The Care.com Design System, or as we call it internally, the "Pattern Library", existed before me, but I have helped to add to it, refine it, and improve it in my 2 years working there. The main objective of the pattern library is to standardize the design across all platforms and create a unified brand. The vision is that all designers and developers will be able to plug and play components into their products. If the components themselves change, it will be updated universally across the site.
Using Trello, the pattern library team self-assigns specific components that we want to write guidelines on. Once a component is chosen, the designer might do something like the following: