Loka Software Engineer interview questions

The technical part of the interview consisted of a challenge and a review with a senior developer. Spent more than 2 work days to complete the challenge. A reviewer was very happy with my solutions. I had only positive feedback from him. Later I got rejected with a generic email with no feedback. I don't mind getting rejected, but giving some feedback would be a professional thing to do, regarding the time spent on my side. In the end a gigantic waste of time. Even cost me money since I had to deploy on cloud services to complete the challenge and had to pause some other work.