I applied online. The process took 4 weeks.
The rounds went as follows:
It was a super smooth experience. They were very prompt and communicative. The questions were mostly behavioral, with some technical questions. I would go through it again.
The following metrics were computed from 1 interview experience for the Lightmatter Project Engineer role.
Lightmatter's interview process for their Project Engineer roles is extremely selective, failing the vast majority of engineers.
Candidates reported having very good feelings for Lightmatter's Project Engineer interview process.