Blacksmith Raises $45M Series B at $550M Valuation

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Blacksmith has raised $45 million in a Series B led by Peak XV Partners, with existing backers Y Combinator and Google Ventures returning. The round values the company at $550 million, close to ten times where it stood under a year ago.

The San Francisco company sells cloud infrastructure for continuous integration, the automated build and test cycle that runs every time a developer changes code. Blacksmith executes GitHub Actions workloads on dedicated compute, with caching and storage designed specifically for how CI behaves rather than for general purpose workloads.

The performance claim is the sales pitch: up to twice the speed of GitHub hosted runners at 50 to 75 percent lower cost.

Growth has followed. More than 6,000 companies now run on Blacksmith, among them Supabase, Clerk, Ashby and Mercury. At its Series A last September the number was roughly 800.

That curve has an obvious driver. As more code is written by AI, more of it needs validating, and the volume of CI runs at a typical software company has climbed accordingly. The California company sits directly in the path of that growth.

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