Professional networking platform with rich data and ML-driven recommendations.
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
Cloud Engineer
•
System Design
•
hard
LinkedIn is migrating a massive on-premise monolithic relational database to a distributed NoSQL database in Azure. Walk me through your migration strategy with zero downtime.
#Cloud Migration
#Databases
#Data Consistency
Cloud Engineer
•
System Design
•
hard
Design a system to track and process billions of 'Profile Views' per day. Users need to see an accurate count of who viewed their profile in near real-time.
#Stream Processing
#Kafka
#NoSQL
#Aggregation
Cloud Engineer
•
System Design
•
medium
Design a scalable image processing service for LinkedIn profile pictures. It needs to handle uploads, generate multiple thumbnails, and serve them globally.
#Blob Storage
#Event-Driven Architecture
#CDN
Cloud Engineer
•
System Design
•
hard
Design a distributed cache system. How do you handle cache eviction, hot keys, and node failures?
#Caching
#Consistent Hashing
#Distributed Systems
Cloud Engineer
•
System Design
•
hard
Design a Disaster Recovery (DR) strategy for a Tier-1 LinkedIn service hosted in Azure. What are your RTO and RPO targets, and how do you achieve them?
#Disaster Recovery
#High Availability
#Azure
Cloud Engineer
•
System Design
•
hard
Design LinkedIn's news feed architecture. Focus on how you would generate and serve the feed to millions of concurrent users with low latency.
#Microservices
#Caching
#Fan-out
#Databases
Cloud Engineer
•
System Design
•
hard
Design a global load balancing and traffic routing strategy for LinkedIn to ensure high availability across multiple geographic regions.
#Load Balancing
#DNS
#Anycast
#CDN
Cloud Engineer
•
System Design
•
medium
Design a distributed logging system capable of ingesting, storing, and querying petabytes of log data per day from LinkedIn's microservices.
#Logging
#Kafka
#Elasticsearch
#Data Pipeline
Cloud Engineer
•
System Design
•
hard
Design an alerting and monitoring system for a cloud environment with 100,000 virtual machines. How do you handle metric aggregation and prevent alert fatigue?
#Monitoring
#Time-Series Database
#Distributed Systems
Cloud Engineer
•
System Design
•
medium
Design a URL shortener service similar to LinkedIn's lnkd.in. How do you ensure uniqueness, handle high read throughput, and manage expired links?
#API Design
#Database Schema
#Caching
#Hashing
Data Engineer
•
System Design
•
medium
Design a data warehouse schema for LinkedIn Learning. We need to track user video consumption, course completions, and instructor payouts.
#Dimensional Modeling
#Star Schema
#Data Warehousing
Data Engineer
•
System Design
•
medium
How would you design a scalable ETL pipeline to sync relational data from MySQL (e.g., user profile updates) to a data lake (Hadoop/Iceberg) for offline analytics?
#Change Data Capture
#ETL
#Data Lake
#Apache Iceberg
Data Engineer
•
System Design
•
hard
Design a real-time dashboard for LinkedIn Job Postings analytics that allows recruiters to see how many impressions, clicks, and applies their job posts received in the last 24 hours.
#OLAP
#Real-time Analytics
#Kafka
#Apache Pinot
Data Engineer
•
System Design
•
hard
Design a data pipeline to power the 'Who viewed your profile' feature. How do you handle the massive scale of profile views and ensure near real-time updates?
#Stream Processing
#Kafka
#Data Modeling
#Scalability
Data Engineer
•
System Design
•
hard
Design a system to process and store LinkedIn Feed impressions to ensure we do not show the same post to a user more than twice in a 24-hour period.
#Caching
#Bloom Filters
#Stream Processing
Data Engineer
•
System Design
•
hard
Design a system to detect spam connection requests on LinkedIn in near real-time.
#Machine Learning Pipelines
#Stream Processing
#Feature Engineering
Data Scientist
•
System Design
•
hard
At a high level, how would you design the ranking algorithm for the LinkedIn Feed?
#Ranking
#Machine Learning Architecture
#Personalization
Data Scientist
•
System Design
•
hard
How would you design an experimentation platform that accounts for bipartite network interference between job seekers and recruiters?
#Experimentation Architecture
#Bipartite Networks
#Marketplaces
Data Scientist
•
System Design
•
hard
Design the architecture and metrics for a real-time 'Trending News' module on the LinkedIn homepage.
#Real-time Systems
#NLP
#Ranking
Data Scientist
•
System Design
•
hard
How would you scale the 'People You May Know' graph algorithm to efficiently compute recommendations for 800M+ users daily?
#Big Data
#Graph Processing
#Scalability
Data Scientist
•
System Design
•
hard
Design an automated anomaly detection system to track and alert on data quality issues in the core user profile database.
#Data Quality
#Anomaly Detection
#Monitoring
Data Scientist
•
System Design
•
hard
How would you design a recommendation system for LinkedIn Learning courses?
#Recommender Systems
#Collaborative Filtering
#Cold Start
Data Scientist
•
System Design
•
hard
Design the data pipeline and telemetry required to support LinkedIn's 'Who Viewed Your Profile' feature.
