Accelerated by Claude Code, leashed tightly by unit and integration tests, and test-driven development.
Speaking as a compiler and kernel expert, the productivity boost for domain experts is real.
Compiler status: Full C99 compliance, test suites pass, alpha-beta stage, starting to test on Gentoo and open source package builds "real world builds"
Posixutils status: Very close to 1.0 (all POSIX utils, all POSIX util features, tests pass)