At sufficient scale everything fails all the time, and the only real feature is being able to watch it happen.

_{— me, to a 🦆}

I work on the metric backend of Checkmk, its data backend for OpenTelemetry metrics that lets it monitor applications, not just infrastructure.
Before that I was at SAP, building the CI/CD infrastructure for HANA (their in-memory database): a graph-based task execution framework running on ~2000 compute nodes spread across multiple cloud providers and regions.

since 2021            csshW: broadcast your keystrokes to all your SSH sessions (successor: cssh-rs)
PyConDE '25            Rustifying Python: what's worth moving to Rust, and what will go wrong

2026-10-29 10:16 CET   Checkmk/checkmk data-backend: test the central connection in Setup
(2 weeks ago)          Checkmk/checkmk _{737 commits}

2026-10-29 10:16 CET   Checkmk/checkmk data-backend: test the central connection via REST
(2 weeks ago)          Checkmk/checkmk _{737 commits}

2026-09-03 22:49 CEST  whmade/cssh-rs  client: ConPTY DSR responder always answers cursor…
(september)            whmade/cssh-rs  _{570 commits · 118 pull requests · 152 issues}

2026-09-03 22:45 CEST  whmade/cssh-rs  client: size the ConPTY to the console viewport and…
(september)            whmade/cssh-rs  _{570 commits · 118 pull requests · 152 issues}

_{Last 30 days}

Python 62.2% (4.8k) · Rust 23.6% (1.8k) · TypeScript 7.3% (559) · Vue 6.0% (465) · Other 0.9% (66)

_{All time}

Python 27.0% (82.4k) · JavaScript 24.1% (73.5k) · TypeScript 13.9% (42.4k) · Rust 13.1% (40.1k) · Vue 10.4% (31.9k) · Other 11.5% (35.2k)

_{Last updated 2026-11-12 22:29 CET.}

_{Everything above refreshes every few hours via a small workflow. Here's how it's computed.
The 🦆 is maintained by hand.}