The other reviews on the site are accurate. There are two technical interviews. They will ask you about your projects and tangential questions that you should be able to answer if you were an active member on the project.
The biggest piece of advice I can give you is to be honest. If you don't know something, explain your thought process and why you think X could be a possible answer. They want to know that you understand how to think, not that you can get the answer 100% right.
You need to design a beam that will take a compressive load. What factors do you need to know to design the beam?
What are the biggest concerns?
What properties do you need to determine to design it?
The following metrics were computed from 1 interview experience for the SpaceX Spring Structures role in United States.
SpaceX's interview process for their Spring Structures roles in the United States is incredibly easy as the vast majority of engineers get an offer after going through it.
Candidates reported having very good feelings for SpaceX's Spring Structures interview process in United States.