LA-based startup looking for part-time Rails developer for finished B2B app

We're a small start-up looking for a skilled Rails developer to come on board and take the technical lead before we launch.

THE BUSINESS
This is a billing application that helps anyone with a revenue share-based business model manage their partners, contracts and transactions. One customer we're talking to has 1300 partners and 200 million transactions annually. We are mainly targeting new media companies and service providers.

THE APPLICATION
The application runs on Ubuntu, PostgreSQL, EC2 and has one component written in C++ for heavy-duty data processing. You don't have to take ownership of the C++ code, but you will be in charge of everything else. It's less than 10k lines of Ruby code and you should be able to master it pretty quickly. The application is almost finished.

THE TEAM
We are one technical person plus two people in sales and business development. Two of us have 10-15 years experience in telecommunications and billing and are well connected in this space.

THE OPPORTUNITY
We are bootstrapped, but expect to generate revenue pretty quickly because of our unique value proposition. We are going to give you a significant percentage of the equity to come on board now and you will be the first person to get paid once we start making money. We're hoping you can allocate 10-20 hours a week here in the beginning.

You're an experienced Rails developer who writes solid code and can grasp abstract concepts. Since we're juggling other people's money, there are certain parts of the application that just cannot contain bugs. You also have

* at least 2 years experience with Ruby
* basic Unix sysadmin skills and experience with deployment
* extensive experience with databases and a optimizing of SQL
* a strong focus on testing
* ability to communicate well in writing