Hi,
I have 7 years of experience in development of Java web applications and from last around 4 years i am mostly working with GAE. I have extensive experience with GAE and have developed many successful application on GAE using Java.
I have experience to work with datastore api, JDO and Objectify. I can do the required changes and can also work with you on other projects for long term. Other than that i have worked with almost all GAE features and Google services.
I don't have a strong profile here because I mostly work on other freelance portal and trying to build some long term work relations over freelancer.
My hourly rate is $20/hr, please send me more detail so that i can give you estimate of work.
If you want i can show you sample of my previous work or can arrange a small demo for you, i can also have a quick skype call to discuss it in more detail.
Please feel free to ask anything, looking forward to hear from you.
Thanks