A resignation letter should have a proper letter format and be written in a professional and positive tone. Use a professional font such as 12-point Arial or Times New Roman.

This letter serves as my official two weeks’ notice for my resignation from my position as Senior Engineer here at ABC Company. My final day of work will be March 15, 2022.

Salutation: Your resignation letter, like any other formal document, must start with a salutation which is an obvious and proper way to begin a formal letter.