LCOS R&D Engineer applicants have rated the interview process at Lumentum Operations with 3 out of 5 (where 5 is the highest level of difficulty) and assessed their interview experience as 100% positive. To compare, the company-average is 60.7% positive. This is according to Glassdoor user ratings.
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The interview was pretty simple, mostly behavioural questions, some questions on the LCOS product itself so make sure to study up on that. Typically two engineers/managers will interview you, and more often then not, you will end up working with one of them closely.