passion

Practice

Full Stack Engineer • Behavioral • medium

Tell me about a time you used data or metrics to drive a technical architectural decision.

#Data-Driven #Architecture

Practice

Full Stack Engineer • Behavioral • medium

Describe a time you took ownership of a completely ambiguous problem. How did you break it down and deliver a solution?

#Ownership #Ambiguity #Agile

Practice

Full Stack Engineer • Coding • hard

Write a function to merge K sorted arrays. Imagine each array represents a sorted list of timestamps when a user listened to a podcast.

#Heap #Divide and Conquer

Practice

Full Stack Engineer • Coding • easy

Implement a debounce function from scratch in JavaScript. Explain how it would be used in the Spotify search bar to limit API calls.

#JavaScript #Closures #DOM

Practice

Full Stack Engineer • Coding • easy

Implement a function to flatten a deeply nested array of playlist folders into a single flat array.

#Recursion #Arrays #JavaScript

Practice

Full Stack Engineer • Coding • hard

Implement an auto-complete search feature. What data structures would you use to ensure sub-millisecond response times?

#Trie #Search

Practice

Full Stack Engineer • Coding • easy

Given an array of song durations and a target playlist duration, find two songs whose total duration exactly matches the target.

#Hash Map #Arrays

Practice

Full Stack Engineer • Coding • easy

Given an array of integers representing daily active users over time, find the maximum profit you could make by buying and selling Spotify stock (Best Time to Buy and Sell Stock).

#Arrays #Dynamic Programming

Practice

Full Stack Engineer • Coding • easy

Write a function to determine if a given string is a valid palindrome, considering only alphanumeric characters. Useful for validating certain user inputs.

#Strings #Two Pointers

Practice

Full Stack Engineer • Coding • medium

Write a React component that fetches and displays a list of albums. Include loading states, error handling, and pagination.

#React #Hooks #API Integration

Practice

Full Stack Engineer • Coding • medium

Given a string representing a user's listening history (e.g., 'ABCBAC'), find the length of the longest substring without repeating characters.

#Sliding Window #Strings

Practice

Full Stack Engineer • Coding • medium

Given a binary tree representing a hierarchical genre classification, write a function to find the lowest common ancestor of two genres.

#Trees #DFS

Practice

Full Stack Engineer • Coding • medium

Write an algorithm to find the 'k' closest songs to a given song based on a similarity score.

#Heap #Sorting

Practice

Full Stack Engineer • Coding • medium

Implement an LRU Cache. This is often used in our mobile and web clients to cache recently played songs or album art.

#Data Structures #Linked List #Hash Map

Practice

Full Stack Engineer • System Design • hard

Design a system for uploading, processing, and distributing audio files from artists to listeners.

#CDN #Transcoding #Storage

Practice

Full Stack Engineer • System Design • medium

Design a notification system to alert users when a new podcast episode from their subscribed shows is released.

#Pub/Sub #Push Notifications #Microservices

Practice

Full Stack Engineer • System Design • medium

Design a rate limiter for Spotify's public Web API to prevent abuse from third-party developers.

#Rate Limiting #Redis #API Gateway

Practice

Full Stack Engineer • System Design • hard

Design a hit counter for song plays. It needs to handle billions of increments per day and provide accurate counts for artists.

#Distributed Systems #Aggregation #Redis

Practice

Full Stack Engineer • System Design • hard

Design a real-time collaborative playlist feature where multiple users can add, remove, and reorder tracks simultaneously.

#WebSockets #CRDTs #Concurrency

Practice

Full Stack Engineer • System Design • hard

Design the architecture for Spotify Wrapped. How would you handle the massive surge in traffic and data aggregation at the end of the year?

#Batch Processing #Big Data #Scalability

Practice

Full Stack Engineer • System Design • hard

Design a system to track the top K most played songs globally in real-time.

#Streaming #Top K #Kafka #Redis

Practice

Full Stack Engineer • System Design • hard

Design the 'Discover Weekly' delivery system. You don't need to design the ML model, but design how the generated playlists are stored and served to millions of users every Monday.

#Caching #Batch Processing #Scalability

Practice

Full Stack Engineer • Technical • medium

How do you optimize the performance of a React application? Discuss specific techniques you would use for a heavy UI like the Spotify Web Player.

