Blacksmith, a CI cloud platform providing purpose-built infrastructure for software testing and validation, raised $45 million in Series B funding at a $550 million valuation. Peak XV led the round, with existing investors Y Combinator and GV increasing investments. More than 6,000 companies, including Supabase, Clerk, Ashby and Mercury, currently run CI workloads on Blacksmith.
Scaling CI for AI-Generated Code
Growing adoption of AI coding tools has increased software output and demand for testing infrastructure, with Blacksmith reporting 5–10% weekly growth in CI jobs since the beginning of 2026. The platform focuses on helping developers and coding agents validate changes and merge code faster as AI-generated development expands.
Expanding AI-Powered Development
Blacksmith recently launched [code]smith, a cloud coding agent designed to build features, fix bugs, diagnose and automatically resolve CI failures, and keep pull requests ready for merging. Development plans also include [code]smith QA, an autonomous system for testing software changes before merging.
Compute Expansion and Hiring
The Series B capital will primarily expand Blacksmith’s cloud infrastructure. Blacksmith currently manages hundreds of thousands of compute cores and plans to increase capacity significantly to meet growing demand. Funding will also support hiring across engineering and other functions in New York City and San Francisco.