I already have a one step page checkout module however I would like to replace it for another onepage checkout module That I will provide to you. It is localized to Brazil. Payment gateway is brazilian as well so I will provide you with integration information as well. The actual module is already integrated so that might help you. Also some tweaks will be done after installation to look like the checkout page of another store that I will provide you.
A staging area should be created to work on the project and the milestone will only be released after testing is done.
Pls be competitive.