System Design + HLD Mastery Notes

⚡ Core System Design Fundamentals

• Optimizing API Performance
• Designing for Read-heavy vs Write-heavy systems
• Communication Protocols (REST, async, messaging)
• Change Data Capture (CDC) patterns

🧠 Scalability & Distributed Systems

• Handling millions of users & requests
• Scaling databases (horizontal & vertical strategies)
• Designing low-latency, high-availability systems
• Real-time vs batch processing decisions

🏗️ Real Interview System Design Questions

Learn how to design systems like:

• Ticketmaster
• Booking Systems (Hotel, Flight)
• Uber / Swiggy / Zepto (real-time logistics)
• WhatsApp
• Notification Systems
• Twitter
• Facebook / Instagram / Newsfeed
• YouTube
• Netflix / OTT platforms
• Amazon (Checkout, Payments, Search)
• Top-k system
• Payment System
• Google Docs
• Dropbox (collaboration & storage)
• Spotify (streaming systems)
• Tinder (matching system)
• URL Shortener
• Tagging System
• Zepto/blinkit/Gopuff
• Rate Limiter
• Key-Value Store

🔧 Advanced System Design Problems

• Distributed Job Scheduler
• Ad Click Aggregator
• Online Auction Systems
• Autocomplete & Search Systems
• Real-time Monitoring & Alerting
• Distributed Log Monitoring
• Stock Broker Systems
• Live Comments
• Google calender

and many more