Dear John,

I hope this email finds you well. I wanted to take this opportunity to express my gratitude for all the hard work I have been able to accomplish last 3 years at this company. I feel I have made a significant contribution to the backend team, and I am confident that I am ready to take on a bigger role and more responsibilities.

Therefore, I am writing to formally request a promotion. Thank you for considering my request. I look forward to hearing back from you soon.

Sincerely,
[Your Name]
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