When you are about to finish a client project, it is a good idea to prepare a "thank you" email, have it checked and send it to your customer (usually the Product Owner) on the last day. In this email include:
There are a number of reasons why this is important:
Below is a template email you can use:
Thank you very much for your time for the last xxx weeks. I think you must be the best Product Owner I have worked with at SSW (always available for me when needed). I really enjoyed this project.
I believe I have completed all of your most important requirements. I had good look at the source code and while it's fresh in my mind, I thought I might send you the following suggestions that would make it easier for myself and other developers in future:
Improvement Area 1:
Improvement Area 2:
Please feel free to contact us if you have any questions.
Regards, <yourExternalSignature>
✅ Figure: Good Example - Nice 'thank you' email with a list of future improvements