Senra Raises $65M Series B to Pull Wire Harnesses Out of the Cold War Era

Senra, the startup modernizing how wire harnesses are built for rockets, satellites, submarines, and defense vehicles, has raised a $65 million Series B co-led by Lowercarbon and Interlagos, with participation from General Catalyst, Sequoia Capital, Andreessen Horowitz, and Founders Fund, among others. It is a blue-chip syndicate for what might sound like the least glamorous product in aerospace — and that contrast is precisely the story. The electrical cabling that forms the nervous system of every complex vehicle is still built the way it was during the Cold War, and an elite group of investors is betting the company that fixes it becomes indispensable.

The Deal at a Glance

Founded in 2023 by Jordan Black and cofounder Benjamin Shanahan, Senra traces directly to Black's time as a SpaceX engineer, where he took on the job of scaling wire harness production for Starship. The experience sent him traveling the world visiting harness companies — and what he found was an industry frozen in time. Senra's answer is not to replace the craftspeople who build harnesses but to surround them with modern software: its proprietary Amp platform standardizes inputs across the entire wiring process and produces a digital twin that guides technicians through each build.

The company already produces 1,000 harnesses a month across two factories and plans to increase output tenfold — to 10,000 a month — in 2027. While Black could not disclose customers, he described them as builders of everything from submarines and maritime vehicles to land defense systems, launch vehicles, and satellites. The breadth matters: Senra is positioning itself not as a space supplier but as the modern harness layer for the entire defense industrial base.

Why Wire Harnesses Suddenly Matter

Wire harnesses are exactly what they sound like: the internal electrical cabling that runs through a rocket, car, plane, or tractor — and they become more important as those vehicles get smarter. They are bespoke products, assembled by technicians who function as experienced craftspeople. And when they go wrong, they go wrong expensively. In 2023, Boeing discovered that its Starliner spacecraft's wiring was held together with flammable tape, forcing a costly delay while the entire wiring system was redone.

Black points to exactly that kind of failure as the reason to raise standards. His argument is that harness quality is a process-control problem: catastrophic outcomes trace back to small, untracked inputs — a material substitution here, an engineering change there. Having everything in the same software, he says, is the most important thing, because it is all the little inputs that can make a catastrophic change down the road. Amp exists to make every one of those inputs visible, tracked, and consistent.

People First, Automation Last

Senra's approach is deliberately contrarian to the robots-replace-everyone narrative. Manipulating flexible wires remains genuinely hard for robots, and the training data to teach them is scarce. So Senra keeps humans in the loop — trained through what Black says is the only federally certified wire harness training program — while using software and targeted automation to modernize the work around them: materials tracking, engineering change management, digital-twin work instructions.

The Investor Signal

Senra is riding the surge of capital into U.S. manufacturing, particularly the defense industrial base. The demand backdrop is unambiguous: munitions production is being expanded, shipbuilding is straining, launch cadences are climbing, and satellite constellations are multiplying — and every one of those vehicles needs harnesses. A supplier that can deliver them faster, with digital traceability, into a market where the incumbent alternative is a wooden table, has structural tailwinds few component categories can match.

The BlacKnight Take

Senra — the name, Black jokes, is 'harness' spelled backwards minus the letters that spell what the company is removing from the industry — is a case study in where the space economy's real opportunities now sit. The glamour layer of the industry is crowded; the process layer is wide open. The founders who win the next decade will look like Black: operators who lived a scaling bottleneck inside a prime or a SpaceX, left, and built the modern version of the supplier they wished existed.

Two things are worth watching. First, the 10x production ramp to 10,000 harnesses a month by 2027 — scaling a craft-labor process tenfold while holding aerospace quality standards is the hard part, and the software thesis will be proven or broken there. Second, the breadth of the customer base: by serving submarines, land systems, launch, and satellites simultaneously, Senra diversifies away from any single program's timeline — the classic merchant-supplier advantage. If the ramp holds, the least glamorous product in aerospace may quietly become one of its best businesses.

Frequently Asked Questions