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

Blacksmith, a platform that helps companies build and test software — including code written by AI — has raised a $66 million Series C led by Sequoia, the company announced Wednesday, lifting its valuation to $1 billion.

Co-founder and CEO Aditya Jayaprakash said he started the company to make continuous integration, the pipeline that builds, tests, merges and validates code changes, less of a burden, arguing in a blog post that most companies can’t keep pace with the volume of CI work AI-generated code now demands. “As agents write more of the world’s software, the question that matters is whether it can be trusted,” he said.

Blacksmith says its annual recurring revenue has grown 17x, and that it has now run more than 90 million individual CI checks for customers including Mercury and Granola.

The new round lands just two months after a $45 million Series B that valued Blacksmith at $550 million — itself a jump from the $60 million valuation it held a year earlier, following a $10 million Series A. The startup has now raised $125 million in total.

Why it matters

Investors are pricing in a future where AI agents write most new code, and Blacksmith’s fast climb in valuation shows how much weight they’re putting on tools that verify that output before it ships.