Not a hardware startup per-se, but we are ex-satellite engineers who out if frustration with available tooling have developed the engineering software every hardware engineer deserves: https://www.valispace.com
Oh sweet, hey Valispace. I can vouch for this software as a spacecraft integrator. I worked with it a few years back as part of a trial and the power of inputing real world hardware measurements of equipment back into a system and see the impact of the measurements system wide is very powerful.
While it is aimed at the spacecraft industry, I can see any industry with concurrent engineering taking advantage of this sort of system.
I have found this software to be very unintuitive with bad UI/UX, unfortunately. The utility of the software is good amd it fills a vital gap for concurrent engineering, but UI/UX needs to be improved badly.
Also just released the first hardware engineering ai assistant: https://youtu.be/uLEOPpqiUok