Analysis
Blacksmith, the continuous-integration startup that buys and installs its own servers instead of renting capacity from AWS, Google Cloud or Microsoft Azure, has raised a $66 million Series C led by Sequoia Capital at a $1 billion valuation, Fortune reported Oct. 21.
The round lands two months after an August raise valued the company at $550 million, and less than a year after a Series A valued it at just $60 million -- one of 2026's fastest climbs to unicorn status.
How Blacksmith got from $60M to $1B in under a year
Blacksmith runs continuous integration -- the automated builds and tests code must pass before it ships. Pulse previously covered the company's $45 million Series B, led by Peak XV Partners (the renamed Sequoia India and Southeast Asia funds) with Y Combinator and GV participating, which closed in August at a $550 million valuation, according to Inc42. At the time, the company managed hundreds of thousands of compute cores and said it planned to grow that footprint by an order of magnitude. Two months later, Sequoia Capital's U.S. fund led the Series C at nearly double that valuation.
Blacksmith's bet is structural, not just financial: rather than renting virtual machines from the cloud giants, it buys physical servers and installs them in data centers worldwide, writing its own software to run them. That puts it in competition with AWS, Google Cloud and Microsoft Azure's own CI offerings, and with GitHub, which sells hosted runners directly to the same developers. Longer term, AI coding tools themselves -- Cursor, OpenAI's Codex and Anthropic's Claude Code -- are also potential validation-layer threats if they begin running their own test loops natively instead of handing jobs to a third party.
The growth numbers explain the valuation jump. More than 10,000 companies now run on Blacksmith, up from about 5,000 in August, including Granola, Handshake, Supabase and LangChain. Validation checks rose from 5 million a week at the start of 2026 to 90 million a week, and annual recurring revenue grew 17x over the same stretch to reach the tens of millions, with its largest customers now spending more than $1 million a year. Total funding to date stands at roughly $124.5 million.
For infrastructure investors, Blacksmith is a bet that AI-written code creates more testing demand, not less -- every additional AI coding assistant generating pull requests adds validation volume rather than removing it. That's a distinct thesis from the app-layer AI wrapper plays VCs have grown wary of funding, and it explains why a firm like Sequoia would pay up for a second look at a sector it already backed once through Peak XV.
However, the capital intensity that gives Blacksmith its margin advantage is also its biggest risk: owning data-center hardware outright means its balance sheet looks more like a cloud provider's than a typical venture-backed software company's, and a slowdown in AI-coding volume would leave it holding depreciating servers rather than simply scaling back cloud spend. It's also not yet clear whether its roughly 40-person team, growing toward about 75 by year-end, can keep pace with demand without the reliability stumbles that plague fast-scaling infrastructure startups.
Blacksmith plans to use the new capital to keep expanding its server footprint across its San Francisco and New York operations. Whether AWS or Google Cloud respond with cheaper dedicated CI offerings of their own -- rather than ceding the category to a two-year-old startup -- is the next test of whether Blacksmith's infrastructure bet holds up at scale.
