Synechron Senior Java Developer interview questions

I was asked to write two codes in a plane paper sheet.After that I had my first round of interview where I have been asked good java questions: Question asked were: ConcurrentHashMap internal implementation, Producer Consumer Code.Few more coding questions . Later I have been asked to wait for 2nd round and believe me I had to wait almost 7 hours to have my second round. Around 8 Pm I was called for second round of technical discussion.There were two people in the panel (Ravi and Pawan) .Firstly Ravi asked me to describe about my current project which I explained him very well but in between the so called A Technical architect Ravi asked why you have used url in your rest service call and believe me he don't even know this. Later, Pawan asked me ,how to identify whether a linked list is circular or not which I answered him well.Then he asked me one puzzle ,which I was trying to solve in between Ravi laughed and said hey this is the simplest puzzle and I had solved in my college days.They were speaking among themselves that this guy is not studied well in college.I could have told them look at my percentage and then comment but I smiled and kept quite.One matrix traversal question Pawan asked which I answered using two pointers to give best possible time complexity.But the so called Architect Ravi saying why to use two pointers ,you can do it using one pointer ,which was baseless as it will be a linear search so no gain in this iteration.I really doubt about their technical knowledge. My suggestion would be for those guys who actually looking out for a change please don't waste your time attending interview in Synechron as you will not going to learn anything but You will get a chance to meet those unprofessional and no techie guys there.