Co-Founder
Blacksmith
Blacksmith is a CI cloud that serves as a drop-in replacement for GitHub Actions runners, delivering 2x faster job execution at 33% lower per-minute cost. The platform runs workloads on bare-metal gaming CPUs with top-tier single-core performance, co-locates cache artifacts in the same data centers where jobs run, and persists Docker layers on NVMe drives for 40x faster builds. Trusted by over 10,000 organizations including Supabase, Clerk, and Mercury, Blacksmith processes more than 90 million CI jobs weekly.
- Developer Tools
- Software Only
Updated 13 days ago
Funding
Raised to date
$125MRaised to date based on public sources. This may differ from the amount the company actually raised and is based only on what is publicly available on the internet.
across 5 rounds
PM+1$66M · Series C
Announced Oct 2026 · from article date
Disclosed cumulative: $125M
5/5
RoundDateAmountValuationInvestors
Founders
Product
Problem
Standard GitHub Actions runners are slow and expensive, forcing engineering teams to wait extended periods for builds and tests to complete. Self-hosting CI infrastructure on hyperscalers like AWS introduces provisioning delays, forced storage bundling, and operational overhead that becomes a productivity bottleneck as teams scale.
Solution
Blacksmith is a CI cloud that serves as a drop-in replacement for GitHub Actions runners, delivering 2x faster job execution at 33% lower per-minute cost. The platform runs workloads on bare-metal consumer gaming CPUs with the highest single-core performance, which is the primary bottleneck for compilation and test tasks. Blacksmith co-locates cache artifacts in the same data centers where jobs run, achieving 4x faster cache downloads, and persists Docker layers across CI runs on NVMe drives for 40x faster builds. The platform also provides an observability console that surfaces failing and slow jobs, enables global log search across all CI runs, and posts inline logs of failed tests as GitHub comments.
Target Audience
Primary customers are software engineering teams at startups and enterprises that rely on GitHub Actions for CI/CD and need faster feedback loops without managing their own infrastructure. The platform serves over 10,000 organizations including Supabase, Clerk, Ashby, Mercury, Granola, Handshake, and LangChain.
Features
- Bare-metal gaming CPU infrastructure with top-tier single-core performance for 2x faster job execution
- Co-located cache artifacts enabling 4x faster cache downloads without cross-region latency
- Persistent Docker layer caching on NVMe storage delivering 40x faster Docker builds
- Observability console with global log search, job performance tracking, and inline failure logs posted to PRs
- Support for Ubuntu x64, Ubuntu ARM, Windows x64, and macOS M4 runner types
- Add-on options including sticky disks, static IPs, and Docker layer caching with per-GB monthly pricing
- Instantly provisioned microVMs that absorb spiky CI workloads from zero to tens of thousands of CPUs