Xavi Simpson

my resume github.com/xaskii twitter.com/paper1837
email: contact(at)xaskii.com

I like systems programming. This summer, I'm interning at Cloudflare in Austin.

Last summer, I worked on the Pyrefly (a Python static type checker and LSP) team at Meta/Facebook in NYC, improving the internal notebooks experience.

Before that, I interned at Datadog, helping build out IAM and authentication for the web platform. Before that, I interned at Caseware, improving CI/CD and other monorepo-specific tooling.

personal software

rasitop showing CPU and GPU activity, temperature, fan speed, and system power

rasitop

View on GitHub ↗

a low-overhead macOS system monitor for Apple Silicon, with a Rust backend built on Mach, AppleSMC, and IOReport, plus a native Swift/AppKit interface.

This averages ~0.05% CPU (per-core)(trying to bring this lower…) over a 30-second profile. I use Nix and mini benchmarks to track overhead as I add stuff I want.

Rust · Swift · AppKit · Nix · inspired by macmon and Stats