If your interviewer hasn’t gotten back to you yet, it could mean they’re still interviewing candidates, they haven’t reached a final decision or, unfortunately, you didn’t pass to the next round. However, there’s no need to fret. Only after you send your thank you letter, should you follow up by sending a short and polite message asking for an estimate of when you can expect a decision. If they’re still deciding on candidates, this shows you’re interested in the job, and you’re on top of deadlines.