Rajat Gajbhiye

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System Design - A Comprehensive Guide
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System Designs - A Comprehensive Guide


Actually, 80% of system design interview questions come from just 20% of topics. My guide helps you focus on what really matters, making your preparation smarter and more effective!


PS: Use the SDE10 Coupon code to get a 10% discount (only for the next few users, so GO CHECK IT OUT FAST!!!)

What’s Inside?????


PART 1: Understand System Design from Basics to Advanced

Learn system design step by step with clear explanations, real-world examples, and code snippets.

System Design Topics Covered:

  1. Introduction to System Design
  2. Scalability and Performance
  3. Latency and Throughput
  4. Architectural Patterns
  5. Availability and Availability Patterns
  6. Replication
  7. Consistency and Consistency Patterns
  8. CAP Theorem
  9. PACELC Theorem
  10. Database and Storage
  11. Relational Databases
  12. Database Isolation Levels
  13. Scaling Databases
  14. Sharding and Partitioning
  15. Non-Relational Databases
  16. Choosing the Right Database
  17. Caching
  18. Asynchronous Processing
  19. Message Queues (Kafka, RabbitMQ)
  20. Monolithic vs. Microservices Architecture
  21. Event-Driven Architecture
  22. API Gateway and Backend for Frontend (BFF)
  23. REST, GraphQL, and gRPC
  24. Long Polling, WebSockets, Server-Sent Events (SSE)
  25. Design Patterns
  26. Resiliency
  27. Designing for Resiliency
  28. Load Balancers
  29. Circuit Breakers
  30. System Essentials
  31. Consistent Hashing
  32. Networking and Communication
  33. Real-World Architectures & Engineering Blogs


PART 2: Ultimate Cheat Sheet

This quick-reference cheat sheet I made covers the most important system design concepts, making it easy to review key points right before your interview.

PART 3: 45 Detailed Q&A for LLD and HLD

45 carefully selected interview questions, covering both Low-Level Design (LLD) and High-Level Design (HLD). Each question comes with:

  • Clear explanations
  • Diagrams for better understanding
  • Real-world examples
  • Practical insights to simplify complex topics


PS: Use the SDE10 Coupon code to get a 10% discount (only for the next few users, so GO CHECK IT OUT FAST!!!)


If you're struggling with system design interviews, then to be honest you’re not alone and with so many concepts to learn, it’s very easy to feel overwhelmed.

BUT here’s the good news, you don’t actually need to know everything to ace the interview. In fact, 80% of system design interviews focus on just 20% of the topics (I know, hard to believe).

My guide (which I am very proud of) zeroes in on those key areas, helping you focus your efforts on what really matters. With a clear roadmap, you'll be better prepared and increase your chances of success!

What are people saying

Very detailed and insightful guide. I recommend everyone to purchase it if you are preparing for SD interviews. Just fews bucks can lead you to a high CTC!!!
Sarthak Pal Sharma
May 2025
Helped me to quickly update my system design skills and prepare for interview
Dhruvang Jhaveri
May 2025
There's much more work put in this that I would ever invest myself to check any gaps in my knowledge. Thank you for your work and saving me a lot of time!
Anonymous
Apr 2025
This is my honest review. Before encountering this resource also I knew most of the system design concepts., but what I lacked was the confidence. Just after reading Part-1 and Part-2 of this resource I cracked 5 system design interviews with ease. Will go through the rest of the tutorial for my personal and professional growth.
Nagamanoj Vankadhara
Apr 2025
This guide simplifies system design prep by focusing on the most important topics. With clear explanations, real-world examples, and a structured roadmap, it’s a must-have for interview success.
Anonymous
Apr 2025
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