Mastering PostgreSQL Connection Pooling in Node.js and TypeScript Services
Most database crashes in Node.js apps don’t happen because of heavy queries. They happen because of unmanaged connection pools. When your TypeScript…
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Fillable Tax Forms with Asynchronous Jobs, Retries, and Latency Control
A Node.js service can fill a tax form inline, but accepting the request is not the expensive part. Preserving page geometry while filling fields, va…
We fixed a hidden bug in a system processing 10M+ messages a day.
9 min read · warehouse execution system, global retail & manufacturing A few years ago I worked on a warehouse execution system (WES) — the soft…
Beyond TTL: Explicit Cache Invalidation
Most engineers default to TTL for cache invalidation. But a simple Time-To-Live guarantees stale reads for a duration, which is unacceptable for cri…
Why Daily Transaction Volume is the Wrong Number to Quote in System Design Interviews
The Mistake Most Candidates Make Picture this: You are in a system design interview. The interviewer asks you to design a ledger system or a payment…
Your "Cache Invalidation is Hard" Answer Misses the Real Horror
Your "Cache Invalidation is Hard" Answer Misses the Real Horror Most engineers parrot "cache invalidation is hard" as a standard interview response,…