I applied online. The process took four weeks. There were typically three rounds, but there was a different position that they wanted to consider me for, so there was a fourth round.
They give you problems that you could face in the position you are applying for and want to understand your thought process behind solving those problems. There is a general vibe check as well throughout the multiple rounds.
The following metrics were computed from 1 interview experience for the Commonwealth Fusion Systems Manufacturing Engineer role.
Commonwealth Fusion Systems's interview process for their Manufacturing Engineer roles is extremely selective, failing the vast majority of engineers.
Candidates reported having very good feelings for Commonwealth Fusion Systems's Manufacturing Engineer interview process.