1 initial recruiter phonecall, 2 video calls with team members. Video calls were both technical and covered topics from controls, dynamics, orbital mechanics, and coding. First call was more of general knowledge test, second call was a specific live-coding question about simulation and modeling

First interview: two engineers, told me about the position, what Astranis does, and what they do. They then asked me to go over my resume quickly and then talk about a project I had worked on relevant to the position, asking me questions throughout. Then came the coding part, and they wanted to make me use a whiteboard to solve a problem but that didn't work (I think because I have a mac) so they went straight to the python compiler. I had to solve a mass-spring damper problem by deriving its equations of motion and then solving for its position and velocity. I wanted to use the scipy integrator library but they didn't let me, which led to my mistakes because I wasn't prepared to do it other ways. When I derived the equation of motion, they claimed I had a sign error but I actually didn't, which made me question the validity and preparedness of the interviewer. Overall, I didn't make it to the second round. Positive experience overall regardless and I wish I could've shown my skills fully.