System Design Interview Guide
A practical learning path for system design interview preparation, from core concepts to full interview-style problems.
Use this guide as a structured roadmap. Start with the fundamentals, learn the reusable building blocks, then practice full system design problems.
Quick Start
Start here if you are new to system design interviews or want a clear preparation plan.
- How to Use This Guide
- What System Design Interviews Test
- 50-Minute Interview Framework
- Common Mistakes
- 7-Day Crash Plan
- 30-Day Study Plan
Core Building Blocks
Understand the core components that appear in most system design interviews.
Problems
Practice full system design problems and learn how to structure an interview-ready answer.
Deep Dive Toolkit
Learn the deeper concepts that help you explain tradeoffs, handle scale, and answer follow-up questions.
- Optimistic, Pessimistic & Distributed Locking
- Bloom Filter
- Partitioning / Sharding Basics
- Consistent Hashing
- Rate Limiting Algorithms
- Idempotency & Deduplication
- Backpressure & Circuit Breaker
- TTL, Expiration & Cleanup
Patterns
Learn common system design patterns behind many real interview problems.
- Read-heavy Systems
- Write-heavy Systems
- Real-time Messaging
- Fanout: Read vs Write
- Large File Processing
- Distributed Sync
Before Interview / Cheat Sheets
Use these guides to review quickly before your interview.