The process is long and frustrating. HR basically would not respond to your email. Some interviewers are truly not professional.
However, the interview pipeline and the whole process is pretty good I would say.
The topics included system design, OOP, and a few behavioral questions.
The following metrics were computed from 29 interview experiences for the Circle Software Engineer role in United States.
Circle's interview process for their Software Engineer roles in the United States is extremely selective, failing the vast majority of engineers.
Candidates reported having negative feelings for Circle's Software Engineer interview process in United States.