Swapnanil Chakraborty
Software engineer working across the stack in TypeScript: React and Next.js interfaces, Node.js and PostgreSQL services, and LLM features in production.
I work remotely from Kolkata, India, and I am available from 1 October 2026.
In numbers
- ~400sales calls a day through a platform I built and own
- 10,000+calls transcribed and scored by an LLM pipeline I wrote
- 0reverts across 264 commits in production codebases
Recent work
- Frontend
An editable page that keeps the cursor where you left it
In-place editing in React where the rest of the page re-renders on every keystroke and the cursor never jumps.
- AI
What did that AI generation cost?
Cost accounting across four LLM providers, where an unknown model gets no price rather than a wrong one.
- Backend
The timezone bug that judged people unfairly
Weekly targets that were only correct on a server in India, and the timezone-independent fix.
- Backend
Four races, four different locks
Row locks, an advisory lock, a partial unique index and a write-ahead ledger, each chosen for the shape of its race.