I build production systems that don't break.
Backend Systems Engineer at SkyCom Japan. Japan Patent holder, IEEE author, and author of open-source packages on PyPI, npm and NuGet.
Enterprise document infrastructure at work, plus open-source packages on PyPI, npm and NuGet, and a SaaS I run myself.
The PDF engine behind SkyCom’s document products: parsing, rendering and signature validation at the byte level, shipped as RPM packages. The My Number Card signing work inside it became patent JP 2025-169170 A.
Open-source stealth browser automation for autonomous agents, built on Playwright. Coherent fingerprinting across TLS, navigator, WebGL and Canvas, human behaviour simulation, block-detection with recovery, and an MCP server so AI agents can drive it directly. v3.0.0 on PyPI, MIT licensed, CI green across pytest, ruff, mypy, CodeQL and a Docker smoke test.
Lets a Python script or an AI agent drive the Microsoft Edge tab you already have open, so logged-in sessions, enterprise VPNs and saved credentials survive. CDP events travel over a local RFC 6455 WebSocket at a 9.09 ms P50 round trip, and batching 50 actions runs 7.9× faster than firing them one by one. It binds to 127.0.0.1:18999 and nothing else: no telemetry, no outbound calls, no dependencies past Python 3.10. v2.0.2 on PyPI, MIT licensed.
Eyes and hands on a Windows desktop for whichever agent you already run: screenshots plus real mouse and keyboard, one JSON object per command, no API key. A warm loopback server holds the display open through DXGI Desktop Duplication — 6 ms actions and 30 ms screenshots against roughly 300 ms per spawned process — and it installs its own agent skill into Claude Code, opencode or AGY. v1.3.1 on PyPI, MIT licensed, Pillow the only dependency.
Production SaaS built on top of the stealth engine above: a FastAPI service with API-key auth, usage metering and quota billing, PostgreSQL 16 with Alembic migrations, and a rotating-proxy layer. Deployed behind Cloudflare Tunnel on hardened Linux with systemd, resource caps and a dedicated service user.
A lightweight .NET library for System V shared memory and semaphores on Linux (x64, glibc). No native payloads, just P/Invoke to libc through shmget and semget, built for low-latency same-host IPC between processes. v1.0.1 on NuGet targeting .NET 6 and 8, MIT licensed.
Durable memory for coding agents, where a private git repo is the store and the audit log: every fact is an attributed, timestamped, revertible commit; no database, no service. Session hooks sync it between machines automatically, bounded by an explicit path allowlist.
A rule-driven validation engine for forms, running the same way in Node and in the browser. Cross-field dependencies, conditional rules, custom validators and per-field error reporting, written originally against messy PDF form data. v1.3.3 on npm, GPL-3.0.
Resume analysis pipeline that scores documents the way an applicant tracking system does: keyword matching, skill-gap detection, targeted rewrites.
Opens your mail app with the message prefilled. Prefer to write directly? shanewasahmed@gmail.com