Blacksmith Software raised $45 million to scale its cloud-based code validation service, which automatically tests and commits code submitted by developers and AI agents.
As more agentic AI tools generate large volumes of code, the validation bottleneck is becoming critical; Blacksmith's codesmith agent operates inside the validation loop to diagnose failures and fix them automatically.
The company's user base has grown from 800 companies to more than 6,000 in the past year, and job volume is increasing 5–10% week over week.
What happened
Blacksmith Software raised $45 million in Series B funding led by Peak XV Partners, with Y Combinator and GV also participating, bringing the company to a $550 million valuation. The company recently launched codesmith, a cloud-based coding agent that automates code validation, testing, and integration—moving beyond feature-building to diagnose and fix failures inside the validation loop.
Why it matters
As developers increasingly adopt agentic AI tools like Claude Code that auto-generate large amounts of code, the validation and testing step has become a bottleneck. Blacksmith's service lets entire developer teams submit code simultaneously and have it tested and committed automatically if it passes, solving a problem co-founder Aditya Jayaprakash describes: "Writing code has gotten dramatically easier. Validating it hasn't." The validation layer will become more critical as more software is written by agents.
What to watch
Blacksmith manages hundreds of thousands of compute cores today and plans to grow that by an order of magnitude in the coming months. Jobs running on its service have grown 5% to 10% week over week since the beginning of the year, and the company now serves more than 6,000 companies (up from about 800 at its Series A last September), including Supabase, Clerk, Ashby, and Mercury Systems.
Blacksmith Software announced a $45 million Series B funding round on August 12, 2026, led by Peak XV Partners, with existing investors Y Combinator and GV continuing their participation. The round values the company at $550 million and will be directed toward compute infrastructure expansion.
The company's core service is a continuous integration platform that combines code development with cloud-based testing rather than testing on a developer's computer. In recent months, Blacksmith launched codesmith, a cloud-based coding agent that moves beyond traditional feature development and bug fixes. According to the company, codesmith works inside the validation loop itself—it diagnoses integration failures, automatically fixes them, and either commits new changes to the codebase if they pass or rejects them and sends notes explaining what went wrong. The entire developer team can work simultaneously, submit changes collaboratively, and have Blacksmith test submissions as they arrive.
The funding comes at a time when agentic AI tools such as Claude Code and Codex are generating large volumes of code automatically, creating a new pressure point in the development workflow. Co-founder and Chief Executive Aditya Jayaprakash said: "Writing code has gotten dramatically easier. Validating it hasn't. Every piece of code an agent writes still has to be built, tested and reviewed before it can ship. That validation layer is going to become increasingly important as more software is written by agents."
Blacksmith currently manages hundreds of thousands of compute cores and plans to increase that capacity by an order of magnitude in the coming months to meet expected demand. The company reports that jobs running on its service have grown between 5% and 10% week over week since the beginning of the year. Its customer base has expanded significantly: more than 6,000 companies now use the service, including Supabase, Clerk, Ashby, and Mercury Systems, compared to about 800 companies when Blacksmith announced its Series A in September of the previous year.
Blacksmith's Series B funding arrives at a moment when the software development workflow is being fundamentally reshaped by agentic AI. Tools like Claude Code and Codex now generate substantial code automatically, but that code must still pass validation, testing, and integration checks before it can ship. Blacksmith identified this as the new bottleneck: co-founder Aditya Jayaprakash frames it as a gap that will only widen as more software is written by agents rather than humans. By moving validation into the cloud and automating the test-commit-or-reject cycle, Blacksmith removes friction from a process that previously required developers to wait for local test runs and manual reviews.
The rapid growth in Blacksmith's customer base—from 800 companies to more than 6,000 in a year—and the steady week-over-week increase in job volume suggest that the market recognizes this problem acutely. The company's plan to increase its compute capacity by an order of magnitude indicates confidence in near-term demand. Peak XV Partners' leadership of the round, alongside continued participation by Y Combinator and GV, signals investor belief that code validation for agentic workflows is a durable, high-leverage problem for a growing number of development teams.
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