You just rocked that job interview and now it is time to write the perfect thank you letter or email. Fact: Writing a thank you email or letter after that interview is everything. You update your resume, search for a job, work to land an interview, and then you rock it. You leave the building and thank your lucky stars the hard part is over—the rest is in the company’s hands, right? Wrong. You have one more step post-interview. The thank you note.