It all started with a technical challenge. Of which, I solved 3 questions out of 5, because I did not understand the formulation of the remaining two. However, I moved on to the technical interview, where I understood that they were going to explain those 2 missing questions. Instead, they focused on asking me about the optional Mongo db skill. Which was a surprise to me. We then agreed that I was going to take a Mongo db course. I purchased the Mongo db course, successfully completed it and notified them to resume the process. My second surprise was their notification that they had moved on to other candidates without explanations. Despite this, I completed the course. The process was a complete waste of time.