#React #Performance #Memoization

Practice

Full Stack Engineer • Technical • medium

What is Cross-Origin Resource Sharing (CORS)? How would you configure it securely for a Spotify embed widget placed on external blogs?

#CORS #Security #HTTP

Practice

Full Stack Engineer • Technical • medium

How would you design the database schema for a music streaming service? Include tables for Users, Songs, Artists, Albums, and Playlists.

#Database Design #Normalization #SQL

Practice

Full Stack Engineer • Technical • easy

Explain CSS specificity. How would you architect the CSS for a large-scale application to avoid styling conflicts?

#CSS #Architecture #BEM

Practice

Full Stack Engineer • Technical • medium

Explain the differences between GraphQL and REST. Why might Spotify choose GraphQL for its web and mobile clients?

#GraphQL #REST #Network

Practice

Full Stack Engineer • Technical • medium

How would you implement state management in a complex React application like Spotify Web? Compare Redux, Context API, and Zustand.

#React #State Management

Practice

Full Stack Engineer • Technical • medium

Explain how the JavaScript Event Loop works. How does it handle asynchronous operations like fetching audio chunks?

#JavaScript #Event Loop #Async

Practice

Full Stack Engineer • Technical • medium

How does JWT authentication work? Describe how you would implement secure authentication between Spotify's frontend and microservices.

#Authentication #JWT #Microservices

Practice

Machine Learning Engineer • Behavioral • easy

Spotify values 'sincere collaboration.' Give an example of how you embody this principle in your day-to-day work.

#Teamwork #Company Values #Mentorship

Practice

Machine Learning Engineer • Behavioral • easy

How do you stay updated with the latest Machine Learning research, and how do you decide what is worth implementing in production?

#Continuous Learning #Pragmatism #Research vs Production

Practice

Machine Learning Engineer • Behavioral • medium

Tell me about a time you had to balance technical debt with the need to deliver a machine learning feature quickly.

#Project Management #Technical Debt #Decision Making

Practice

Machine Learning Engineer • Behavioral • medium

Tell me about a time you disagreed with a Product Manager regarding the launch of a new machine learning feature.

#Conflict Resolution #Communication #Cross-functional Collaboration

Practice

Machine Learning Engineer • Behavioral • medium

Describe a time a machine learning model you deployed degraded in production. How did you detect it and handle it?

#Model Monitoring #Incident Response #Continuous Improvement

Practice

Machine Learning Engineer • Coding • medium

Given a log of user listening history, write a function to return the top K most frequently played artists.

#Heaps #Hash Maps #Data Structures

Practice

Machine Learning Engineer • Coding • medium

Implement a rate limiter for the Spotify Web API to prevent abuse.

#System Design #Concurrency #Data Structures

Practice

Machine Learning Engineer • Coding • hard

Write an algorithm to merge K sorted lists of top tracks from different geographical regions into a single global top tracks list.

#Linked Lists #Heaps #Divide and Conquer

Practice

Machine Learning Engineer • Coding • easy

Given two strings representing song titles, write a function to determine if they are anagrams of each other (useful for fuzzy search matching).

#Strings #Hash Maps #Sorting

Practice

Machine Learning Engineer • Coding • hard

Given a string representing a user's listening session (where characters represent genres), find the shortest contiguous substring that contains at least one of every genre in a given target set.

#Sliding Window #Hash Maps #Strings

Practice

Machine Learning Engineer • Coding • medium

Given a string without spaces (e.g., a concatenated search query) and a dictionary of valid artist names, determine if the string can be segmented into a space-separated sequence of valid artists.

#Dynamic Programming #Strings

Practice

Machine Learning Engineer • Coding • medium

Given an array of song durations and a maximum time limit, find the longest contiguous sub-array of songs that fit within the time limit.

#Sliding Window #Arrays

Practice

Machine Learning Engineer • System Design • hard

Design Spotify's search autocomplete system. It needs to be highly responsive and handle typos.

#Search #Tries #Distributed Systems #Caching

Practice

Machine Learning Engineer • System Design • hard

Design a real-time recommendation system for a 'Listening Party' feature (like Spotify Jams) where multiple users listen together.

