So your designer need this fancy technology called SASS in order to keep sanity in the CSS file maintenance. Cool. You can either buy him a nice editor that doesn’t the auto-compiling, or you can setup a docker container to do so in the development machine.
The workflow is simple: the container watches the SASS sources folder, and when something changes, it compiles and output the files to the CSS folder. You just have to place a proper config file, and ready to go!