Promotion is more difficult than finding a job. While in a job interview, you have candidates which are most probably not supposed to stay with you after hiring (If only one vacancy). In the case of promotion, there is a long queue of staff with their achievements, goals, and promotion demands, so competition is tough. You may negotiate salary at the time of getting hired, but asking for salary raise after joining the job, is like asking for a loan.

I do not want to remember that who told me that Hard work pays back. Yes, it pays back but not in...