They reached out to me on LinkedIn. 3 rounds 1st Hr call went well. 2nd Technical interview went well. 3 rd Code assessment - take home assessment took me 3 hrs addressed all the criteria and submitted the output with the created code. But after a week HR updated me I am not shortlisted. So I reviewed the code again and asked them for feedback. He mentioned I missed to address the nested data fields. I updated the HR that the code addresses the nested data fields. Anyway the reason they gave me for my rejection was not very clear.