Spotify
Music streaming platform using ML for personalization and recommendation.
4 Rounds
~21 Days
Hard
The Interview Loop
Recruiter Screen (30 min)
Standard fit check, behavioral questions, and resume overview.
Technical Loop (3-4 Rounds)
Deep dive into domain knowledge, coding, and system design.
Interview Question Bank
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
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
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
Backend Engineer
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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
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
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
Backend Engineer
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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
Backend Engineer
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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
Backend Engineer
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Coding
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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
Backend Engineer
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Coding
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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
Backend Engineer
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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
Backend Engineer
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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
Backend Engineer
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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
Backend Engineer
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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
Backend Engineer
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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
Backend Engineer
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Coding
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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
Backend Engineer
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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
Backend Engineer
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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
Backend Engineer
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System Design
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hard
Design Spotify's core audio streaming service. How do you ensure low latency playback and handle buffering?
#CDN
#Streaming Protocols
#Caching
#Network
Backend Engineer
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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
Backend Engineer
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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
Backend Engineer
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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
Backend Engineer
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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
Backend Engineer
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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
Backend Engineer
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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
Backend Engineer
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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
Backend Engineer
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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
Backend Engineer
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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
Backend Engineer
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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
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
Backend Engineer
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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
Backend Engineer
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Technical
•
medium
Compare gRPC and REST. Why might Spotify choose gRPC for communication between internal backend microservices?
#gRPC
#REST
#Protobuf
#Networking
Backend Engineer
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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
Backend Engineer
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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
Backend Engineer
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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
Difficulty Radar
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Senior EngineerFocuses on core competencies, system constraints, and clear communication.
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Think Out Loud
Always explain your thought process before writing code or drawing architecture.