Flow is a design and test collaboration platform for hardware engineering. The product serves as a core layer for complex, regulated programs, bringing software-style practices—versioning, branching, review, and continuous integration—to mechanical, electrical, and systems workflows. Teams use Flow to coordinate design reviews, testing, and compliance work across stakeholders, shortening cycles and reducing risk as rockets, vehicles, aircraft, and energy systems move from concept to production. Customers include space, defense, automotive, and robotics companies working on high-stakes systems. Flow’s mission is to accelerate the development of next-generation hardware by making agile systems engineering practical at scale. The company operates with a bias toward speed and ownership (“own it, descope it, ship it, iterate”), values hands-on engagement with users (“get on a plane”), and emphasizes mastery of fundamentals. Flow is Series A–backed, with angel investors from Stripe, Figma, and Unity leadership, and maintains a small, product-driven team that ships to production frequently.