English (TOEIC) and character test.
Interview with the manager, then an HR member.
Hiring or not is mostly dependent on the manager's choice, but HR will advise if there are any concerns.
Or you might need to interview with higher-level managers if needed.
But the final decision will be up to HR's comment if they don't buy into this choice.
Character and attitude are more important than what you can do. They mostly focus on candidates from tier-one schools (NCHU, NTU, NCKU, ...).
The following metrics were computed from 6 interview experiences for the TSMC Principal Engineer role.
TSMC's interview process for their Principal Engineer roles is incredibly easy as the vast majority of engineers get an offer after going through it.
Candidates reported having very good feelings for TSMC's Principal Engineer interview process.