How to Resign Professionally
Keep your resignation letter Short, Simple and Positive
Present your boss with a written resignation letter confirming your notice of (typically two weeks) effective immediately and tell him/her simply that:
"Another firm has offered me an exceptional opportunity, and I have accepted it
as I feel it is in my best long-term interests. I appreciate all you and the
firm have done for me here. I want to thank you for the opportunity of working
with you and I hope I can leave with your good wishes."
You have given your best to the job, you will be missed, especially by those inconvenienced by your leaving.
Your boss will likely be caught off-guard by your resignation. Let your boss
know that you intend to assist him/her in whatever way you can to make the
transition a smooth one.
Keep your conversations simple and concise. The more you say, the more
questions you may have to answer.
Avoid discussion about your new opportunity with your old employer to avoid negative opinions.
Do not justify your personal goals and decisions.
Schedule any transition discussions for the following morning when everyone can face your departure after time to absorb and reflect on the news.
Your boss may want to probe for factors which led to your decision.
Constructive criticism is no longer your responsibility, and carries a high cost which could jeopardize your good references.
You want to be perceived as a positive, constructive individual in forward motion. People will remember your last impression.