System Design Drill Day 15: Real-Time Chat and Live Order Tracking
How to design real-time chat and live tracking: polling vs SSE vs WebSockets, a Redis pub/sub backplane, sequence numbers and resync.
#redis
Posts tagged #redis
System Design Drill Day 14: URL Shortener and Unique ID Generation
How to design a URL shortener: base62 codes, ID generation strategies, 301 vs 302 redirects, Redis caching and async click analytics.
System Design Drill Day 13: Designing a Multi-Channel Notification System
How to design a notification service with per-channel workers, priority queues, preferences, dedup and signed webhook retries.
System Design Drill Day 8: Distributed Locks with Redis and Fencing Tokens
How distributed locks work with Redis SET NX EX, why leases and fencing tokens matter, and where locks fit in a checkout.
System Design Drill Day 7: Rate Limiting APIs, Logins and OTPs with Redis
The main rate-limiting algorithms, how to run them atomically across servers with Redis and Lua, and when to fail open or closed.
System Design Drill Day 3: Queues and Async Jobs for Checkout
Why slow work belongs on a queue, what at-least-once delivery means, and how retries and idempotency keep background jobs safe.