#Real-time Systems #Group Recommendation #Concurrency

Practice

Machine Learning Engineer • System Design • hard

Design a podcast recommendation engine. How does this differ from recommending music?

#Recommendation Systems #NLP #User Intent

Practice

Machine Learning Engineer • System Design • hard

Design an ad-targeting system for Spotify's free tier users that maximizes revenue while minimizing user churn.

#Ad Tech #Prediction Models #Optimization

Practice

Machine Learning Engineer • System Design • hard

Design a system to generate personalized 'Year in Review' (Spotify Wrapped) stats for hundreds of millions of users.

#Batch Processing #Data Warehousing #Scalability

Practice

Machine Learning Engineer • System Design • hard

Design the architecture for Spotify's Discover Weekly playlist. How would you generate 30 personalized tracks for millions of users every Monday?

#Recommendation Systems #Batch Processing #Scalability #Collaborative Filtering

Practice

Machine Learning Engineer • System Design • medium

Design a scalable system to compute and update weekly artist charts (Top 50) globally and per country.

#Data Engineering #Stream Processing #Aggregation

Practice

Machine Learning Engineer • System Design • hard

Design a system to detect copyright infringement in newly uploaded podcasts in near real-time.

#Audio Processing #Streaming Architecture #Hashing

Practice

Machine Learning Engineer • Technical • medium

How would you design an A/B test for a new reinforcement learning-based playlist generator?

#A/B Testing #Experimentation #Statistics

Practice

Machine Learning Engineer • Technical • medium

How would you design a machine learning pipeline to automatically classify the mood (e.g., happy, sad, energetic) of a song?

#Classification #Audio Processing #NLP

Practice

Machine Learning Engineer • Technical • medium

Describe how you would build a churn prediction model for Spotify Premium subscribers.

#Classification #Feature Engineering #Survival Analysis

Practice

Machine Learning Engineer • Technical • medium

What is the role of negative sampling in training item embeddings, and how do you choose negative samples effectively?

#Negative Sampling #Embeddings #Loss Functions

Practice

Machine Learning Engineer • Technical • hard

How would you model sequential user listening behavior using Transformer architectures?

#Transformers #Sequential Recommendation #Deep Learning

Practice

Machine Learning Engineer • Technical • medium

Explain how you would mitigate popularity bias in a music recommendation system.

#Bias Mitigation #Recommendation Systems #Long-tail

Practice

Machine Learning Engineer • Technical • hard

How would you incorporate raw audio features (like spectrograms) into a deep learning recommendation model?

#Deep Learning #Audio Processing #CNNs

Practice

Machine Learning Engineer • Technical • medium

How does Approximate Nearest Neighbor (ANN) search work, and how would you use it for real-time song retrieval?

#Vector Databases #ANN #Retrieval

Practice

Machine Learning Engineer • Technical • hard

Explain the difference between pointwise, pairwise, and listwise approaches in Learning to Rank.

#Learning to Rank #Information Retrieval

Practice

Machine Learning Engineer • Technical • medium

Explain how you would generate embeddings for Spotify users and tracks using a Word2Vec-like approach.

#Embeddings #Representation Learning #Item2Vec

Practice

Machine Learning Engineer • Technical • medium

What metrics would you use to measure the success of a model designed to predict if a user will 'skip' a song?

#Classification #Metrics #Imbalanced Data

Practice

Machine Learning Engineer • Technical • hard

How would you use Multi-Armed Bandits to personalize the artwork shown for a playlist on the Spotify homepage?

#Reinforcement Learning #Multi-Armed Bandits #Personalization

Practice

Machine Learning Engineer • Technical • medium

How would you evaluate a new recommendation algorithm offline versus online?

#Evaluation Metrics #A/B Testing #Offline Evaluation

Practice

Machine Learning Engineer • Technical • medium

Explain the difference between Matrix Factorization and Two-Tower Neural Networks for recommendation. When would you choose one over the other?

#Deep Learning #Collaborative Filtering #Model Architecture

Practice

Machine Learning Engineer • Technical • medium

How would you address the cold start problem for a newly uploaded track by an unknown artist?

