Blacksmith

Blacksmith is a San Francisco-based developer-tools startup building a high-performance CI cloud. Its drop-in replacement for GitHub Actions runners boots each job into a Firecracker microVM on bare-metal gaming CPUs, letting engineering teams run their pipelines up to 2x faster at roughly half the cost. Backed by Y Combinator and Google Ventures, Blacksmith serves thousands of engineering teams - including Vercel, Supabase, Mercury, Clerk and Ashby - and pairs raw compute with observability and security tooling built specifically for CI workloads.