Google Optical Engineer interview questions

Job post had a very limited info, I heard back from recruiter super fast and she told me what expertise they want. that came as a surprise, because if it is something that I can hear right after applying, it can be in job post too and it can avoid wasting time of candidate and recruiter.

HR will provide the required information clearly beforehand and walk you through the possible questions for your reference so you will be able to prepare based on their guidance. More than 3 runs of the interview you gonna go through.