A Rust-powered build engine with persistent caching, content-addressable artifacts, and an AI optimizer that learns your repo. Hot builds in 38ms. Cold builds in 0.84s. CI deploys to 14 regions in 90 seconds.
The build engine on your laptop is the same binary CI runs. No "works on my machine," no surprise differences in production. The CLI is a single 14 MB binary written in Rust install with one curl.
There isn't a magic trick there are three ordinary engineering decisions, taken seriously and finished completely. Rust. A shared cache. A planner that learns.
01
Rust
Compiled, not interpreted.
The graph walker, type-checker, and bundler are all native code in one statically-linked binary no runtime, no node_modules, no interpreter startup tax.
02
Shared Cache
Share the cache, share the time.
Every output is content-addressed by hash. If a teammate already built it, you fetch the artifact instead of rebuilding their Tuesday becomes your Wednesday morning.
03
cash-positive
Predict the next build.
Lumen models your dependency graph and plans the optimal walk order before you hit save — warming the cache for the files you're most likely to touch next.
