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Core Team Member Spotlight: Alex Rønne Petersen

April 18, 2026

Author: Andrew Kelley

Alex joined the team in October of 2024. Hard to believe it’s already been a year and a half since then!

Photograph of Alex looking sharp

Alex has demonstrated an insatiable appetite for expanding Zig’s support for various targets. The download page tells the story:

  1. 0.13.0 release - 4 months before joining, binary artifacts for 12 different targets provided, and the FreeBSD one had to be created by renting a server from the cloud because Zig lacked cross-compilation support targeting FreeBSD.
  2. 0.14.1 release - 6 months after joining, we didn’t bother to rent a FreeBSD server this time, but still the number went up to 13 different targets because Alex got loongarch64 and s390x working on Linux.
  3. 0.15.1 release - 10 months after joining, Alex got NetBSD and FreeBSD cross-compilation support working and the number jumped up to a whopping 23 different targets!
  4. 0.16.0 release - 18 months after joining, he got OpenBSD cross-compilation support working too and now there are 26 different targets.

This is just the visible stuff. Under the hood, he has contributed countless bug fixes to the various operating system API bits in the Zig standard library, leading to tangible improvements like greatly expanded target support for segfault handling and unwinding. These are the kinds of improvements that you don’t realize you miss until you don’t have them; the invisible quality of life enhancements that silently, thanklessly prevent your day from being ruined. You can see his meticulous work reflected in the target support in the release notes which he has taken responsibility for keeping up to date.

Furthermore, he’s been on top of the ever-growing pull request queue, tirelessly helping contributors get their changes landed. These kind of review efforts are challenging to do consistently, but they are the lifeblood of the project.

Alex is also currently the only Zig project maintainer other than me who has the patience and stamina to prepare the LLVM release upgrade branches. Every major version bump of LLVM is a source of untold misery and grief as we are reminded just how load bearing Zig is when it comes to LLVM’s test coverage.

Alex’s collaborative nature doesn’t stop at the Zig project. In the last 18 months he has landed 20 commits in LLVM as well as making 62 high quality, actionable bug reports, with 10 still open! He doesn’t just complain when a third party project has an issue. He goes and strikes up a friendly conversation and gets to the bottom of it. As a final example in this category, Alex has 11 bug fixes landed in musl libc.

Alex loves building a diverse computer collection. He has taken upon himself to increase the different kinds of CPUs and OSs that Zig’s test suite runs on. As of today, the CI runs debug and release variants of each of these targets:

Photograph of computers underneath Alex's desk

A good chunk of those are physically sitting underneath Alex’s desk!

Alex, thank you so much for being who you are and for offering your time, expertise, and power outlets to the Zig project. It is truly an honor to call myself your colleague.