2 and a half weeks after I applied I received a Ruby coding test, with apologies for the late reply. The task was to calculate foreign exchange rates for a specific date. I got a test file, a json file, and an empty module where I had to write the method. The instructions claimed that you shouldn't spend more than a couple of hours on it, but it involved reading up on Ruby classes/modules, raising exceptions, conventions, testing, and making difficult design decisions to make sure changing the source of the data wouldn't cost much. Despite being presented as an easy exercise to "serve as something to discuss with the hiring team", and the graduate role itself not requiring any actual experience in Ruby, the reviewers were very harsh. My code passed all their tests, and I actually went beyond that to create a class that would use the logic. I was told that my clean code, structure, and good naming were appreciated, but got rejected because my code "would need some work" should the data source change. I also didn't add tests for the extra code I wrote, as I had already spent a lot of time on the exercise, and I felt that was beyond the point. I enjoyed doing the exercise, but expecting someone who applies for a graduate role to write perfect code based on conventions they might not fully be aware of is ridiculous. It also took them 5 weeks to review my code, and they changed the job ad in the meantime to make it more restrictive.