Please accept this letter as my official two weeks' notice of resignation for the company. While I have thoroughly enjoyed my time here, I feel that it's time to move forward with my career and explore new endeavors.
I would like you to know that this decision has nothing to do with the excellent opportunities you have provided me here. On the contrary, my experience with the company has enabled me to further my skills and focus on my goals, and I genuinely appreciate all your support.
Please let me know if there's anything I can do to ensure a smooth transition. It's been a pleasure working with you.