Wire harnesses may sound boring, but they're critical to every rocket, spacecraft, and vehicle that flies. A startup founded by a SpaceX veteran just secured $65 million in funding to drag this ancient manufacturing process into the 21st century, addressing a problem that has plagued aerospace companies for decades.

Why Are Wire Harnesses Such a Big Deal?

Wire harnesses are the internal electrical cabling systems that run through rockets, planes, submarines, and satellites. They're bespoke, meaning each one is custom-built by hand for its specific application. For years, the industry has relied on the same approach it used during the Cold War: technicians manually assembling wires on wooden tables using largely manual processes.

The stakes became impossible to ignore in 2023 when Boeing discovered that its Starliner spacecraft's wiring was held together with flammable tape. The discovery forced an expensive redesign of the entire wiring system, a costly reminder that outdated manufacturing practices can derail billion-dollar projects.

How Is Senra Modernizing Wire Harness Production?

Jordan Black, who led wire harness scaling efforts at SpaceX while working on Starship production, co-founded Senra in 2023 with Benjamin Shanahan to solve this problem. The company announced its $65 million Series B funding round today, co-led by Lowercarbon and Interlagos, with participation from General Catalyst, Sequoia Capital, Andreessen Horowitz, and Founders Fund.

Rather than eliminating human workers, Senra is modernizing the process through software and selective automation. The company uses a proprietary platform called Amp to standardize inputs throughout the wiring process and create a digital twin that guides technicians. This approach addresses a critical vulnerability in traditional manufacturing: small errors in material tracking or engineering changes can cascade into catastrophic failures.

"Having it all in the same software is probably the most important thing, because it's all the little inputs that happen that can make a catastrophic change down the road," said Jordan Black, CEO of Senra.

Jordan Black, CEO at Senra

Senra also operates what Black describes as the only federally certified wire harness training program, ensuring technicians meet modern standards. The company currently produces 1,000 harnesses per month across two factories and plans to scale to 10,000 per month in 2027.

Steps to Modernize Manufacturing Processes

• Standardize Digital Workflows: Replace manual tracking with unified software platforms that log every material input and engineering change, reducing the risk of cascading errors.
• Invest in Worker Training: Develop certified training programs that elevate technician expertise rather than replacing workers, ensuring quality control at every step.
• Implement Selective Automation: Automate specific tasks where technology is mature while keeping human craftspeople in roles where their judgment and experience add irreplaceable value.

Who Are Senra's Customers?

While Black declined to name specific customers, he indicated that Senra serves a broad range of aerospace and defense sectors. The company's client base includes builders of submarines, maritime vehicles, land-based defense systems, launch vehicles, and satellites. This customer diversity reflects the universal challenge of modernizing wire harness production across the entire aerospace and defense industrial base.

The funding round underscores growing investor confidence in manufacturing modernization, particularly within the U.S. defense industrial base. The surge of capital into American manufacturing infrastructure has created an opportunity for startups like Senra to tackle legacy processes that have persisted for decades.

What's the Bigger Picture for SpaceX and Rocket Manufacturing?

Black's approach reflects a principle he credits to SpaceX founder Elon Musk: "automation is last." The philosophy prioritizes standardization and process improvement before introducing robots, allowing companies to scale production dramatically. SpaceX went from building one rocket per year to producing hundreds annually by first perfecting its manufacturing foundation.

"It goes back to the Elon principle of, 'automation is last.' We're working on it now, but a lot of it the standardization and the foundation building that made SpaceX be able to scale something like rockets, which you could only build one a year if you were lucky, and now they do hundreds a year," explained Black.

Jordan Black, CEO at Senra

For SpaceX specifically, Senra's modernization efforts could accelerate Starship production by ensuring wire harnesses meet quality standards without the delays that plagued competitors. As SpaceX aims to increase launch cadence and reduce costs, reliable, scalable wire harness manufacturing becomes a critical bottleneck to solve.

The $65 million funding round signals that investors see significant value in modernizing unglamorous but essential manufacturing processes. While space exploration captures headlines, the infrastructure that enables it often depends on solving these kinds of foundational engineering challenges.