Blacksmith, a San Francisco startup focused on code-testing infrastructure, raised $66 million in a Series C led by Sequoia, bringing its valuation to $1 billion. The round came two months after a $45 million Series B that valued the company at $550 million, bringing total funding to approximately $124.5 million. Revenue has climbed from a few million dollars to tens of millions, while the customer base grew from roughly 700 to 800 in late 2025 to more than 5,000. Founded in 2024 by Aditya Jayaprakash, Aayush Shah and Aditya Maru, the company provides cloud execution infrastructure and caching tools for GitHub Actions, along with the Codesmith coding agent, which diagnoses and attempts to fix failed tests.
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