San Francisco-based Blacksmith, a provider of cloud infrastructure for building and testing software code, raised $66 million in a Series C funding round led by Sequoia Capital at a valuation of $1 billion.
The round included participation from Premji Invest and existing investors Peak XV Partners, GV (Google Ventures), and Y Combinator. The investment brought Blacksmith’s total funding to $125 million.
Founded in 2024 by Aditya Jayaprakash, Aayush Shah, and Aditya Maru, Blacksmith develops infrastructure designed specifically for continuous integration (CI) workloads. Its platform enables software development teams to automate code builds and testing without managing the underlying computing infrastructure.
Blacksmith offers managed runners for GitHub Actions, allowing developers to execute CI workflows on computing infrastructure optimized for these workloads. According to the company, its platform completes CI jobs twice as fast and at 60% lower cost on average compared with conventional alternatives.
The company reported that its weekly CI workload increased from 5 million jobs in January 2026 to more than 90 million by October, while annual recurring revenue grew 17-fold over the same period.
Blacksmith said its infrastructure serves more than 10,000 companies, including Ashby, Granola, Handshake, and LangChain. It manages nearly 10 megawatts of computing capacity across data centers in the United States and Europe.
The new capital will support team expansion and additional computing infrastructure. Blacksmith plans to increase its compute footprint by at least five times in 2027 to accommodate growing demand for automated code validation.
Before the Series C, Blacksmith announced a $45 million Series B led by Peak XV Partners in August 2026. The company said that financing had been raised in March 2026 at a valuation of $550 million.
