It's a service-based company that hires and provides candidates to other companies on payroll. So, don't feel disheartened if you got rejected. I contacted HR and scheduled an L1 round with a senior-level individual. It seems he himself doesn't know Node.js basics. Sometimes he changed the question or asked the wrong question three times.

The interview process was easy and I was selected in 3-4 days and the HR were also very supportive and I did found any difficult in clearing the interview. There no room for improvement as such because all the process was streamlined and no issues were faced by me what so ever