Hi,
As you see, I'm a new member here. So for now, my highest target is getting the best review from employer, not money.
In fact, I'm a developer with 6+ years experience in PHP and 3+ years experience in mobile and your project is absolutely in my ability.
If you want to have the best product with low cost, hire me!
To manage project, we can use a project management tool like Trello (recommended), Jira, or even Google spreadsheet.
To share source code, we can use bitbucket (recommended), or I'll attach the php script file to a card in project management tool, or simpler, only send them through email.
Everything is up to you, however I just want to say that I can update my work in hours and you can verify them and give me feedback quickly. This will help us to save time and make the quality of work better.
Thanks and Regards,
Cuonghm86