Flow Engineering announced a $50 million Series B at a $750 million valuation on 30 September, with Sequoia Capital participating after leading its Series A in October 2025, according to the company’s announcement.
Key points
- Antonio Gracias of Valor Equity Partners and Gavin Baker of Atreides Management co-led the round.
- Roelof Botha made a personal investment and joined Flow’s board as an independent director.
- Flow says use at Rivian grew from 40 to 1,500 people in seven months.
- The company plans to expand its engineering and sales teams and pursue FedRAMP authorisation.
Valor and Atreides lead Flow’s Series B
Gracias, the founder of Valor Equity Partners, and Baker, the managing partner at Atreides Management, co-led the financing, Flow said. The company named Human Capital, Evantic, SV Angel, Odyssey and EQT among the other investors. Sequoia’s participation follows its lead role in Flow’s previous round, giving the company a returning institutional backer alongside the two new lead investors.
Botha joined as an independent director and invested personally, Flow said. TechCrunch described him as a former Sequoia partner and reported that the San Francisco-based company is three years old. Flow also named Hugging Face co-founder Thomas Wolf, Mercedes-Benz chief information officer Jonas von Malottki and Formula 1 world champion Nico Rosberg as individual investors.
Flow is raising the money to develop software for engineering teams working on physical products. Its platform links product requirements with computer-aided design, simulations, software code and tests. The company says agents working across those records can follow design changes, identify effects elsewhere in a project and check whether requirements remain covered by testing.
Flow’s target is to bring hardware iteration cycles down from months to days. That is a company goal rather than a measured result for the customer programmes it named. Flow says a change to one component can require corresponding work across mechanical, electrical and software systems, as well as checks against technical requirements.
Rivian use reaches 1,500 people
Flow says its use at Rivian increased from 40 to 1,500 people over seven months. Engineers at the vehicle maker now make millions of calls to Flow’s application programming interface each week, according to the company. Those figures describe use of the platform rather than the time taken to complete a hardware programme.
Scott Mackenzie, Rivian’s director of product development, process and tools, said in Flow’s announcement that Rivian had assessed 30 tools. He said Flow helped its teams collaborate on systems engineering and develop products faster. Flow lists Rivian among customers using the platform for hardware development.
Flow also names Joby Aviation, Astranis and Radiant Industries as customers. It says General Motors PPU, the Rivian and Volkswagen joint venture RV Tech, Stoke Space, Intuitive Machines and Pacific Fusion joined its customer roster after the Series A. The customer list spans vehicle, aviation, space and energy projects, where engineering work must connect designs to testing and requirements.
Flow directs capital to engineering and sales
Flow plans to spend the Series B proceeds on further development of its platform, including tools for reviewing work, managing branches of a project and evaluating results. It says the work is intended to let AI models operate on engineering information from active hardware programmes. The company also plans to hire in AI and systems engineering and enlarge its sales team.
Regulated customers are another focus for the planned spending. Flow says it will pursue FedRAMP authorisation and other certifications for customers with more demanding compliance requirements. Flow says it plans to develop tools that let AI models work securely with engineering data from active hardware programmes while pursuing those certifications.
The company says it will also add controls to the platform as it develops the review and evaluation functions funded by the round.
