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.