Flux Raises $37M to Democratize Circuit Board Design With AI

Quick Facts

• Flux raised $37M including a $27M Series B led by 8VC and previously unannounced $10M Series A
• More than 1 million users have designed 6.5 million devices using Flux’s AI-powered PCB design platform
• The startup uses natural language prompts to automate circuit board layout, component sourcing, and testing

AI hardware startup Flux announced $37 million in funding to automate printed circuit board development. The round includes a $27 million Series B led by 8VC, with participation from Bain Capital Ventures, Liquid 2 Ventures, and Outsiders Fund.

Flux also disclosed a previously unannounced $10 million Series A led by Outsiders Fund and co-led by Bain Capital Ventures. The San Francisco-based company has now raised $47 million total since its 2019 founding.

The platform has reached significant user milestones. More than 1 million makers, designers, and entrepreneurs have used Flux to design nearly 6.5 million devices, ranging from wearables to robots to smart home controllers and drone navigation systems.

AI-Powered Design Automation

Flux positions itself as the world’s first AI hardware engineer. The platform uses natural language prompts to work with users on circuit board layout planning, component sourcing, and design testing. It outputs manufacturing-ready specifications.

“Historically, building hardware has been insanely difficult,” said CEO Matthias Wagner. “When you’re working with atoms instead of electrons, everything costs more and takes longer. Those limitations have always kept hardware in the hands of an elite few.”

The company serves diverse use cases. One customer built an IoT tool for construction machinery without hiring an electrical engineer. Another ships custom electronics across Africa. A third designs organ-on-chip platforms for drug discovery.

Market Opportunity

The PCB design software market was valued at $4.32 billion in 2025 and is expected to reach $12.11 billion by 2033, growing at 13.77% annually. AI integration represents the biggest market opportunity for routing automation and design optimization.

“We wrote Flux’s first check when they were only a few founders with an audacious vision to transform hardware design,” said 8VC partner Francisco Gimenez. “Their market is not simply electrical engineers designing PCBs. It’s the universe of makers from individuals to businesses to whole industries.”

Wagner previously worked as a product manager at Meta on projects including AR ads and Oculus VR. The startup took about five years to reach revenue, according to both Wagner and Gimenez.

Flux plans to use the funding to extend its AI capabilities to more complex electronic use cases. The company is backed by notable angel investors including Figma board member John Lilly and GitHub founder Tom Preston-Werner.

Read more: Flux nabs $37M to automate printed circuit board development with AI