Need a flutter/dart developer looking for longterm work

I have several flutter/dart projects we need assistance with. What we need is a developer who is able to work very fast, and work well with other developers who are working on the projects as well. We use github and slack for collaboration. It will be very helpful if you know how to conceptualize (imagine) the projects in your mind instead of just take simple instructions. Its also helpful if you know react as well as flutter, and dart...
We need somebody to start immediately, as it is morning USA time