#Cold Start #Content-Based Filtering #Audio Features

Practice

Product Manager • Behavioral • medium

Tell me about a time you used data to change a senior leader's mind.

#Influence #Data-Driven #Communication

Practice

Product Manager • Behavioral • medium

Describe a time a product launch failed. What did you learn?

#Failure #Growth Mindset #Retrospectives

Practice

Product Manager • Behavioral • medium

Tell me about a time you had to align multiple squads with conflicting priorities.

#Stakeholder Management #Agile #Conflict Resolution

Practice

Product Manager • Behavioral • medium

Spotify values being 'Sincere.' Tell me about a time you had to deliver difficult feedback to a peer.

#Feedback #Communication #Emotional Intelligence

Practice

Product Manager • Behavioral • medium

Tell me about a time you had to pivot your product roadmap based on unexpected user data.

#Adaptability #Roadmapping #Data-Driven

Practice

Product Manager • Behavioral • medium

How do you manage stakeholders when engineering estimates a feature will take 3x longer than expected?

#Stakeholder Management #Agile #Negotiation

Practice

Product Manager • System Design • hard

Design the high-level architecture for Spotify's offline playback feature.

#Mobile Architecture #Offline Storage #DRM

Practice

Product Manager • System Design • hard

Design a system to handle the sudden spike in traffic when Taylor Swift drops a surprise album.

#Scalability #High Availability #Performance

Practice

Product Manager • System Design • hard

How would you design the system to track and calculate royalty payouts for artists in real-time?

#Data Pipelines #FinTech #Streaming Architecture

Practice

Product Manager • Technical • medium

How would you improve the Spotify Car Thing or the general in-car listening experience?

#Hardware/Software Integration #Contextual UX #Safety

Practice

Product Manager • Technical • medium

Design a feature to improve social sharing of music on Spotify.

#Product Sense #Social Features #Growth Loops

Practice

Product Manager • Technical • medium

How would you improve the podcast discovery experience for new users?

#Podcasts #User Experience #Discovery

Practice

Product Manager • Technical • hard

Premium subscriber churn increased by 5% last month. How do you investigate?

#Root Cause Analysis #Metrics #Retention

Practice

Product Manager • Technical • medium

Explain how Spotify's recommendation engine works at a high level to a non-technical stakeholder.

#Machine Learning #Recommendations #Communication

Practice

Product Manager • Technical • hard

Design a monetization feature for independent artists on Spotify.

#Creator Economy #Monetization #Two-Sided Marketplace

Practice

Product Manager • Technical • hard

Should Spotify acquire a major audiobook publisher? Why or why not?

#M&A #Market Expansion #Audiobooks

Practice

Product Manager • Technical • hard

Estimate the bandwidth costs for Spotify's free tier in the US.

#Guesstimation #Infrastructure #Unit Economics

Practice

Product Manager • Technical • medium

How do you balance the trade-off between ad load and user retention in the Free tier?

#A/B Testing #Monetization #Trade-offs

Practice

Product Manager • Technical • hard

We are considering increasing the price of Spotify Premium by $1. How would you evaluate this decision?

#Pricing #Business Strategy #LTV/CAC

Practice

Product Manager • Technical • medium

What metrics would you track to measure the success of Spotify Wrapped?

#Metrics #Growth #Viral Loops

Practice

Product Manager • Technical • hard

You run an A/B test for a new skip button placement. Engagement goes up, but ad revenue goes down. What do you do?

#A/B Testing #Trade-offs #Decision Making

Practice

Product Manager • Technical • medium

How would you integrate audiobooks into the existing Spotify app without cluttering the UI?

#UX/UI #Information Architecture #Audiobooks

Practice

Product Manager • Technical • medium

If DAU drops by 10% on iOS but remains flat on Android, how would you diagnose the issue?

#Root Cause Analysis #Mobile #Analytics

Practice

Product Manager • Technical • hard

Design a product for concert promoters to leverage Spotify listener data.

#B2B #Data Products #Live Events

Practice

Product Manager • Technical • hard

Why did Spotify invest so heavily in podcasts, and what should the next content vertical be?

#Content Strategy #Market Trends #Business Model

Practice

Product Manager • Technical • hard

How would you measure the cannibalization effect of podcasts on music listening time?

