I applied online. The process took 3 months.

• The first step is a 30-minute remote interview.
• The second step is a take-home code challenge where you are supposed to use any functional language, but there are bonus points if you pick Clojure. I was asked to write a job queue management algorithm, with input and output through stdin/stdout and JSON as the data format. You have one week to finish it.
• The third step is a second code challenge where you are supposed to build upon the first solution. They asked me to write a REST API with endpoints for the second algorithm. I wrote a beautiful REST API with Swagger documentation and tests.

It was not considered functional enough because I've used a database. It looks like they use some tool where the people evaluating your solution are not the same people interviewing (I guess he does not know who he is evaluating) so he would not have any context. Even if you make it work, you are at the mercy of some random engineer (maybe even junior to you) arbitrarily judging how you named your functions. At this step, I think they should not expect the candidate to guess their code-style conventions, and their feedback is quite condescending. In fact, I feel like there is something else going on, but they are unable to say for fear of a lawsuit (in Brazil, it is illegal to run some kinds of background checks like credit checks, but many banks do it anyway—too bad if you were a victim of identity theft or something like that because you will not have a chance to explain).

General questions about career.