Initial phone screen asked resume questions. The hiring manager invited me on site at the end of the phone screen. During the on-site, I gave a presentation on my thesis research in the morning and then met with 7 different engineers in the group.They mostly asked me questions about my research and how I would modify various parameters if I were to design a new process based on my research. There were also basic chemistry questions, basic physics and materials science questions, and other random brain teasers.