#Data Analysis #Cannibalization #Experimentation

Practice

Product Manager • Technical • medium

Spotify wants to introduce live audio rooms. How would you design the MVP?

#MVP #Live Audio #Product Scoping

Practice

Product Manager • Technical • medium

Design a feature for users who share an account but have vastly different music tastes.

#Personalization #Edge Cases #User Behavior

Practice

Product Manager • Technical • medium

Pitch a new subscription tier for Spotify. Who is the target audience?

#Monetization #Market Segmentation #Innovation

Practice

Product Manager • Technical • hard

What is the biggest threat to Spotify's business model in the next 5 years?

#Competitive Analysis #Risk Management #Industry Trends

Practice

Product Manager • Technical • medium

Set goals and metrics for the Spotify for Artists dashboard.

#B2B #Metrics #Goal Setting

Practice

Product Manager • Technical • medium

We want to launch a new lyrics translation feature. How do you design the experiment?

#Experimentation #Localization #A/B Testing

Practice

Product Manager • Technical • hard

How should Spotify position itself against YouTube Music in emerging markets?

#Emerging Markets #Competitive Strategy #Localization

Practice

Product Manager • Technical • easy

Imagine Spotify is building a feature for long-distance couples. What would it be?

#Innovation #Social #Empathy

Practice

Product Manager • Technical • hard

Should Spotify gate highly anticipated podcast episodes behind the Premium tier?

#Monetization #Content Strategy #User Acquisition

Practice

Software Engineer • Behavioral • medium

Tell me about a time you proactively identified a performance bottleneck in your system and improved it. What was the impact?

#Performance #Proactivity #Impact

Practice

Software Engineer • Behavioral • medium

How do you balance shipping features quickly (to meet squad goals) with paying down technical debt?

#Technical Debt #Prioritization #Agile

Practice

Software Engineer • Behavioral • medium

Describe a situation where you had to compromise on code quality or architecture to meet a strict business deadline.

#Trade-offs #Delivery #Pragmatism

Practice

Software Engineer • Behavioral • medium

Spotify is highly data-driven. Tell me about a time you had to pivot your technical approach or product feature because A/B test data or metrics contradicted your assumptions.

#Data-Driven #Adaptability #A/B Testing

Practice

Software Engineer • Behavioral • medium

Tell me about a time you had to collaborate across multiple squads or tribes to deliver a cross-functional feature.

#Cross-functional #Communication #Dependencies

Practice

Software Engineer • Behavioral • medium

Describe a time you strongly disagreed with a Product Manager regarding the technical feasibility or timeline of a feature. How did you resolve it?

#Conflict Resolution #Communication #Trade-offs

Practice

Software Engineer • Behavioral • easy

Tell me about a time you mentored a junior engineer or helped level up your team's engineering practices.

#Mentorship #Team Building #Code Reviews

Practice

Software Engineer • Behavioral • medium

Spotify squads operate with high autonomy. Tell me about a time you had to work on an ambiguous project with very little direction. How did you figure out what to build?

#Autonomy #Ambiguity #Initiative

Practice

Software Engineer • Behavioral • medium

We believe in 'failing fast' and learning from mistakes. Tell me about a significant technical failure you were responsible for, and what you learned from it.

#Failure #Growth Mindset #Post-mortems

Practice

Software Engineer • Behavioral • easy

Why do you want to work at Spotify? What is your favorite feature of the app, and from an engineering perspective, how would you improve it?

#Product Sense #Passion #Domain Knowledge

Practice

Software Engineer • Coding • hard

Spotify users often complain that 'random shuffle' doesn't feel random if it plays the same artist back-to-back. Design an algorithm to shuffle a playlist of songs such that songs by the same artist are spaced out as evenly as possible.

#Arrays #Greedy #Heaps #Fisher-Yates

Practice

Software Engineer • Coding • medium

Given a stream of song IDs listened to by users, write a function to return the top K most played songs over a given time window.

#Heaps #Hash Maps #Streaming Data

Practice

Software Engineer • Coding • hard

Calculate the minimum number of skips required to reach a target song in a circular queue, given that the user can skip forward by 1, skip forward by 3, or go back by 1.

