AI code-testing startup Blacksmith’s valuation jumps almost 10x in less than a year

As artificial intelligence accelerates the pace of software engineering, the industry is facing a new, critical hurdle: the rigorous testing and validation of the massive volume of code being produced. Addressing this challenge, Blacksmith has successfully secured a $45 million Series B funding round, signaling a massive surge in investor confidence.

A Meteoric Rise in Valuation

Led by Peak XV Partners, this latest financing round values the startup at $550 million. This represents a staggering increase from the $60 million valuation assigned just under a year ago during its $10 million Series A. With additional participation from existing backers GV and Y Combinator, the company’s total lifetime funding has reached $58.5 million.

Founded in 2024, Blacksmith has rapidly scaled its operations. CEO and co-founder Aditya Jayaprakash revealed that the company now serves over 5,000 customers—a significant leap from the 700 clients it supported less than a year ago. Notable users include Expensify, Mercury, Supabase, Clerk, and Ashby.

Solving the AI Code Bottleneck

The proliferation of AI-assisted coding tools like Claude Code, Cursor, and OpenAI’s Codex has made generating software faster than ever, but it has also introduced concerns regarding code reliability.

“Validating code is still a bottleneck, and it’s an even bigger bottleneck because people are writing even more,” Jayaprakash noted.

Blacksmith originally launched as a cloud-based provider for continuous integration (CI) workloads, streamlining the builds and tests required before software hits production. The company has since evolved, introducing Codesmith, an AI-powered agent designed to automatically remediate failed code checks.

Scaling Amidst Fierce Competition

The startup’s financial trajectory has been equally impressive. After hitting an annualized revenue run rate (ARR) of $10 million with a lean team of 10, the company has expanded its workforce to roughly 30 employees. While Jayaprakash did not disclose a specific current ARR, he confirmed that revenue has grown to "tens of millions" and highlighted that some enterprise clients are now spending over $1 million annually on the platform.

Despite this momentum, Blacksmith faces a crowded landscape. It must contend with:

• Established giants: GitHub Actions, along with validation services from AWS, Google Cloud, and Microsoft Azure.
• Emerging tech: Native validation features within AI coding assistants and various specialized startups.

To maintain its edge, Blacksmith is focusing on testing speed and cost-efficiency. Looking ahead, the company aims to broaden its ecosystem, evolving into a comprehensive suite of tools that assists developers in writing, validating, and merging software with greater velocity.