I have just recently completed a Masters in Economics course with a large component being statistical analysis including specifically difference-in-difference analysis. In addition, proficiency in STATA was a requirement as it was necessary to complete course assignments and term projects. Thus I think you will find I am ideal for such a project.
If you are interested, I can provide a sample of a previous assignment I have completed in STATA as a demonstration of the quality of my work.
Regards,
Chris