Logs That Lie Free
The dashboard says everything is green. Users are screaming on Twitter. You have terabytes of logs but zero visibility into what's actually failing.
One User, One Million Followers: The Fanout Problem Nobody Warns You About Free
A celebrity signs up. Their first post triggers a write to 1 million inboxes in real time. Your architecture was never designed for this. Here's how to fix it.
The 200ms Promise: How to Rescue an API That's Bleeding Latency Premium
Your PM demos the app to investors. Every API call takes 2 seconds. You have one weekend to fix it. Here's exactly where to look and what to do.
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.
The 3 AM Black Friday Meltdown: How to Design Auto-Scaling That Actually Works Premium
Your flash sale just went live. Traffic spiked 50x. The monolith is melting. Here's the architecture that saves you before it happens.
The Database Is the Bottleneck. Always. Premium
CPU is 10%. RAM is fine. But the DB has 8,000 connections and is sweating. One missing index and one N+1 query and the whole system chokes.
The Ghost Writes Twice: Concurrent Updates and Silent Data Corruption Premium
Two services updated the same record simultaneously. One wins. The other silently loses. No error, just wrong data discovered three weeks later.
The Microservice That Knew Too Much: Breaking Circular Dependencies Free
You split the monolith into 12 services. But service B calls A, which calls C, which calls B again. A circular dependency wrapped in JSON.
Deploy at 4:59 PM on a Friday: Zero-Downtime Deployments That Actually Work Premium
A senior engineer pushes a small fix right before the weekend. By 5:05 PM the on-call phone rings. Zero-downtime deployments suddenly matter a lot.
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.
The Inbox & Outbox Pattern Free
How distributed systems guarantee message delivery without losing your mind - or your data.
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.
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.
Designing a URL Shortener Free
A deep dive into designing a scalable URL shortening service like bit.ly - covering hashing strategies, storage, redirection, and analytics.