I'm an expert Python programmer, and would be happy to work with you. I have a lot of experience with the technologies your specify - async programming, MySQL and the sqlalchemy ORM - as well as experience coding financial packages (including point of sale, inventory management, and project cost accounting applications).
However, your project description does not provide any information about the scope of the work to be done, only that there's a minimum investment of 2 hours to test and qualify for the job, and that your budget is $1000. Your call for a "back end developer" implies this code will be part of a web application, but it's unclear whether we're talking about an entire application, or new features added to an existing application, or even behind-the-scenes tools that crunch data.
With so little to go on, I have no real basis for choosing an amount to bid. After I pass the qualifying test, we would have to discuss the project in some more detail - and I might have to adjust my bid - before I could accept the project.