I had the following process:
1. Interview with the company recruiter
2. Interview with the hiring manager
3. Take-home quiz/challenge
The first two rounds were pretty short and quick, basically, it's all about candidate experience, project description, some organizational and soft-skills stuff. Both sides of the process were ok to proceed to the next stage which is their take-home assignment.
It's worth noting that they do not renew their take-home task for several years, yet seems most (if not all) candidates getting the same quiz. Despite I applied for the Software Engineer position with 90% of Go, the quiz/tasks do not contain any questions about it, instead, there is a number of irrelevant language-specific questions on C, Ruby, JavaScript. That said, even if you solve all the questions (7) and code tasks (JS, 2) you still most likely be rejected, as I am, because they seem don't care about your answers, they may judge you're not a good Go developer not asking you a single question about Go, funny.
Don't waste your time on their take-home assignment.