Cognizant Robotic Process Automation RPA Developer interview questions

Appeared for the first round of interview. Everything went too smooth. Even received positive feedback from interviewer upon reaching out externally. But HR said panel has rejected. Didn't get reply from HR, didn't even received the calls post interview. Worst experience ever.

Round 1 : Aptitude online test , it was not very difficult can solve previous papers of companies and attempt Round 2: Technical Face to face of 45 minutes was very basic abput oops concepts, sorting algorithm, favourite data structure, whote box testing and black box testing ROund 3: HR interview telephonic round