Full-stack TypeScript developer specializing in a niche most developers avoid: binary file processing and automotive ECU firmware.
I design and ship production software end-to-end — from hex-level binary parsers to Fastify APIs, Next.js frontends, and Electron desktop clients talking to real hardware.
- 🔬 Binary analysis — parsing, hex-level structure mapping, checksum handling, reverse engineering of proprietary file formats
- ⚙️ Backends — Node.js / TypeScript, Fastify, Knex, Prisma, MySQL / PostgreSQL, Redis
- 🖥️ Frontends — Next.js, React, i18n, Tailwind
- 🔌 Desktop — Electron apps with hardware dongle integration
- 🔐 API security — HMAC request signing, rate limiting, quota systems
Building and running a production SaaS platform for the automotive chiptuning industry: a binary engine that parses ECU firmware across 95+ device types, plus the full stack around it — REST + HMAC-authenticated B2B API, a 9-language web app, and a Windows desktop client.
Most of my current work lives in private client repositories.
- 🌐 fethan.us
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fethan.us [at] gmail [dot] com - 💼 Available for freelance work — binary parsing, APIs, and full-stack TypeScript