Aug 21, 2018 - 11:34 AM
After the interview, you should always send a thank-you email within 24 hours. If you hear nothing back after a week, then it is acceptable to contact the hiring manager again asking about the progress of the hiring process. Make sure to be polite with this email. If you do not hear anything at that point, then it is best to let it go.
There are numerous reasons why a hiring manager will express interest in hiring you only to fail to follow through. While it is a frustrating aspect of the job hunt, you can at least know you had all the necessary qualifications and will do better next time. Since you made a good impression at the company this time, you can apply for any future job openings later.