Blacksmith raises $45 million in Series B led by Peak XV at $550 million valuation; total funding reaches $58.5 million

Blacksmith, founded in 2024 by Aditya Jayaprakash, Aayush Shah, and Aditya Maru, has raised $45 million in a Series B funding round led by Peak XV Partners, bringing its total funding to $58.5 million. The company aims to enhance its cloud platform for running GitHub Actions continuous integration (CI) workflows.¹²³⁴

The startup's platform claims to run CI workflows up to twice as fast while costing 50%-75% less than traditional GitHub-hosted runners. Blacksmith's customer base has surged from 700 to over 6,000 in less than a year, serving notable clients like Mercury, Supabase, and Expensify.

The funding will be used to expand its computing infrastructure to meet the rising demand for tools that can test and validate AI-generated code. The number of CI jobs run on its platform has increased by 5%-10% week-on-week since early 2026, driven by the growing adoption of AI code generation tools.

Blacksmith has also launched Codesmith, an AI coding agent that can automatically fix failed code checks, and is developing Codesmith QA to autonomously test code changes before merging. The startup competes with other platforms like CircleCI and Buildkite as it continues to innovate in the AI coding space.