Blacksmith has raised $45 million to build the quality-control layer for an AI-accelerated software industry. The Series B values the code-testing startup at $550 million, up from $60 million less than a year ago, according to TechCrunch.
Peak XV Partners led the round, with existing investors GV and Y Combinator participating. Blacksmith says it now serves more than 5,000 customers, including Mercury, Supabase, Clerk, Ashby and Expensify, compared with more than 700 customers a year earlier. Its total funding has reached $58.5 million.
Unique insight
The fastest-growing category around AI coding may not be code generation at all, but the systems that stop generated code from reaching production unchecked.
Analysis
Blacksmith began as a cloud provider for continuous-integration workloads, running the builds and tests that validate software before release. It has expanded into Codesmith, an agent that can automatically fix failed checks, while competing with GitHub Actions, cloud platforms and validation features built into Codex and Claude Code. CEO Aditya Jayaprakash says the company reached a $10 million annualised revenue run rate with 10 employees and now generates tens of millions in revenue.
That growth reflects a practical limit on AI coding: writing more code is useful only if teams can review, test and merge it quickly enough. Developers gain faster feedback, but they also inherit a larger verification burden and a higher cost when weak tests allow defects through. In the short term, buyers will compare testing speed and price; over the longer term, the winners will connect generation, validation and deployment without turning the pipeline into an opaque autonomous system. Watch whether Blacksmith can defend its position as major cloud providers fold similar checks into their platforms.
Bottom line — If I only remember one thing tomorrow, what should it be?
AI can multiply the amount of code teams produce, but Blacksmith’s funding shows that proving the code works is becoming the scarcer resource.
- Story type: Important story
- Impact: High
- Confidence: High (official announcement)
- Audience: Developers
- What changed: Blacksmith raised $45 million at a $550 million valuation while expanding from CI infrastructure into AI-assisted code repair.
- What to watch: Whether its customer growth converts into durable usage against built-in cloud testing tools.
- Reading time: 2 minutes
