hi, I have been magento expert for over 6 years and have much experience in this field. I read your requirement and really interested.I have just fix empty cart issue on this project: https://www.freelancer.com/projects/html/magento-shopping-cart-issue/
I am sure I can complete your project very fast with the best quality. Please contact me to discuss more, I will start immediately, thank you..
Best Regards,