I build the software other developers build on, mostly the hard, low-level kind that has to keep working when everything around it has failed.
- KSCrash is the crash reporter at the core of most independent iOS crash-reporting SDKs: Sentry, Bugsnag, Datadog, Embrace, bitdrift, Raygun and Rollbar all ship it. This code is estimated to have been installed over 100 billion times as an app SDK, so it MUST NOT FAIL.
- I've built observability SDKs for several of those vendors: Sentry's first iOS SDK, Bugsnag's OpenTelemetry-compatible performance SDK, Embrace's sampling profiler, and bitdrift's crash-resilient storage (in Rust).
Orpheum is a self-hosted media server for your own films and series, which you can watch from anywhere with no VPN and no open ports. Coding agents built it in seven weeks under my direction, behind tests and gates designed to make their output trustworthy. How it's built.
Built along the way:
- ffmpeg-fdproxy runs FFmpeg fully confined (no network, no file-system path) while it reads untrusted media. Audited spec drafts, fuzzed under ASan and UBSan.
- yoloAI gives coding agents a disposable sandbox. The agent works on a copy, you review the diff, and credentials never enter the box.
- BONJSON is a binary drop-in replacement for JSON that decodes a median 2.2× faster than yyjson, the fastest JSON library. Implementations in C, Go, Rust and Swift.
- Musashi is a Motorola 680x0 emulator I wrote in the '90s. MAME still ships my CPU cores.
- ObjectAL · iOS-Universal-Framework · KSReachability
I'm available for contract work and senior roles, remote or around Berlin: crash reporting, observability SDKs, security-sensitive systems, and making agent-built code production-grade.