Flow Engineering raises $50M Series B at $750M valuation for AI-powered hardware design

Flow Engineering, a San Francisco-based startup providing AI tools for hardware design, announced on September 30, 2026 that it has raised a $50 million Series B round at a $750 million valuation.

The round was co-led by Antonio Gracias of Valar Equity Partners and Gavin Baker of Atreides Management. Sequoia Capital, which led Flow's Series A in October 2025, also participated, along with former Sequoia partner Roelof Botha, who invested as an individual and joined Flow's board.

The three-year-old company uses AI agents to automatically align CAD drawings with product requirements, simulation results and other testing data. Its customers include Anduril, Rivian, Joby Aviation, GM PPU, RV Tech, Stoke Space and others.