AI code testing platform Blacksmith has raised $45 million in its Series B funding round led by Peak XV Partners, per an announcement.
The funding also saw participation from existing investors, including Y Combinator and GV. With the fresh infusion, Blacksmith has attained a valuation of $550 million.
“Most of the new capital goes to compute. Blacksmith manages hundreds of thousands of cores today and plans to grow that footprint by an order of magnitude in the coming months to stay ahead of demand,” Blacksmith said in a statement.
Founded by Aditya Jayaprakash, Aayush Shah and Aditya Maru, Blacksmith builds infrastructure and software for validating code. Its purpose-built CI (continuous integration) cloud runs GitHub Actions workloads on dedicated compute with caching and storage optimised for CI.
“Writing code has gotten dramatically easier. Validating it hasn’t,” said Aditya “JP” Jayaprakash, co-founder and CEO of Blacksmith. “We’re seeing teams adopt coding agents, generate several times more pull requests, and suddenly CI becomes a bottleneck. Every piece of code an agent writes must be built, tested, and reviewed before it can ship. That validation layer is going to become increasingly important as agents write more software.”
In a statement, Blacksmith said it started with purpose-built infrastructure that runs CI workloads dramatically faster than general-purpose cloud instances, with migration taking a one-line change to a workflow file. While that remains the foundation, the broader goal is helping developers validate and merge code faster.
The company recently launched codesmith, a cloud coding agent developers can delegate tasks to. Beyond building features and fixing bugs, codesmith works inside the validation loop: diagnosing CI failures, autofixing them, and keeping pull requests green.
At present, Blacksmith claims to serve over 6,000 companies, including Supabase, Clerk, Ashby and Mercury, up from approximately 800 when the company announced its Series A last September.
