Series
System Design Interview Prep
- 02
Microservices Architecture: Decomposition, Communication, and Trade-offs
When microservices help, when they hurt, and how to decompose a monolith the right way.
•22 min read 
03System Design HLD Example: Web Crawler
A practical interview-ready HLD for a distributed web crawler handling politeness, deduplication, and scale.
•32 min read- 04
System Design HLD Example: Video Streaming (YouTube/Netflix)
A practical interview-ready HLD for a video streaming platform with adaptive bitrate and CDN delivery.
•27 min read - 05
System Design HLD Example: Ride Sharing (Uber)
A practical interview-ready HLD for a ride-sharing platform with real-time matching and location tracking.
•27 min read - 06
System Design HLD Example: Proximity Service (Yelp)
A practical interview-ready HLD for finding nearby restaurants, hotels, and points of interest.
•26 min read - 07
System Design HLD Example: Real-Time Leaderboard
A practical interview-ready HLD for a real-time gaming leaderboard with fast rank queries.
•24 min read - 08
System Design HLD Example: Distributed Job Scheduler
A practical interview-ready HLD for a distributed job scheduler handling millions of scheduled tasks.
•31 min read - 09
System Design HLD Example: Hotel Booking System (Airbnb)
A practical interview-ready HLD for a hotel booking platform handling availability, concurrency, and reservations.
•24 min read - 10
System Design HLD Example: E-Commerce Platform (Amazon)
A practical interview-ready HLD for a large-scale e-commerce system handling catalog, cart, inventory, and orders.
•22 min read - 11
System Design HLD Example: Collaborative Document Editing (Google Docs)
A practical interview-ready HLD for real-time collaborative editing with conflict resolution and sync.
•33 min read - 12
Distributed Transactions: 2PC, Saga, and XA Explained
How to maintain data consistency across microservices when ACID transactions don't span databases.
•26 min read 
13System Design HLD Example: URL Shortener (TinyURL and Bitly)
A practical interview-ready HLD for a short-link platform with heavy read traffic.
•23 min read- 14
System Design HLD Example: Search Autocomplete
Design sub-10ms prefix lookup, ranking, typo tolerance, trending boosts, and language-partitioned indexes at Google scale.
•27 min read - 15
System Design HLD Example: Rate Limiter (Global API Protection)
Design a production-grade HLD for distributed rate limiting with fairness and low latency.
•28 min read - 16
System Design HLD Example: Payment Processing Platform
An interview-ready HLD for payments focusing on correctness, idempotency, and recovery.
•25 min read - 17
System Design HLD Example: Notification Service (Email, SMS, Push)
Design a multi-channel notification platform with retries, preferences, and provider failover.
•25 min read - 18
System Design HLD Example: News Feed (Home Timeline)
Interview-focused HLD for a scalable social feed with fan-out and ranking trade-offs.
•22 min read - 19
System Design HLD Example: File Storage and Sync (Google Drive and Dropbox)
Build an HLD for file storage, metadata consistency, and cross-device synchronization.
•25 min read - 20
System Design HLD Example: Distributed Cache Platform
Interview HLD for a distributed cache with eviction, invalidation, and resilience trade-offs.
•27 min read