SpaceX Structures Intern interview questions

Typical questions about Statics and Mechanics of Materials: Fixed wall with an aluminium beam in between. The beam is heated, what happens inside the beam at and the walls? How would you optimize a beam, which is fixed to the wall at one end, for a vertical load at the very end? What is happening at the wall due to the vertical load? How would you optimize a beam for a torsional load?

The most difficult question the question on buckling which I had not learned yet. For that reason the interviewer asked me to piece together the equation for buckling load from intuition.