Backend and developer-tooling work in Node and TypeScript. I like the unglamorous parts — streams, file pipelines, protocol edge cases, the bug that only shows up on the third reconnect.
Full-stack developer at I-3 Integrated Co., Chandigarh.
Bugs I found by reading the source, reproduced with a failing test, and fixed.
| Project | Contribution | Status |
|---|---|---|
| fastmcp | #366 — embedded() silently dropped resource contents when a template's load() returned an array, producing a response that failed MCP schema validation |
Merged, shipped in v4.20.9 |
| hocuspocus | #1155 — an onLoadDocument hook returning the document it was handed made the server encode the whole document and apply it back to itself, on the first connection to every document |
Merged |
| hocuspocus | #1157 — a document created for a load that threw was never destroyed, leaking a Y.Doc and an Awareness timer per rejected connection |
Merged |
| fastmcp | #369 — the documented ping default for HTTP streaming never applied, because it keyed off a field no transport sets | Open |
| sharp | #4602 — JxlOptions did not declare the animation options jxl() actually accepts |
Open |
| ioredis | #2187 — a failed auto-resubscribe after reconnect became an unhandled rejection, ending the process even with an error handler registered | Open |
Upfly — file-handling middleware for Node APIs. A custom Multer storage engine that streams uploads through Sharp and on to S3, GCS or Cloudinary, with a fallback stream that preserves the original if the transform fails. Published on npm.
Upfly for VS Code — drop an image into a watched folder and it converts, uploads, and returns a CDN URL. File-stability polling, loop prevention and a git-tracked-file guard, because the naive version corrupts half-written files.
ReCollect — a collaborative workspace built on Yjs CRDTs with a custom Hocuspocus WebSocket server, plus multi-model AI routing across Gemini, OpenAI, Groq and Cohere. The most technically involved thing I've built, and where most of my Redis, BullMQ and WebSocket experience comes from.
TypeScript · JavaScript · Node · Express · Next.js · React · PostgreSQL · MongoDB · Redis · BullMQ · WebSockets · Yjs · Sharp · AWS S3 · Cloudinary · GCS
B.Tech CSE, Rayat Bahra University, 2026.
Reach me at rinkalkumar737@gmail.com · LinkedIn · npm