System Design Interview Handbook by @abhi_techhub

System Design Interview Handbook

This handbook is designed to be a comprehensive resource for cracking SDE-2, Backend, and Product-Based Company interviews, focusing on the essential skills of system design.

Key Takeaway: System design is not about memorizing architectures, but understanding how to build scalable, reliable, fault-tolerant, and production-ready systems.

Core Concepts Covered:

• System Design Fundamentals: High-Level Design (HLD) vs. Low-Level Design (LLD).
• Scalability:
  • Vertical Scaling (Scale Up): Increasing resources (CPU, RAM) of a single server.
  • Horizontal Scaling (Scale Out): Distributing load across multiple servers.
• Load Balancers & Reverse Proxy: Distributing traffic and improving performance.
• CDN (Content Delivery Network): Reducing latency and improving availability through global distribution.
• Databases:
  • SQL vs. NoSQL: Understanding the trade-offs.
  • Replication & Sharding: Strategies for scaling databases.
• Caching:
  • Redis & Caching Strategies: Techniques for improving read performance.
• Event-Driven Architecture:
  • Kafka, RabbitMQ: Tools for asynchronous communication.
• Microservices:
  • API Gateway: Managing microservice interactions.
  • Service Discovery & Circuit Breaker: Patterns for resilient microservice architectures.
• Distributed Transactions:
  • Saga Pattern: Managing complex transactions across services.
• Storage Systems: Including CDN.
• Reliability, Availability & Fault Tolerance: Ensuring systems remain operational.
• Rate Limiting & Idempotency: Controlling request flow and ensuring safe retries.
• Performance Optimization: Including query tuning.
• Monitoring, Logging & Observability: Essential for understanding system health.
• CAP Theorem & Consistency Models: Understanding trade-offs in distributed systems.
• Real-World Architecture Best Practices: Practical application of concepts.
• Production Tips & Interview Cheat Sheet: Actionable advice for interviews and production environments.

Learning Approach:

• Each concept is explained with visual diagrams, real-world examples, architecture illustrations, interview tips, production best practices, and common mistakes.
• The goal is to foster understanding rather than rote memorization.

Call to Action:

• Save this post for interview preparation.
• Share it with developer friends.
• Comment "SYSTEM" and Follow @abhi_techhub to receive the complete PDF via Direct Message.

Posted by: Abhishek (@abhi_techhub) Date: July 19, 2026

Hashtags: #systemdesign #backend #softwareengineer #sde #interviewpreparation #scalability #microservices #redis #kafka #docker #database #sql #distributedsystems #devops #coding #faang #programming #java #developers #abhitechhub