First round is answering some technical questions via an online exercise or a handwritten solution to a technical problem. Depending on the role, you can be asked to come up with an algorithm or calculate characteristics of a physical system.

Standard interview process. First interview was a background check and salary. Technical interview was very heavy on the physics concept than on the computational aspect. They also asked about how you would fit into the company's culture. The fit is a very important part of the interview for them (I didn't really fit with the company's culture since I don't agree with their work ethics).