Announcing Flow’s $23M Series A, Led by Sequoia
Humanity’s most important machines, reusable rockets, autonomous aircraft, small modular reactors, humanoid robots, and self-driving cars, are being developed faster, safer, and cheaper on Flow.
The next generation of hardware is being built natively on Flow.
With every generation, systems engineering / complexity increases, forcing humanity to change how they work:
The Analogue Era 1940—1980s The Wright Brothers, Apollo, and the Model T. We designed everything on pen and paper. Blackboards. Drafting Tables, Physical Test.
The Digital Era 1980—2020s The 747, the Ford Focus, the Space Shuttle. We moved from paper to software. Drafting to CAD. Blackboards to spreadsheets. Functional complexity grew, but tools kept pace—mostly.
The Iterative Era Today—Future Reusable rockets. Self-driving cars. Humanoid robotics. Today, system complexity has exploded. It’s not just changes in one domain - it's deeply cross-functional engineering.
Iterative Hardware: Bottoms Up, Cross-Functional, Fast
The best engineering teams today operate more like software companies than traditional NASA programs.
They iterate in months, not decades. They work bottom-up, not just top-down. They learn through thousands of tiny build-test-fly loops, not one giant V+V sprint.
This is the Iterative Era. From Waterfall to Agile. From top-down to bottoms-up. From releases in Decades to Months. Iterative Hardware
But there’s a problem: our systems are integrated, while our tools remain siloed. A single change in Excel can ripple into Python, shift CAD, alter COG, and break requirements → stalling entire programs. One tiny missed update can bring a program to its knees.
Flow: The Requirements Tool for Iterative Teams
Flow is a next generation Requirements Tool. It’s purpose built for cross-functional, iterative teams to design, build, test, verify and iterate complex hardware systems massively faster. To bring software development speed to hardware systems engineering.
Requirements have changed. They are now living, breathing Design Criteria: Mass, Temperatures, Pressures, Signals and Interfaces. They are used not just by Systems Engineers - but by every Mechanical, Electrical, Software, Domain Engineer as the source of truth for their current design decisions. These requirements change daily, not annually - and need to be tied deeply into design tools like Excel, Python, Simulation, and CAD.
Flow is becoming the nervous system for iterative teams: an integrated systems tool that sits at the heart of your organization, connecting every change, every decision, every iteration.
In just two years, Flow has become the default platform for next-generation hardware teams.
San Francisco: Flow’s New Home
This is a global movement, but its epicenter is in America. That’s why we’ve relocated our HQ to San Francisco.
We’ve raised $23M from Sequoia Capital, Patrick and John Collison (Stripe) and David Helgason (Unity) to enable next-gen hardware companies to design, build, test and iterate as quickly as software companies.
We’re honored to welcome Roelof Botha, Sequoia’s Managing Partner, to our board and John and Patrick Collison as advisors.
Our mission is simple: Push humanity to design products faster, simpler, and safer than ever before. If you are interested in contributing to it - please reach out directly.
The future of manufacturing is iterative – and it’s being built on Flow.
— Pari & the Flow Team