A San Francisco startup building AI tools for the people who design rockets, cars, and drones just landed a fresh $50 million at a $750 million valuation. Flow Engineering announced the Series B round on Wednesday, a jump that underscores how fast investors are betting artificial intelligence can reshape the slow, paperwork-heavy world of physical product development.
The round was co-led by Antonio Gracias, founder of Valor Equity Partners, and Gavin Baker, managing partner at Atreides Management, according to a Flow Engineering announcement. TechCrunch also identified Gracias as being with Valor Equity Partners. Sequoia Capital, which led Flow's earlier Series A, returned for this round alongside Human Capital, Evantic, SV Angel, Odyssey, and EQT, per the company's announcement.
The round also drew a notable lineup of individual backers: Hugging Face co-founder Thomas Wolf, Mercedes-Benz CIO Jonas von Malottki, and Formula 1 world champion Nico Rosberg all contributed, the company said. Sequoia partner Roelof Botha joined Flow's board as an independent director and made his own personal investment in the company, according to the same announcement.
What Flow Engineering Actually Builds
Founded in San Francisco in 2023 by Pari Singh, Flow Engineering builds what it calls an agentic systems-engineering platform, software meant to help hardware teams design, build, and iterate on physical products the way software teams ship code. The platform links requirements, CAD files, simulation data, code, and test results into what the company describes as a living system of record, and its AI agents continuously analyze engineering changes, flag downstream impact, and check requirements and test coverage across existing tools.
Flow's founder has argued that despite decades of rising product complexity, the fundamental tools and workflows of hardware engineering have barely moved, telling Fortune that the processes involved “haven't fundamentally changed since the space race.” Botha has made a similar point about where the industry is headed, telling Fortune that “hardware isn't separate from software at this point, but rather increasingly defined by its intersection with software.”
Rivian's User Count Jumped 37-Fold in Seven Months
The company points to its work with electric-vehicle maker Rivian as an early proof point. According to Flow's announcement, Rivian's engineer adoption of the platform grew from 40 users to 1,500 in just seven months, and Rivian engineers now run millions of API calls on the platform each week. Flow says thousands of engineers at companies including Rivian, Anduril, General Motors, Joby Aviation, Astranis, and Radiant are now building on its system, while a related TechCrunch report also names General Motors' PPU division, RV Tech, and Stoke Space among its customers.
That adoption curve lands against a broader backdrop documented in a 2024 survey of 250 hardware engineers, cited by Contrary Research, which found that 23% of engineering time was spent on non-value-added work — the kind of friction Flow says its agents are designed to strip out.
From $23M Series A to a $750M Valuation
Flow's climb has been fast. The company previously raised a $23 million Series A led by Sequoia Capital, a round that also drew Odyssey Ventures, Unity co-founder David Helgason, and Stripe co-founders Patrick and John Collison, according to Yahoo Finance's earlier report on the deal. Less than a year later, the company has more than doubled that round's backing and multiplied its valuation many times over.
With the fresh capital, Flow says it plans to expand its review, branching, and evaluation capabilities and grow its engineering team across both AI and systems engineering, according to its own announcement, as first detailed in reporting by FinSMEs. The company also says it intends to pursue FedRAMP authorization and other certifications aimed at customers in regulated industries, though it has not said when that process might be complete.
