Interviewing is a tricky thing. I have been on both sides of the court, and it is very difficult to get a good idea about a candidate's potential simply from the resume/cover letter.
If you keep getting contacted by companies for interviews, but fail to get past that stage, I would recommend two things.
1. Make absolutely sure that your resume is accurate. If, in the interview, it looks like you 'embellished' your qualifications on your resume a bit too much, it is guaranteed to get you tossed into the 'no' pile.
2. Work on your interview skills. It is surprising how bad some people interview. It took me a couple practice tries before I really became comfortable with the process.
If you keep getting contacted by companies for interviews, but fail to get past that stage, I would recommend two things. 1. Make absolutely sure that your resume is accurate. If, in the interview, it looks like you 'embellished' your qualifications on your resume a bit too much, it is guaranteed to get you tossed into the 'no' pile. 2. Work on your interview skills. It is surprising how bad some people interview. It took me a couple practice tries before I really became comfortable with the process.