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…
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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,…