Essays & notes

Garbage Sentry data led us to multiple SDK bundles and wildcard imports. Fixing the init pattern and tree-shaking cut our Sentry payload from 400KB to 70KB.

A production debugging story — how I tracked down a 1GB memory leak on a crypto trading platform caused by a subtle useEffect dependency and unmemoized table re

Building a Razorpay payment flow that works across web, React Native, and WebView — with a postMessage bridge, HMAC verification, and webhook reconciliation.

RRule-based recurring availability, lazy slot generation with IST-UTC conversion, FOR UPDATE SKIP LOCKED for race-safe booking, and payment locking with cron-based cleanup.

How we built a real-time clinical assessment engine using Socket.IO, Redis state machines, and config-driven scoring — with emergency short-circuits for risk detection.

Rendering 20 message types in a single chat UI with a switch statement, the isLastMessage single-active-step pattern, and three hooks pushing to one Redux store.

Deploying Prometheus, Grafana, Loki, Tempo, and Alertmanager for a Node.js backend. What actually caught production issues and what was overkill.

Building an Axios-based HTTP client with linear backoff retries, a subscriber queue for silent token refresh, server-down detection via CustomEvents, and forced logout after repeated failures.

Phone-based OTP auth with crypto-safe generation, cookie-only JWT delivery, escalating rate limits across six tiers, and full refresh token rotation with bcrypt verification.