Flow Engineering, a San Francisco-based startup developing artificial intelligence tools for hardware design workflows, has closed a $50 million Series B funding round at a valuation of $750 million. The company made the announcement on Wednesday, revealing backing from a group of prominent investors in the venture capital and hedge fund space.

The round was co-led by Antonio Gracias through Valar Equity Partners, a firm widely recognized for its significant investments in companies associated with Elon Musk, most notably SpaceX, and Gavin Baker of Atreides Management, a hedge fund that has also placed bets on Musk-linked ventures as well as AI chip company Cerebras.

Also participating in the round was Sequoia Capital, which had previously led Flow Engineering's Series A round last October. Notably, former Sequoia partner Roelof Botha joined the round in a personal capacity as an individual investor. Botha has also taken a seat on Flow's board of directors as part of the investment.

Addressing a Complex Challenge in Hardware Design

Founded three years ago, Flow Engineering is focused on solving one of the more persistent pain points in physical product development: the complexity and time demands of hardware design. The company offers AI-powered agents that are built to automatically reconcile CAD drawings with product requirements, simulation outputs, and various testing results - a process that has traditionally required significant manual effort and coordination across engineering teams.

By automating the alignment between design files and the broader set of technical constraints that govern a product's development, Flow aims to reduce friction in the hardware engineering pipeline and accelerate the path from concept to production-ready design.

A Growing List of High-Profile Customers

The startup has attracted a notable roster of clients spanning defense, automotive, aviation, and aerospace sectors. Among the companies currently using Flow Engineering's platform are:

• Anduril Industries, the defense technology company known for developing autonomous systems and hardware for national security applications
• Rivian, the electric vehicle manufacturer
• Joby Aviation, a company developing electric air taxis
• General Motors PPU, a joint venture between General Motors and TWG Motorsports
• RV Tech, a joint venture formed between Rivian and Volkswagen
• Stoke Space, a rocket development company working on fully reusable launch vehicles

The breadth of industries represented among Flow's customers reflects the wide applicability of AI-assisted hardware design tools, particularly as companies across sectors face increasing pressure to shorten development timelines and manage the growing complexity of modern engineered systems.

With the new funding in place, Flow Engineering is positioned to expand its platform capabilities and deepen its footprint across industries where hardware design bottlenecks remain a significant operational challenge.