Shore interview questions

1st round: Quiz round 2nd round: Case study with 3 problems. Was given 1 week to submit 3rd round: HR 4th round: Tech All of this took 1.5 months. And in the end I was greeted with an automated rejection email addressed to me as "{!candidate.firstName}", stating that this position was filled. That's it. No legitimate reason for the rejection. I emailed the HR for a feedback from the tech round but got no reply.