Answered by Stephanie, Hiring Expert at AT&T Inc., on Monday, March 19, 2018
Ah yes, the thank you note. Well, do you want to separate yourself from the pack? Do you think people appreciate gratitude? Do you want to remind a recruiter or hiring manager why you are the best person for the job? Those all seem like legit reasons to write a quick thank you note/email.
I have always appreciated the follow up and that the initiative was taken to make the gesture. And why not! You want this job, let them know how awesome you'll be as a new employee!