Sticker Mule Senior Full-Stack Software Engineer interview questions

E-mail contact from HR quickly after the application with an invitation for a Hacker Rank coding challenge. You have 75 minutes to complete three challenges, one of them a SQL one. They were quite easy and I finished more than 30 minutes earlier with full marks. Unfortunately, it was a waste of time given that my application was dismissed around a week later without much justification ("we are following up with other candidates"). The best case scenario here is that they are incompetent and didn't do their job: They failed to analyze my CV to find out if I was suitable for the role before sending me a coding challenge and making me waste my time. The worst case scenario is that they are just posting jobs that don't actually exist just to put their name out there or test the waters, so don't waste your time by applying...