Unkey built Zen - a thin HTTP framework on Go's net/http. It restores precise middleware ordering and lets middleware run after errors to capture the final response.
Zen pools Session objects to cut allocations. It emits RFC7807 problem+json for tagged domain errors. It runs OpenAPI validation before handlers.
The team prefers a schema-first OpenAPI flow with generated types. They keep external deps minimal. Code lives at github.com/unkeyed/unkey.