#Dynamic Programming #BFS

Practice

Software Engineer • Coding • medium

Find the longest consecutive listening session from a log of user play events. Each event has a start_time and end_time. A session is continuous if the gap between songs is less than 5 seconds.

#Intervals #Sorting #Arrays

Practice

Software Engineer • Coding • medium

Given a graph of artists where edges represent 'Fans also like' relationships, write a function to find the shortest degree of separation between two given artists.

#Graphs #BFS #Shortest Path

Practice

Software Engineer • Coding • medium

Implement a search autocomplete data structure for song titles. Given a prefix, return the top 3 most popular song titles that start with that prefix.

#Trie #DFS #Sorting

Practice

Software Engineer • Coding • medium

Design a rate limiter for the Spotify Web API to prevent third-party applications from exceeding their quota of 10,000 requests per minute.

#Sliding Window #Concurrency #System Design

Practice

Software Engineer • Coding • easy

Given an array of integers representing the duration of songs in a user's queue, and a target commute time, find exactly two songs that add up to the exact commute time minus 30 seconds (for a crossfade).

#Hash Maps #Two Pointers

Practice

Software Engineer • Coding • hard

You are given K sorted playlists (arrays of song IDs sorted by release date). Merge them into a single sorted playlist.

#Divide and Conquer #Heaps #Linked Lists

Practice

Software Engineer • Coding • medium

Implement an LRU (Least Recently Used) Cache for a mobile client storing downloaded album covers. The cache must support get() and put() in O(1) time.

#Linked Lists #Hash Maps #Design

Practice

Software Engineer • System Design • hard

Design an Audio Ad delivery system for free-tier users. The system must target ads based on user demographics and track impressions accurately for billing.

#Ad Tech #Tracking #Low Latency #Data Pipelines

Practice

Software Engineer • System Design • medium

Design the 'Download for Offline' feature for the mobile app. How do you handle synchronization, storage limits, and DRM (Digital Rights Management)?

#Mobile Architecture #Syncing #Security #Storage

Practice

Software Engineer • System Design • hard

Design Spotify's Home Feed. The feed needs to serve personalized recommendations (mixes, new releases, podcasts) with low latency.

#Microservices #Machine Learning #Caching #API Gateway

Practice

Software Engineer • System Design • medium

Design the Collaborative Playlist feature. Multiple users can add, remove, and reorder tracks simultaneously. How do you resolve conflicts and ensure all clients reflect the same state?

#Concurrency #WebSockets #CRDTs #Event Sourcing

Practice

Software Engineer • System Design • hard

Design the backend architecture for Spotify Wrapped. How would you aggregate a year's worth of listening data for hundreds of millions of users and serve it simultaneously on December 1st?

#Batch Processing #MapReduce #Caching #Scalability

Practice

Software Engineer • System Design • hard

Design a highly scalable system to track song play counts in real-time. The system must handle billions of events per day and update the 'popular tracks' UI with sub-second latency.

#Stream Processing #Kafka #NoSQL #Event-Driven

Practice

Software Engineer • System Design • medium

Design an integration with a third-party ticketing API (like Ticketmaster) to show live concert tickets on artist pages. The third-party API is slow and heavily rate-limited.

#API Integration #Caching #Cron Jobs #Resilience

Practice

Software Engineer • System Design • hard

Design a distributed audio transcoding pipeline. When a label uploads a high-res FLAC file, it needs to be converted into various formats (Ogg Vorbis, AAC) and bitrates.

#Distributed Systems #Message Queues #Blob Storage #Worker Nodes

Practice

Software Engineer • System Design • medium

Design the backend for Spotify's search autocomplete. It must be extremely fast and handle typos.

#Elasticsearch #Caching #Trie #CDN

Practice

Software Engineer • System Design • medium

Design a notification system to alert users when a new episode of a podcast they follow is released.

#Pub/Sub #Push Notifications #Fan-out

Practice

Software Engineer • Technical • medium

How would you handle concurrent updates to a user's playlist if they are modifying it simultaneously from their phone and their desktop app?

#Concurrency #Databases #Locking

Practice

Software Engineer • Technical • medium

What happens from a networking and backend perspective when a user presses 'Play' on a track in the Spotify app?