#Data Engineering
#Streaming
#Batch Processing
DevOps Engineer
•
System Design
•
hard
Design a highly available and scalable image storage service for LinkedIn profile pictures. How do you handle caching and global distribution?
#Object Storage
#CDN
#Scalability
#Database Design
DevOps Engineer
•
System Design
•
hard
Design a log aggregation system capable of handling petabytes of data per day from thousands of microservices.
#Logging
#Elasticsearch
#Kafka
#Data Pipelines
DevOps Engineer
•
System Design
•
hard
Design a distributed rate limiter for LinkedIn's public API to prevent abuse. How do you handle synchronization across multiple nodes?
#Rate Limiting
#Redis
#Distributed Systems
#Algorithms
DevOps Engineer
•
System Design
•
hard
How would you design a highly available Kafka cluster across multiple data centers to support LinkedIn's real-time activity data?
#Kafka
#Distributed Systems
#High Availability
#Replication
Frontend Engineer
•
System Design
•
medium
Design the 'People You May Know' (PYMK) carousel component.
#Component Architecture
#Lazy Loading
#Intersection Observer
Frontend Engineer
•
System Design
•
hard
Design a real-time notification system for the web client.
#Real-time
#Polling
#WebSockets
#Service Workers
#Push Notifications
Frontend Engineer
•
System Design
•
medium
Design a photo upload and cropping tool for the profile picture feature.
#File API
#Canvas API
#UX
#Performance
Frontend Engineer
•
System Design
•
hard
Design the job application form flow, ensuring it handles offline caching and auto-saves.
#Forms
#Offline Storage
#IndexedDB
#UX
Frontend Engineer
•
System Design
•
medium
Design the LinkedIn 'Who viewed your profile' dashboard.
#Data Visualization
#Pagination
#API Design
#Component Architecture
Frontend Engineer
•
System Design
•
hard
Design the frontend architecture for the LinkedIn News Feed.
#Architecture
#Performance
#Virtualization
#State Management
#Pagination
Frontend Engineer
•
System Design
•
hard
Design the LinkedIn Messaging Web App.
#WebSockets
#Real-time
#Offline Support
#State Management
Full Stack Engineer
•
System Design
•
medium
Design a rate limiter for the LinkedIn Connections API to prevent scraping.
#Security
#Distributed Systems
#Algorithms
Full Stack Engineer
•
System Design
•
medium
Design a system to track and display 'Who viewed your profile' in real-time.
#Stream Processing
#Caching
#Aggregation
#Kafka
Full Stack Engineer
•
System Design
•
hard
Design the LinkedIn Job Search system.
#Search Engines
#Elasticsearch
#Microservices
Full Stack Engineer
•
System Design
•
medium
Design the LinkedIn Endorsement system, where users can endorse connections for specific skills.
#Databases
#API Design
#Scalability
Full Stack Engineer
•
System Design
•
hard
Design LinkedIn Messaging. It needs to support 1-on-1 and group chats with real-time updates.
#WebSockets
#Real-time
#Databases
#Microservices
Full Stack Engineer
•
System Design
•
hard
Design the 'People You May Know' (PYMK) recommendation system.
#Graph Processing
#Batch Processing
#Machine Learning Infrastructure
Full Stack Engineer
•
System Design
•
hard
Design the LinkedIn News Feed.
#Architecture
#Scalability
#Databases
#Caching
Machine Learning Engineer
•
System Design
•
hard
Design a Job Recommendation system that matches users to newly posted jobs.
#Recommendation Systems
#Information Retrieval
#NLP
#Two-Tower Models
Machine Learning Engineer
•
System Design
•
hard
Design LinkedIn's 'People You May Know' (PYMK) recommendation system.
#Recommendation Systems
#Graph Processing
#Scalability
#Machine Learning
Machine Learning Engineer
•
System Design
•
hard
Design the machine learning architecture for LinkedIn's Feed Ranking.
#Recommendation Systems
#Ranking
#Deep Learning
#System Architecture
Machine Learning Engineer
•
System Design
•
hard
Design an Ad Click-Through Rate (CTR) prediction system for LinkedIn Sponsored Content.
#Ads
#CTR Prediction
#Imbalanced Data
#Online Learning
Machine Learning Engineer
•
System Design
•
medium
Design a system to automatically extract and standardize skills from a user's unstructured profile text and resume.
#NLP
#Named Entity Recognition
#Knowledge Graph
#LLMs
Machine Learning Engineer
•
System Design
•
medium
Design a personalized search autocomplete system for the LinkedIn search bar.
#Search
#Trie
#Personalization
#Low Latency
Machine Learning Engineer
•
System Design
•
medium
Design a machine learning system to detect fake profiles and spam accounts at registration.
#Anomaly Detection
#Classification
#Graph ML
#Security
Machine Learning Engineer
•
System Design
•
hard
Design a notification routing system that decides whether to send a notification via Email, Push, or In-App, and at what time.
