B
Blacksmith
High-performance bare-metal runners that accelerate GitHub Actions CI
About Blacksmith
Blacksmith is a San Francisco Y Combinator (W24) developer-infrastructure company founded in January 2024 by Aditya Jayaprakash, Aayush Shah and Aditya Maru (University of Waterloo / Cockroach Labs / Faire alumni) that offers a drop-in replacement for GitHub Actions runners. It runs CI on high-performance gaming-grade bare-metal CPUs rather than rented hyperscaler VMs, claiming up to ~2× faster builds and materially lower compute cost, plus test analytics and observability for Actions workflows. Customers cited in press include Ashby, Chroma, Clerk, Mintlify, Pylon, Supabase and VEED; the company reported roughly $3.5 million ARR with 700+ customers by its Series A. After a $3.5 million seed led by Google Ventures in May 2025, Blacksmith in September 2025 raised a $10 million Series A again led by GV in 14 days, with angels including Cockroach Labs CEO Spencer Kimball and Sentry co-founder David Cramer, to scale the CI platform as AI coding agents multiply build demand. Sources: TechCrunch 17 Sep 2025.
Source: Dealroom company dataKnowledge graph
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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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