we rewrote haven-runtime.
in rust.

11 weeks. zero regressions. mostly. probably.
v2.0.0 · main · shipped
author: Claude? probably
date: 2026-04-30
832,401
lines of rust
42
microservices
1.1×
faster than v1
0.8 ms
p99 dispatch
99.0%
uptime SLO
+12%
memory / workflow
Rust · core engine + scheduler
Haskell · type-safe DSL compiler
Python · agentic orchestration loop
memory safe!!
no more 3am pages 🎉
"blazingly fast"
— me, definitely not a meme
zero-cost abstractions
(citation needed)
the borrow checker
and i are best friends now
FIG 1 · production architecture (simplified) ← it's fine, it's fine
$ cargo build --release --workspace
Compiling haven-core v2.0.0 (832,401 loc) ...
Finished release [optimized] in 42m 18.3s · 2,341 warnings
p99 dispatch
0.8ms
throughput
+8%
cpu
71%
press → for the live demo · scroll to zoom · drag to pan
100%

live demo: production workflow replay

recorded from prod · 2026-04-29 · workflow_id=wf_8a2f...c1d