When your job interview is over, give yourself the best chances of moving forward by doing the following:
Ask about next steps
After your interview, it's appropriate to ask your interviewer, hiring manager or recruiter about what you should expect next. This will likely be a follow-up email with results from your interview, along with additional requirements like an assignment, reference list or another interview.
Send a "thank you" letter
If your interview is in person, ask for the business card of each person you speak with so you can follow up individually with a separate thank-you email. If you interviewed in the morning, send your follow-up emails the same day. If you interviewed in the afternoon, the next morning is fine.