1. You talked too much/too little.
2. You appeared nervous and lacked confidence.
3. Your soft skills weren't so sharp.
4. Your technical skills weren't up to par...
5. Or they were too on point and you were deemed overqualified.
6. The hiring manager felt threatened by your sparkling skills and spot-on experience.
7. You were too vague and didn't illustrate examples when asked behavioral-based questions.
8. Not a cultural fit with the team and organization.
9. Too much of a fit - maybe you appeared overconfident.
10. Your salary requirements were too high.
11. Your references bailed on you and provided not-so-pleasant insight.
12. Your thank-you note had errors.
13. You were too aggressive when following up.
14. You were late to the interview.
15. Or maybe not very polite to the receptionist.
16. It wasn't about you - it was about them, since they went with an internal candidate.
17. They closed the requisition, downgraded it or upgraded it into something else. Or hiring has been frozen.
18. The hiring manager is out of town so all decisions are on hold regardless.
19. You didn't look the part - maybe you dressed a bit informal and the interviewers' read it as you're not taking the position seriously.
20. You threw your current/former employer under the bus.
21. It was simply not meant to be.