There are three modules.
On the first module, the user logs in (via Twitter) and fills a brief signup questions, accepting terms of service and confirming its email address, as well as captchas. Once done, user has an option for submitting a quiz daily, to be sent by its twitter followers. Twitter followers may signup and answer questions, awarding credits to his friends.
On the second module, there is going to have a Swoopo/Telebid-like auction using those credits. There is a need to list prizes as well as participants notifications.
On the third module, there is a service desk where user may request for support.
Winner has an option to waive the need to develop the bidding backend (likely to be done in Java), if not confident about the need for fairness when done in bare PHP
English speaking skills are required. Brazilian Portuguese is a plus