Infosys Senior Systems Engineer interview questions

It has 3rounds. 2 Technical rounds and 1 HR round. For technical the questions are from HTML,CSS,JAVASCRIPT, REACT AND REDUX. 1.what is hooks and expalin the hooks you have used? 2.how redux works? 3.useMemo,use Callback 4.Libraries for API call

there were 2 round 1) Aptitude test 2) interview my interviewer was friendly and asked me about JAVA and OOPS concepts. It was easy. Well after clearing the interview, there was a background verification process and I submitted all the documents, but after 6 months i heard from them, i got offer letter, I sent mail on 2nd June 2021 and I got an offer letter on 22 Nov 2021. there was no communication in between.