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Blacksmith
High-performance bare-metal runners that accelerate GitHub Actions CI
About Blacksmith
Blacksmith provides a cloud platform for running GitHub Actions continuous integration (CI) workflows, positioning itself as a fast drop-in replacement for GitHub-hosted runners. The service runs CI jobs on high-performance bare-metal CPUs rather than conventional cloud VMs, which the company says roughly doubles build speed while cutting compute cost, and it adds observability features such as log search, test analytics and failure triage for CI pipelines. Founded in 2024 by software engineers from Cockroach Labs and Faire, the company graduated from Y Combinator's Winter 2024 batch and is backed by Google Ventures, Peak XV and Sequoia. Engineering teams switch to Blacksmith with a one-line change to their workflow configuration, keeping their existing GitHub Actions while gaining faster runners, caching, machine definitions and a command-line interface for managing jobs and usage. As AI coding agents multiply the volume of code that needs to be built and tested, Blacksmith's infrastructure serves thousands of companies including Supabase, Clerk, Ashby, Chroma and Mintlify, and the company reached a $1 billion valuation with its Series C round in late 2026.
Source: Dealroom company dataKnowledge graph
More headlines
Funding history
Company financing events and reported valuations.
| Deal type | Date | Amount | Valuation | Investors | Source |
|---|---|---|---|---|---|
| SERIES B✓Equity / VC | Aug 2026 | $45M | $550M | Y Combinator · GV · Peak XV Partners | ↗ |
| SERIES A✓Equity / VC | Sep 2025 | $10M | $40M | GV | ↗ |
Financials
Revenue, earnings and other financial measures where available. Years marked “E” are estimates.
Growth signals
Latest recorded traffic for Blacksmith is 190K monthly website visits, up 18.8% over the last three months. Blacksmith's team grew 100% over the past year.
Open positions
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Investments and acquisitions
Recent portfolio relationships for companies that also act as investors or acquirers.
Investors
From Dealroom's funding and investor records, grouped by the round each investor first entered.
Seed5 investors entered at this stage
Y Combinator
GV
Spencer Kimball
Peter Mattis
Richard Aberman
Series A1 investor entered at this stage
Source: Dealroom Talent Intelligence.
Global footprint
team presence
Market sentiment
An AI-synthesised read of the highest-engagement posts about Blacksmith on X, ranked by likes and reposts, corporate channels excluded.
Reading the room on X — pulling top posts and synthesizing themes…
Source: X recent search ranked by engagement (likes + retweets) · Synthesis by Claude · Cached for 1 hour
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