“In response to requests about how I set up a design system for a team of designers to use, documenting the system guidelines, and responsive design in Sketch, I created this resource…

The Sketch download demos a responsive UI, featuring a small subset of form elements and text styles…” by Andrew Couldwell

Behind the scenes in Sketch

Behind the scenes of a design system by @andrewcouldwell: https://dribbble.com/shots/3347202-Behind-the-scenes-of-a-design-system