The startup that checks AI-written code before it reaches production has pulled in a $45 million Series B at a $550 million valuation.
Peak XV Partners led the round for Blacksmith, with GV and Y Combinator also participating. Total funding now stands at $58.5 million, and the valuation is roughly ten times the $60 million mark from a Series A raised less than a year ago.
Founder and CEO Aditya Jayaprakash argues that code generators like Cursor, OpenAI’s Codex, and Anthropic’s Claude Code made writing code easy and checking it hard, calling validation the real bottleneck now that teams produce more code than ever. Blacksmith began as a cloud provider for continuous integration and has since added Codesmith, an agent that fixes failed checks on its own.
Customers have grown from about 700 a year ago to more than 5,000, including Mercury, Supabase, Clerk, Ashby, and Expensify. Revenue reached a $10 million annualized run rate with 10 employees, and the team of about 30 now counts several customers spending over $1 million a year. Rivals include GitHub Actions, Cursor Automations, and cloud testing services from AWS, Microsoft Azure, and Google Cloud.
