With $50M Series B, Flow Engineering bets AI can collapse hardware dev cycles

Flow Engineering, the startup applying AI to hardware validation and verification, has raised a $50M Series B at a $750M valuation. The round was co-led by Antonio Gracias of Valor Equity Partners and Gavin Baker of Atreides Management. Sequoia Capital, which led Flow's Series A, is doubling down, with Roelof Botha investing personally. New backers include Hugging Face co-founder Thomas Wolf, Formula 1 World Champion Nico Rosberg, Mercedes-Benz CIO Jonas von Malottki, Human Capital, and Evantic.

Flow's pitch is that hardware development has not kept pace with product complexity. The company's Systems Engineering agents monitor changes across CAD, Git, simulations, and docs, then run impact analysis, flag conflicts, and detect requirement failures. Flow says this collapses hardware development cycles from months to days, letting minor changes be integrated and verified daily. It calls the approach AI V&V — validation and verification.

Customers span both frontier hardware startups and industry incumbents. Anduril, Joby, Stoke Space, and Rivian are named as users, and Flow says it is now the default platform for requirements and verification for frontier hardware teams. General Motors' PPU and RV Tech — the Volkswagen and Rivian joint venture — are reshaping their core development practices with Flow's AI. In the past 12 months, the company built and scaled its San Francisco HQ, launched Flow v3, deployed agents in real hardware programs, and won industry leaders in space, aero, autonomy, defense, and energy.

CEO Pari Singh frames the raise around a broader shift. "AI has transformed software development. Hardware engineering is next," she writes. Singh argues that engineers spend 90% of their day-to-day execution time on digital manual labor — CAD, spreadsheets, simulation — and predicts that within the next year, AI will move from integrating the work to doing the work. She compares Flow's culture to the Skunkworks philosophy, with tight, elite teams and ownership lying with the engineers closest to the work.

The round arrives as AI reshapes engineering workflows across industries, and Flow is positioning itself at the center of that change for hardware teams. With its Systems Engineering agents already deployed in live programs at companies like Rivian, Anduril, and Joby, the new capital gives Flow a substantial war chest to press its advantage as hardware iteration starts to move at software speed.