#Networking #DNS #CDN #DRM

Practice

Software Engineer • Technical • hard

Explain how Garbage Collection works in Java (or your primary language). How would you tune it for a high-throughput, low-latency microservice serving playlist metadata?

#JVM #Garbage Collection #Performance Tuning

Practice

Software Engineer • Technical • medium

Explain the difference between batch processing and stream processing. In the context of calculating artist royalties, which would you use and why?

#Data Engineering #Batch vs Stream #Architecture

Practice

Software Engineer • Technical • medium

Write a SQL query to find the top 3 most listened to artists per country in the last 30 days from a 'streams' table.

#Window Functions #Aggregations #Date Functions

Practice

Spotify

The Interview Loop

Recruiter Screen (30 min)

Technical Loop (3-4 Rounds)

Interview Question Bank

Describe a project where you had to balance paying down technical debt with delivering new product features. How did you prioritize?

Tell me about a time you strongly disagreed with your squad on a technical approach. How did you resolve the disagreement?

Spotify embraces a 'fail fast' culture. Tell me about a time you built something that completely failed or was scrapped. What did you learn?

Spotify is highly data-driven. Give an example of a time you used data or metrics to drive a significant architectural or technical decision.

Tell me about a time you had to learn a completely new technology or framework on the fly to solve a critical business problem.

Spotify values 'sincere collaboration'. Give an example of a time you had to work with a difficult stakeholder or team member. How did you build trust?

Describe a production outage you caused or were involved in resolving. What was the root cause, and what was the outcome of the post-mortem?

Tell me about a time you had to push back on a Product Manager's timeline because of technical constraints. How did you handle it?

Implement a rate limiter for the Spotify Web API. The rate limiter should allow a maximum of 100 requests per minute per user ID.

Spotify users can organize playlists into folders. Given a nested folder structure, serialize it into a string and deserialize it back into the original structure.

Given a user's listening history as a string of song genres, find the length of the longest contiguous listening session that contains at most two distinct genres.

Design a hit counter that records the number of times a specific podcast episode was played in the past 5 minutes.

Given an array of song durations, find two songs that add up to exactly the length of a given commute time minus 30 seconds (for a crossfade).

Design an LRU (Least Recently Used) cache to store a user's recently played tracks. The cache should support get and put operations in O(1) time.

Given a stream of song IDs played by users, write a function to return the top K most frequently played songs in the last 24 hours.

You are given K sorted playlists, where each playlist is a list of song objects sorted by release date. Merge all playlists into one single sorted playlist.

Write an algorithm to simulate Spotify's 'Shuffle' feature. Given a playlist of N songs, ensure that every song has an equal probability of being chosen, and no song is played twice until all have been played.

Find the shortest path between two artists based on their collaborations. You are given an API that returns a list of collaborated artists for a given artist ID.

Design a collaborative playlist feature where multiple users can add, remove, and reorder tracks in real-time.

Design Spotify's core audio streaming service. How do you ensure low latency playback and handle buffering?

Design the backend for Spotify Wrapped. How would you aggregate a year's worth of listening data for hundreds of millions of users?

Design a podcast subscription system. Users should receive push notifications within 1 minute of a new episode being published by a creator they follow.

Design Spotify's 'Friend Activity' feed. How do you display what your friends are currently listening to with minimal delay?

Design Spotify Jam (real-time listening parties). Multiple users in different locations need perfectly synchronized playback.

Design the search autocomplete system for Spotify. It needs to return results for tracks, artists, and albums in under 50ms.

Design a system to track song plays and calculate royalty payouts to artists. The system must be highly accurate and auditable.

Design a distributed cache to store user profile data. How do you handle cache invalidation and hot keys?

Design the serving layer for Spotify's Home screen recommendation engine. How do you serve personalized content to 500M+ users efficiently?

Write a SQL query to find the top 3 artists by total listening time in the last 30 days, given tables for 'users', 'plays', and 'tracks'.

A user reports that a specific playlist is taking 5 seconds to load. Explain how you would use distributed tracing to diagnose the bottleneck across 50+ microservices.

Design the database schema for a user's 'Your Library' feature, which includes saved tracks, albums, and podcasts. How do you optimize for fast retrieval?

