Add features to existing Symfony2 project (2)

** NOTE: This project has now been reposted twice. I am on a tight deadline and I need someone who has plenty of time to devote and is confident and capable with Symfony2. If you can't commit, and can't start right now and provide regular updates, please don't bid :) That aside, if you do a good job, there is plenty of ongoing work available for you. I have an existing billing system written in Symfony2 PHP by another developer. The system works well but I need some new functionality added to it, and since my existing developer is working on some other functionality, I'm looking for a second developer. You can assume the existing system is coded to a high standard and well structured. I need the following changes made: 1. Currently the system supports payment by Paypal and offline payments. I want to expand this to include payment by Amazon, Google Checkout, 2Checkout and Stripe. 2. A new "reports" page should be added, allowing the admin to gather graphical and tabular data about gateway performance, client performance, 1 year financial statement, monthly statement etc 3. Currently the system only supports a single tax band. This should be expanded to allow for any number of tax bands. 4. Currently the system only supports a single currency. This should be expanded to allow for multiple currencies throughout. You will be required to provide updates through Basecamp and publish via Beanstalk as we are working in a team and I need to coordinate people. Some experience with Git is helpful.