Hello,
my name is Josef, i'm professional freelance developer from Czech Republic, and i would like to offer you my services.
I understand your requirements for this project and long-term opportunity. To summarize my experience with Magento: i understand all underlying technologies both as programmer and system administrator, i completed at least few dozens Magento projects that required detailed know of Magento module, theme system, implementing 3rd party services and modules, bugfixing, long-term maintenance and development. I have start with Magento about 10 years ago, so i have decent overview of the whole field and can provide you with full-stack developer / administrator services.
If you have any question or considering me for this project, don't hesitate to contact me by private message. I'm looking forward to hearing from you soon.
Kind regards,
Josef
PS: My hourly rate is $20 USD / hr, and i can work both on hourly / milestone bases, but i prefer working by milestones.