“I just want you to know I really enjoyed working with you. Thank you for plowing through with me, for all the late nights and last minute messages to get things right”

“Excellent work, i really appreciate your help, u did a great job”
“Great job, and thanks for helping me with this project”

“Sincerely share that in your work you are very enthusiastic and responsible, and you also have a good product design mindset. I look forward to seeing you reach your full potential in your area of expertise.”