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System Design Notes
System Designfor Developers
How to design systems that scale. Follow a structured learning path, then practise on interview questions about the building blocks: caching, queues, databases, microservices and more. Free to read online.
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Learning paths
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Topics
280
Practice questions
Interview Prep Pack · PDF
System Design Interview Pack
- A 7-step method for answering any system design question, plus estimation numbers
- 5 worked designs: URL shortener, rate limiter, chat, news feed and file storage
- Guides to caching, databases, queues, consistency and reliability, with a 4-week study plan
- 306 practice questions with answers on caching, databases, queues, microservices, APIs and more
$3.99 one-time · instant email delivery
Also available: 2,000 Interview Questions & Answers $7.99
The questions developers get asked in interviews, across 89 topics, with short answers, in-depth explanations, common mistakes and follow-ups.
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The material stays free to read online. This is the organised, offline, print-ready PDF edition. Secure payment by PayPal; your personal download link is emailed after payment is confirmed. Digital product, no shipping.
Start here: system design learning paths
Week-by-week plans for the system design interview and for real-world design work, from beginner to expert. Pick the level you are at today.
How to Dominate Your System Design Interviews from Scratch: A Beginner’s Blueprint
Beginner
6 weeks
If You Want to Ace Your System Design Interview as a Beginner, Follow This Exact Path.
Beginner
6 weeks
If You Want to Conquer System Design Interviews as a Beginner, Follow This Exact Path
Beginner
6 weeks
Master System Design Interview Prep: A Beginner’s Roadmap to Success
Beginner
6 weeks
Crush Your System Design Interview: The No-Nonsense Path for Intermediate Developers
Intermediate
6 weeks
If You Want to Ace Your System Design Interview, Stop Skipping the Fundamentals.
Intermediate
6 weeks
If You Want to Ace Your System Design Interviews, Ditch the Overviews and Embrace Depth.
Intermediate
6 weeks
If You Want to Ace Your System Design Interviews, Follow This Exact Roadmap.
Intermediate
6 weeks
If You Want to Master System Design Interview Prep in 2026, Follow This Exact Path
Intermediate
6 weeks
If You Want to Master System Design Interview Prep, Stop Overlooking the Fundamentals.
Intermediate
6 weeks
If You Want to Ace Your System Design Interviews, Stop Overlooking the Fundamentals.
Advanced
6 weeks
If You Want to Ace Your System Design Interviews, Stop Overthinking and Start Practicing This Path.
Advanced
4-6 weeks
If You Want to Master System Design Interview Prep at an Advanced Level, Follow This Exact Path
Advanced
6 weeks
Master System Design Interviews: The Advanced Path to Success
Advanced
6 weeks
Master System Design Interviews: The No-Nonsense Path for Advanced Developers
Advanced
6 weeks
If You Want to Ace Your System Design Interviews, Ditch the Theory and Get Hands-On
Expert
6 weeks
If You Want to Ace the System Design Interview, Stop Overthinking and Start Building.
Expert
6 weeks
Master System Design Interview Prep: Skip the Traps and Secure Your Dream Offer
Expert
6 weeks
Master System Design Interviews with Real-World Projects and Deep Understanding
Expert
6 weeks
Master System Design Interviews: A Brutal and Honest Path for Experts
Expert
8 weeks
Master System Design Interviews: The Expert’s Roadmap to Success
Expert
6 weeks
Master System Design Interviews: The Unfiltered Path for Experts
Expert
6 weeks
Master the System Design Interview: Your Expert-Level Path to Success
Expert
6 weeks
Mastering System Design Interview Prep: The Unfiltered Expert’s Path
Expert
6 weeks
Mastering System Design Interviews: The Expert’s Blueprint for Success
Expert
6 weeks
Practise the building blocks
Interview questions with answers on the pieces every large system is made of. Each link opens the questions for that topic.
Database transactions & ACID
28 questions
Practise →
Concurrency & multithreading
27 questions
Practise →
Caching strategies
26 questions
Practise →
Microservices architecture
26 questions
Practise →
Big-O & time complexity
25 questions
Practise →
Database indexing & optimization
24 questions
Practise →
Webhooks & event-driven architecture
24 questions
Practise →
Kubernetes basics
21 questions
Practise →
Message queues (RabbitMQ/Kafka basics)
20 questions
Practise →
Redis
19 questions
Practise →
AWS fundamentals
17 questions
Practise →
Nginx & web servers
14 questions
Practise →
REST API design
9 questions
Practise →