Mostly Go. I care about how the runtime works underneath — value/pointer semantics, escape analysis, the GC — and about correctness you can enforce at compile time rather than re-assert in prose. Going deep on Rust.

I run koopa0.dev — a private Go + PostgreSQL personal OS for commitments, learning, notes, and publishing. Agents share the same semantic state through a deliberately small MCP surface; the admin UI keeps high-commitment decisions with me.