Blacksmith

Developer Tools · Cloud Infrastructure · AI

Funding

Blacksmith hits $1B valuation with Sequoia-led $66M Series C

AI coding tools let developers write code almost instantly, but validating that code has become software teams' real bottleneck.

• Blacksmith raised a $66M Series C led by Sequoia Capital, valuing the CI-cloud startup at $1B just two months after a $550M Series B.
• Blacksmith runs cloud infrastructure that builds and tests code (continuous integration) faster than general-purpose clouds, serving teams like Mercury, Granola, Handshake and LangChain.
• Most of the new capital will fund more compute: Blacksmith plans to grow its data-center footprint from just under 10MW today to five times that by 2027.
• Weekly CI job volume on Blacksmith grew from 5 million in January to over 90 million, ARR climbed 17x, and its customer base roughly doubled to more than 10,000.
• Anthropic reported a similar surge, saying its own code-validation workloads grew 25x in six months as Claude began generating most of its code.
• Blacksmith plans to grow from about 40 employees to roughly 75 by year-end as it scales operations after the raise.
• As AI tools make writing code nearly instant, validating that code has become the new chokepoint, fueling demand for dedicated CI infrastructure like Blacksmith's.