System Design - backend
#01 Api
How to Design APIs That Never Break Their Clients Free
A deep dive into API versioning, backward compatibility, and evolution strategies - so you can ship confidently without waking up to angry users at 2am.
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#02 Jwt
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.
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#03 Redis
Rate Limiting Algorithms with Redis Free
A practical breakdown of three rate limiting algorithms - Fixed Window, Sliding Window, and Token Bucket - with plain-language explanations, Redis-backed Node.js implementations, and a trade-off comparison to help you pick the right one.
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#04 Databases
Schema Changes Without Downtime: The Art of Zero-Disruption Migrations Premium
How to evolve your database schema safely in production without taking your app offline - strategies, patterns, and real examples.
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