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sam reis — open source software engineer

https://sam.dev/

Sam is a Berlin-based software engineer working on open source, with a soft spot for Rust and hard problems in performance and distributed systems.

Writing — sam reis

https://sam.dev/blog

Posts on performance, systems programming and the internals of the open source I work on.

Solving for faster SHA-1 collision detection — sam reis

20 Sep 2026

https://sam.dev/blog/faster-sha1-collision-detection

SHA-1 with collision detection doesn't have to be so slow. How a code generator that moves the checks to SIMD can narrow the gap to plain SHA-1 to ~20–30%.

Speeding up gearhash on ARM64 (2× faster) — sam reis

06 Sep 2026

https://sam.dev/blog/gearhash-on-arm64

The gearhash crate has gained a NEON backend for improved performance. How a direct port started out slower than scalar, and the dependency-chain work that fixed it.