Build a Distributed Rate Limiter Across 100+ API Gateway Nodes Premium
Design a rate limiter that enforces per-user and per-tenant request limits globally across a horizontally scaled API gateway fleet, with no single coordinator bottleneck and sub-milliseclient enforcement latency.
Build JWT Auth System at Production Scale Premium
A production-grade deep dive into designing a complete JWT authentication system: architecture, login flow, request verification, token rotation, key management, and security hardening.
Build a Schema Registry for Event-Driven Systems Premium
Design a schema registry that enforces backward and forward compatibility for Kafka topics, prevents breaking changes from reaching production, and lets consumers evolve independently of producers.
Build WhatsApp Message Delivery with Offline Queuing Premium
Design an end-to-end encrypted messaging system that delivers messages to online users in under 100ms, queues messages durably for offline users, and guarantees delivery exactly once when they reconnect.