Recruiter had a quick phone call to determine fit, then arrange a phone screen to be followed by on-site interview. The whole setup for phone screen has nothing to do with finding the advertised Senior/Staff/Principal position since all the questions were all basic type questions. The interviewer gave decision based on code syntax details rather than understanding of core logic or allowing for concept and implementation pros and cons discussion, which is more fitting for Staff/Principal position. If you just need a senior coder, advertise accordingly.