The process took 2 weeks. I applied through agents. First, there is a hackerank test, including 4 exercises: API handling, DSA, SQL and K8s. The test took 150min at least. The DSA exercise was awful, a lot of hidden "edge" test cases and the problem didn't describe clear enough. but the other three are simple, maybe at easy level. Second is a system-design take-home assignment. I was asked to use company techstack which is listed on some speakerDeck slides. But I didn't because it's not my strong point, I choose my most familiar techstack to create a document (and have to write it in Japanese anyway). I tried to keep my ideas at the "concept" level (not tied to any techstack) so that anyone can understand what I'm writing One week later after submitting, I receive feedbacks that because I didn't use their techstack, I was failed, and my non-functional requirements was not good even though I listed up all their items written in the assignment. They even asked for a lot of function that's not described in the assignment so if anyone is about to apply to this position, please do more than what you see in their document :)