Leo Lännenmäki

Founding engineer @ Avrea
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About

Leo is a founding engineer at Avrea. He has over 15 years of experience building backend systems, game engines, and developer tools.

Previously co-founder and CTO at Matchmade, and Senior Software Engineer at Disney Interactive, where he led engineering on multi-platform games shipped on iOS, Android, and Windows Phone.

Posts by Leo Lännenmäki

21 May 2026

How we made GitHub Actions cache up to 6× faster

On GitHub Actions, a 1 GB actions/cache restore takes 14 seconds. On Avrea, the same workflow, same client: 2.9 seconds. Up to 6× faster across cache sizes from 1 KB to 1 GB, with 3× tighter variance.
12 May 2026

Benchmark: Linux kernel builds 3-68x faster on Avrea than GitHub Actions

On GitHub Actions, a Linux kernel build takes 27 minutes 23 seconds. On Avrea, the same build, with the same two vCPUs: 9 minutes 3 seconds, 24 seconds with a warm cache.
11 May 2026

Benchmark: Ghostty builds 3-27x faster on Avrea than GitHub Actions

10m 27s on GitHub Actions. 3m 33s on Avrea without cache. 23 seconds with a warm Nix binary cache. That's 2.9x from the hardware, 27x once caching kicks in.

Your next build can already be a fast one.

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