Compare gRPC and REST. Why might Spotify choose gRPC for communication between internal backend microservices?

Spotify uses Kafka heavily for event streaming. How do you ensure exactly-once processing for song play events to prevent overpaying royalties?

Explain how you would migrate a legacy monolithic service to a microservices architecture without causing downtime for Spotify users.

How would you handle a sudden, massive spike in traffic when a major artist (e.g., Taylor Swift) drops a highly anticipated album at midnight?

Tell me about a time you optimized a process or pipeline to save costs on cloud infrastructure.

Describe a situation where a critical data pipeline failed in production. How did you troubleshoot it, and what did you do to prevent it from happening again?

Tell me about a time you had to learn a completely new technology or framework on the fly to deliver a project on time.

Give an example of how you mentored a junior engineer or shared knowledge across teams to improve overall engineering standards.

Tell me about a time you had to push back on a Product Manager or Data Scientist regarding a data engineering constraint or unrealistic deadline.

Implement a rate limiter for a Spotify API endpoint that allows a maximum of 100 requests per minute per user.

Given a playlist of track durations, find if there are two tracks that add up to exactly a target duration (Two Sum variant).

Implement an LRU Cache to store a user's most recently played tracks.

Write a script to parse a nested JSON payload representing a user's playlist and extract all unique genres, counting their frequencies.

Write a Python function to find the top K most frequently played songs for a given user from a list of stream logs.

Given a list of user listening sessions with start and end timestamps, write a function to merge all overlapping sessions to calculate the total unique listening time.

Design a sliding window algorithm to count the number of streams a track received in the last 5 minutes, updating in real-time.

Write a function to find the longest streak of consecutive days a user listened to a specific podcast.

Given a massive JSON log file of track events that cannot fit into memory, write a Python script to filter out skipped tracks and aggregate the total play duration per artist.

Design a system to ingest, validate, and process 10 billion daily stream events from mobile clients.

Design a dimensional data model (Star Schema) to support the backend analytics for Spotify Wrapped.

Design the end-to-end data pipeline for Spotify Wrapped. How do you process a year's worth of data for hundreds of millions of users?

Design a real-time dashboard pipeline showing the top trending songs globally right now.

How would you migrate a massive legacy on-prem Hadoop pipeline to GCP Dataflow and BigQuery with zero downtime?

Design an A/B testing data pipeline to evaluate a new home screen recommendation algorithm.

Design a pipeline to calculate royalty payments to artists at the end of the month based on complex, varying contract rules.

Architect a system to detect fraudulent streams (e.g., bot farms looping a 31-second track) in near real-time.

Write a SQL query to find the median listening time per user without using built-in median functions.

How do you handle late-arriving stream events in BigQuery when calculating daily aggregations?

Write a query to identify 'bouncing' users—users who started a playlist, listened to less than 10 seconds of the first track, and did not play another track within 1 hour.

What is the difference between a broadcast join and a shuffle join in Spark or Scio? When would you use each?

Explain the difference between Apache Beam's Windowing and Triggers. Give a use case for each.

In a distributed join, how do you handle data skew? For example, joining a 'Streams' table with an 'Artists' table where Taylor Swift has 100x more streams than others.

Explain how Kafka consumer groups work and what happens during a partition rebalance.

Write a SQL query to calculate the Month-over-Month retention rate of Spotify Premium users.

Write a SQL query to identify the top 3 most skipped tracks (played for less than 30 seconds) in the last 24 hours.

Write a SQL query to find users who listened to the exact same song more than 10 times in a single calendar day.

Write a SQL query to calculate the 7-day rolling average of streams for each artist over the past month.

How do you ensure data quality and idempotency in an Apache Airflow DAG?

How do you optimize a slow-running BigQuery query that processes terabytes of data and frequently hits resource limits?

How would you explain a p-value to a non-technical product manager?

You are running an A/B test for a new recommendation algorithm, but the p-value is 0.06. Stakeholders want to launch it anyway because the UI looks better. What do you do?

Tell me about a time your model or analysis failed in production. What did you learn?

Describe a project where you had to work with messy, unstructured data. How did you handle it?

Spotify values being playful and sincere. Can you share an example of how you brought these traits to your previous team?