Building the CI cloud: our Series C

Blacksmith announced a $125 million total funding milestone following a Series C led by Sequoia Capital at a $1 billion valuation, with participation from Premji Invest, Peak XV Partners, GV, and Y Combinator. The company positions its cloud-based continuous integration platform as infrastructure for the growing volume of software builds and tests generated as AI coding agents accelerate development, citing Anthropic’s reported 25-fold CI job growth over six months as an indicator of the trend. Blacksmith says it helps companies run highly variable CI workloads faster and without managing their own infrastructure, serving customers including Mercury, Granola, Handshake, and LangChain. Since January, its weekly CI jobs reportedly rose from 5 million to more than 90 million while annual recurring revenue increased 17-fold, and it plans to use the funding to expand its team and compute capacity from nearly 10 MW across U.S. and European data centers to five times that footprint by 2027.

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