#Reinforcement Learning
#Contextual Bandits
#Optimization
#User Experience
Product Manager
•
System Design
•
medium
How would you design an API for third-party Applicant Tracking Systems (ATS) to integrate with LinkedIn Jobs?
#API Design
#B2B Integration
#Security
Product Manager
•
System Design
•
hard
Design the system architecture for LinkedIn Messaging to handle millions of concurrent users.
#Real-time Communication
#WebSockets
#Database Sharding
Product Manager
•
System Design
•
medium
Explain how the LinkedIn Feed ranking algorithm works at a high level to a non-technical stakeholder.
#Recommendation Systems
#Communication
#Algorithms
Product Manager
•
System Design
•
hard
How would you design a system to detect and remove fake profiles on LinkedIn in real-time?
#Machine Learning
#Stream Processing
#Trust & Safety
Product Manager
•
System Design
•
hard
Explain how you would design the backend architecture for LinkedIn's 'People You May Know' feature.
#Graph Databases
#Scalability
#Batch Processing
Software Engineer
•
System Design
•
hard
Design the LinkedIn News Feed. Users should be able to see updates from their connections, companies they follow, and relevant ads. How do you handle high read/write volumes?
#Scalability
#Database Design
#Caching
#Message Queues
Software Engineer
•
System Design
•
medium
Design a distributed rate limiter for LinkedIn's public API.
#Algorithms
#Redis
#Distributed Systems
#API Gateway
Software Engineer
•
System Design
•
medium
Design LinkedIn's Typeahead Search (Autocomplete).
#Trie
#Caching
#Low Latency
#Data Partitioning
Software Engineer
•
System Design
•
hard
Design a system to detect and prevent spam or abusive content in LinkedIn posts and messages.
#Machine Learning Integration
#Stream Processing
#Rate Limiting
#Security
Software Engineer
•
System Design
•
hard
Design a real-time messaging system (LinkedIn InMail).
#WebSockets
#Chat
#NoSQL
#Real-time
Software Engineer
•
System Design
•
medium
Design the LinkedIn Endorsements feature. How do you store and query who endorsed whom for what skill?
#Database Schema
#High Throughput
#Caching
Software Engineer
•
System Design
•
medium
Design a Notification System for LinkedIn that handles push, email, and in-app notifications.
#Pub/Sub
#Asynchronous Processing
#Rate Limiting
#Microservices
Software Engineer
•
System Design
•
hard
Design the LinkedIn Job Search and Application system.
#Search
#ElasticSearch
#Scalability
#Database Consistency
Software Engineer
•
System Design
•
medium
Design a system to track and display the number of profile views a LinkedIn member gets in real-time.
#Stream Processing
#Kafka
#Redis
#Time-series Data
Software Engineer
•
System Design
•
hard
Design LinkedIn's 'People You May Know' (PYMK) recommendation system.
#Graph Databases
#Batch Processing
#Machine Learning Infrastructure
#Hadoop/Spark
Software Engineer
•
System Design
•
hard
Design the LinkedIn News Feed. How would you handle feed generation, ranking, and distribution for users with thousands of connections?
#Microservices
#Caching
#Fan-out
#Databases
Software Engineer
•
System Design
•
medium
Design a system to track and display trending hashtags on LinkedIn over the last 24 hours.
#Stream Processing
#Heavy Hitters
#Algorithms
Software Engineer
•
System Design
•
medium
Design a Distributed Rate Limiter for LinkedIn's public APIs to prevent abuse.
#Distributed Systems
#Caching
#Algorithms
Software Engineer
•
System Design
•
medium
Design a Typeahead Search (Autocomplete) for LinkedIn connections and global search.
#Trie
#Caching
#Search
Software Engineer
•
System Design
•
hard
Design a system to detect fake profiles and bot activity on LinkedIn in near real-time.
#Stream Processing
#Machine Learning Infrastructure
#Security
Software Engineer
•
System Design
•
hard
Design LinkedIn Messaging. Users should be able to send 1-on-1 messages and group messages. Messages should sync across multiple devices in real-time.
#WebSockets
#Database Design
#Real-time Systems
Software Engineer
•
System Design
•
medium
Design a Notification System for LinkedIn. Users can receive push notifications, emails, and in-app alerts for various events (messages, connection requests, job alerts).
#Microservices
#Message Queues
#Scalability
Software Engineer
•
System Design
•
medium
Design a Profile View Counter. When someone visits a LinkedIn profile, the view count should increment. The user should be able to see who viewed their profile in the last 90 days.
#Stream Processing
#Database Design
#Aggregation
Software Engineer
•
System Design
•
hard
Design the LinkedIn Job Search and Recommendation system. How do you ingest millions of job postings and serve relevant recommendations to users in real-time?
#Search
#Machine Learning Infrastructure
#Data Pipelines
#Elasticsearch
Software Engineer
•
System Design
•
hard
Design LinkedIn's connection system. How would you efficiently store and query 1st, 2nd, and 3rd-degree connections for hundreds of millions of users?
#Graph Databases
#Scalability
#Data Modeling
Difficulty Radar
Based on recent AI-sourced data.
Meet Your Interviewers
The "Standard" Interviewer
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.