Keystone Solutions MEan Stack Developer interview questions

one phone call with interviewer, then brief technical interview followed by a call the same day to do for a in site interview, the second day i was declined. the recruiter just asked me about my performance, salary requirements and other minor things to see if i was a fit, then forwarded my information to the lead programmer who gave me a call next day. they asked me some basic to some difficult technical questions just to make sure you know your stack