Probably drones and sensor-companies also qualify but don't really know much about that industry.
SpaceX's reusable rocket is a great example of technology risk and so is Tesla's affordable electric car.
Most startups today don't take these types of risks, SaaS is well-understood. The risks these companies take (in the eyes of investors) are in matching product features to the market and profitable go-to-market.
If you want all management to defer to engineers and their needs then you need to seek out a company where the success of those engineers will make or break the company.
That said, I think product and businesspeople are often not aware that having really solid tech yields dividends for years to come and will help them outcompete any peer as well increase the acquisition likelihood. Saas-companies should have a strong engineering culture, but unfortunately it's not a requirement to be a successful company in this category.