Blacksmith, a software infrastructure provider, successfully closed a Series C funding round, raising $66 million. The leadership of this round secured Sequoia Capital at a company valuation of $1 billion. Premji Invest also participated in the round, along with existing investors including Peak XV Partners, GV, and Y Combinator.
This is the ninth funding round for Blacksmith. With the new capital, the total investment in the company has reached $125 million. The funds are planned to be used for expanding the team and increasing computing power. The Blacksmith platform is used for continuous integration (CI), and the company claims that 10,000 companies use its platform.
Continuous Integration (CI) automatically builds and tests code whenever a developer makes changes to the code repository. This allows teams to detect issues early before product release. The growth in development volume creates additional load on traditional infrastructure.
Blacksmith was founded in 2024 by individuals such as Aditya Jayaprakash, Aayush Shah, and Aditya Maru. The founders met while studying at the University of Waterloo. Their main goal is to accelerate and reduce software testing costs.
AI-based coding tools are transforming the software development process. Although AI tools can quickly generate code, this code still requires verification, which puts increased strain on systems responsible for building and testing applications. Traditional cloud infrastructure often struggles to scale when CI workloads change, as demand can jump sharply from near zero to tens of thousands of CPUs.
Blacksmith developed its infrastructure specifically to support CI workloads. Clients can make just one change to the workflow configuration, and Blacksmith handles all the work of providing and maintaining runners without client involvement in the setup process. Among the company's clients are Ashby, Granola, Handshake, and LangChain. Blacksmith's infrastructure covers data centers in the US and Europe, and the company manages capacity approaching 10 megawatts. It plans to increase this base by at least five times by 2027.
This expansion is intended to support the growing demand from engineering teams performing a higher volume of automated tests. Weekly CI jobs on the platform have increased from five million in January to over 90 million. Furthermore, Blacksmith reports a 17-fold increase in its annual recurring revenue over the same period. Infrastructure engineer Joaquin Borggio reported that LangChain benefited operationally from the service, as Blacksmith allowed them to reduce runner costs by approximately 40% and save engineering time by reducing infrastructure management.
The new capital will be used by Blacksmith to build its infrastructure to accommodate changing workload types it can handle in software development. The team also plans to scale up capacity and increase staff to serve a wider customer base. While AI-based coding agents can accelerate software production, quality assurance is necessary. Accelerated testing can become a bottleneck in the development pipeline, but it facilitates more frequent releases. Blacksmith will face competition from major cloud providers and developer tools.
The company's future development will depend on performance, infrastructure cost control, and customer demand. This latest funding demonstrates that investors remain optimistic about infrastructure supporting AI-driven software development.



