two phone interviews. The first one is a 20-min brain teasers. The second one is more technical. It depends your background. If you have geophysics background, it will be more on the basic concepts of seismology and digital data processing. If you have other STEM background, it will be more basic and some more brain teasers.

first round. in the format of phone or zoom. I was asked some math questions/basic physics questions. Some of them are like middle school math contest questions. Some of the focus on signal processing. I don't remember all of them. But if you are good in high school. you will be fine.