Cybersecurity enthusiast and software developer. Most of what I build has to do with trust boundaries — a proxy forwarding data it never checked, an admin panel believing a value from the browser.
8 pull requests merged into projects other people maintain. Each one started with reproducing a bug or fuzzing the code to find one.
| Project | Merged fix |
|---|---|
| TheAlgorithms/Python | tree_sort silently dropped duplicate values · stalin_sort raised IndexError on an empty list |
| vadimdemedes/ink | PTY tests spawned the wrong Node executable |
| mampfes/hacs_waste_collection_schedule | Broken scrapers repaired after providers changed their sites: Sjöbo · Lindau · RESO · CIDIU · Borlänge |
Security tooling, under review
- microsoft/DevSkim#789 — a rule regex (DS440011) backtracked catastrophically: a 200 KB line took 51 s to scan. Rewrote it with a bounded quantifier and added a timing test.
- github/codeql#22630 —
the
actions/unpinned-tagquery trusted floating tags like@v4on "immutable" Actions. Only full versions and SHAs are immutable, so the query now flags the rest. Fixes #22414.
Bug reports that pinned down a root cause
- gradio-app/gradio#13781 —
traced missing type stubs to a packaging path where the
.pyifiles are only generated as a side effect of importing the package, so a clean build shipspy.typedwith no stubs behind it - microsoft/playwright#42402 —
reproduced a libuv teardown crash on Windows and narrowed it to the update
check's
fetch()call
A local, zero-trust LLM proxy. Point an OpenAI SDK, LangChain, or any HTTP
client at localhost:8000/v1 instead of the provider, and every request gets
PII-scrubbed, cost-tracked, rate-limited and cached — streaming included —
whether it's headed to OpenAI, Anthropic, Gemini or a local Ollama model.
Python · FastAPI · SQLite · Docker
The interesting part is the sanitizer: reversible placeholders, Luhn-validated card detection, and structurally-validated SSNs, so it redacts without mangling order numbers. Nothing leaves the machine except the sanitized request.
Security — redaction engines, auth boundaries, and the general problem of code that checks something in the browser and calls it authentication. Mostly this means checking whether a tool actually does what it says, and adding a test once it does — including tools that do the checking for other people (DevSkim, CodeQL).
Backends — Python and FastAPI mostly. Provider adapters, streaming, caching, usage accounting.
Web — ordering systems and admin tooling in HTML/JS, plus TypeScript.
Python FastAPI SQLite Docker JavaScript TypeScript HTML/CSS Git
Reach me at nafayhassan3324j@gmail.com