Need App designer with Mac and skills in Sketch -- 2

I am looking for a designer who works on Mac and has licensed version of Sketch. Have an existing mobile app design in place and need some modification to it by adding transition screens, pop up screens, loader screens, changing text etc. need a quick turn around as the work is pretty straight forward, you will get instructions on what to do, the color combination, icons and everything is already there in the existing sketch design so you do not have to design anything new in terms of icons, tabs or anything but just making amendments and adding transition screens and few loading screens to complete the flow. The file with change instructions along wit Balasmic wireframe for more clarity will be shared with the selected person. Please share some of your work on App design done using Sketch. After review you can share fixed cost for the work to be done.