Maximus Sr. Software Engineer interview questions

The interview process was two round 1) is technical, 2) Manager round 1) technical round was virtual and they may ask you write some simple DSA I was interview on Java so they asked me to write code in Java 8 Streams api. 2) manager round : They discuss some of you intrest and role and responsibilities currently you have, And they will check you for the cultural fit. I have did well on both round and also I have received the mail from them that I have been shortlisted for the role and they never release the offer letter. I called many time for the HR, then also no reply If they are not interested of taking in then why should they send the mail for selecting for that role.