I worked at Righthand Robotics back when it was < 20 employees (now post-Series C) in 2017. I did an "externship" at the startup in January of my senior year, and stayed on to work part-time during my senior year.
During my time, I designed a proprietary sensor for their soft robotic grippers, by investigating the physics background and theory, building experimental test set-ups, and creating a software simulation to inform future designs. I learned a ton about working in a real startup environment and also got to work hands-on with firmware and electrical engineering for the first time as well.