1st step was to take a Codility test, where I got a good, but not perfect score. They've sent me an email explaining that I could take another attempt with the same link to improve my score AND that my current attempt would not count, with a hint about the algorithm, which I could use. After investigating the topic a bit I've managed to find the perfect solution and scored 100%. 2nd step was a generic interview with an engineer about my expectations, experience and approach, where I've presented business and goal oriented approach with focus on the code quality - basically what every senior developer who's serious about the business knows and does. The interviewer was professional and seemed rational. A couple of days later I've received an email with a rejection and no feedback. Not even a word, despite perfectly fitting their job (or actually being overqualified).

The process started with an automated email asking to perform a code challenge in Codility platform. There were 2 algorithms test: array jumping indexes and a fibonacci calculation. After completing the test I got an email from HR responsible with the results (which were not that good) with a thorough explanation and evaluation giving me a second chance to improve my response. Also some tips and hints were given, which was nice from the company to do so. I then improved my result and got it passed this phase. The next step is when things derailed. I was interviewed by a Lead developer from the team this position was opened. He came prepared for doing an interview focused on the backend side of the development, and even said this position would require at least 60-70% of backend. Let me repeat here the title of the position was FRONTEND/FULLSTACK. They messed up my application or were not clear with the job title and description for the position which is also bad. After this interview, I got 2 weeks of radio silence until being rejected (from a different HR person) with a generic message saying that at this time my skills and abilities were not exactly matching what they are looking for. Of course, you list a FRONTEND/FULLSTACK position and focus your interviewer to look for a backend developer.