Unique process. But had an odd, sketchy ending (more on that later). First step is to submit various technical and/or behavioral questions that is reviewed anonymously by the team members. There's no place to submit your resume. This was a refreshing change from the usual interview process. Second step is an in-depth technical (+ some behavioral) interview with current employees. Again, they don't ask about your experience or background. They only care that you can do the job solidly, which is an approach that I commend them for. Third step gets a bit weird. The PM contacted me, and I was asked to do a take-home test where I improve one of their code in development, with the stipulation that I keep the details secret. It was no rote coding question; rather, it required deep thinking about the program and creative solutions. I diligently research, alter, document my code and submit. Several weeks go by without any feedback. When I finally ask for feedback, they say my application was denied... after the second step! I got detailed feedback on what went right or wrong in the in-person interview portion, but no mention of the take-home test at all. Rotten companies often take advantage of hard-working applicants to steal their ideas using purported take-home tests. I cannot say for certain that Proton.ai was one of them; however, the structure of the interview was odd and I have an inkling that they may have been. Some take-home tests are genuinely interested in how candidates solve a complex problem. Unfortunately, too many companies use this shady tactic to steal ideas. I'm lucky to be in a position where I am sufficiently in-demand to deny requests for take-home tests like these, which has been my policy ever since.