Blacksmith, an AI-powered code-testing startup, has raised $45 million in a Series B round, propelling its valuation to $550 million just months after it was valued at $60 million. The funding round, led by Peak XV Partners, underscores the growing demand for tools that help developers validate the increasing volume of code produced by AI assistants.
The startup, founded in 2024, helps companies build, test, and verify software before it reaches production. In less than a year, Blacksmith has grown from serving about 700 customers to more than 5,000, including well-known tech companies like Mercury, Supabase, Clerk, Ashby, and Expensify. Co-founder and CEO Aditya Jayaprakash said the company’s explosive growth reflects a fundamental shift in software development: AI makes writing code faster, but testing and validating that code has become the new bottleneck.
Why AI code testing is critical
The rise of AI coding tools such as Cursor, OpenAI’s Codex, and Anthropic’s Claude Code has dramatically accelerated how quickly software teams can generate code. However, speed in code generation does not guarantee quality. AI models can produce plausible-looking but flawed code, and the consequences of shipping bugs to production can be severe. As a result, companies are increasingly turning to platforms like Blacksmith to ensure their code is reliable.
“Validating code is still a bottleneck, and it’s an even bigger bottleneck because people are writing even more,” Jayaprakash said in an exclusive interview. This insight has driven Blacksmith’s strategy: rather than competing purely on code generation, the company focuses on the critical step of verification. By automating and speeding up the testing process, Blacksmith helps developers maintain confidence in their code and release faster.
From CI cloud provider to AI testing agent
Blacksmith initially launched as a cloud provider for continuous integration (CI) workloads, which are the automated processes that build and test code every time a developer makes a change. This foundational service allowed development teams to run their software builds and tests in a scalable, efficient environment. But the company quickly realized that the emergence of AI coding agents required a more integrated approach.
To meet that need, Blacksmith introduced Codesmith, an AI coding agent designed to automatically detect and fix failed code checks. Instead of merely flagging errors and sending developers back to the drawing board, Codesmith can analyze the failure, suggest a fix, and in many cases implement it automatically. This proactive capability has proven highly valuable for teams that are inundated with pull requests and need to maintain a rapid release cadence.
The combination of a CI infrastructure and an AI-powered fixer has made Blacksmith an attractive partner for companies of all sizes. Startups use the platform to scale their development processes without hiring an army of DevOps engineers, while larger enterprises leverage it to improve code quality across distributed teams. The company’s customer growth—from roughly 700 to over 5,000 in under a year—shows how quickly the market is embracing the concept of AI-assisted testing.
Revenue and growth trajectory
Blacksmith has also seen impressive financial growth. According to Jayaprakash, the company reached a $10 million annualized revenue run rate with just 10 employees. Since then, the workforce has expanded to about 30 people, and revenue has grown to “tens of millions of dollars,” although the CEO declined to provide a specific updated figure. Some of the company’s largest customers now spend more than $1 million per year on the platform, a sign that enterprise demand is strong.
This lean approach to growth—using a small team to serve a large customer base—has been made possible by the very AI technologies Blacksmith helps validate. Automation handles much of the heavy lifting, allowing the company to maintain high margins while scaling rapidly. Peak XV Partners’ decision to lead the Series B at a $550 million valuation, nearly ten times the previous valuation, signals confidence in Blacksmith’s ability to dominate the AI code-testing niche.
Investor confidence and funding details
The newly announced Series B brings Blacksmith’s total funding to $58.5 million. Existing investors GV (Google Ventures) and Y Combinator also participated in the round, showing that longtime backers remain bullish on the company’s direction. Peak XV Partners, which is one of the largest venture capital firms focused on technology startups in Asia, led the round after extensive due diligence on Blacksmith’s growth metrics and market opportunity.
This funding will enable Blacksmith to accelerate product development, expand its engineering team, and strengthen its go-to-market efforts. The company is not just planning to iterate on its existing product; it has broader ambitions. Jayaprakash said that Blacksmith plans to expand into a comprehensive suite of coding tools, aiming to help developers write, validate, and merge software faster. This full-stack approach could position Blacksmith as a one-stop shop for modern software delivery, rivaling even the largest cloud providers.
Competitive landscape
Blacksmith operates in a crowded and fast-moving market. Its competitors include GitHub Actions, the CI/CD platform integrated into GitHub; Cursor Automations, which brings automation to the popular AI code editor; and the validation capabilities built into OpenAI’s Codex and Anthropic’s Claude Code. In addition, numerous startups are vying for a share of the AI testing market, and hyperscalers like Amazon Web Services, Microsoft Azure, and Google Cloud all offer AI-assisted code testing services.
Despite the intense competition, Jayaprakash believes Blacksmith differentiates itself through two key factors: speed and affordability. Testing code quickly is critical for teams that want to maintain fast feedback loops, and Blacksmith has invested heavily in optimizing its infrastructure to minimize wait times. At the same time, the company aims to offer pricing that is accessible to both early-stage startups and large enterprises.
This dual focus has allowed Blacksmith to grow even as tech giants continue to push into the space. While the cloud providers have the advantage of scale and existing customer relationships, they often lack the singular focus and agility of a dedicated startup. Blacksmith’s ability to integrate across multiple ecosystems—rather than being tied to a single cloud or code repository—gives it a unique advantage.
Future outlook
Looking ahead, Blacksmith is poised to play a central role in the future of software development. The company’s mission is to ensure that AI-generated code is not only written quickly but also tested rigorously, closing the loop between creation and confidence. With funding in hand and a rapidly expanding customer base, Blacksmith is well-positioned to expand its product offerings and capture additional market share.
The next few months will be critical as the company executes on its roadmap. The planned expansion into a broader suite of coding tools could see Blacksmith move beyond testing into areas like code review, deployment automation, and performance monitoring. If successful, Blacksmith could become a foundational layer in how modern software teams operate, helping them manage the increasing complexity of AI-assisted development.
As AI continues to change the software landscape, the demand for robust testing and validation services will only grow. Blacksmith has shown that it can not only keep pace with these changes but also help define them. With a strong product, a proven business model, and the backing of top-tier investors, the company is on track to continue its meteoric rise.
Source:TechCrunch News