Install Leiningen, if you don't already have it. Make sure you have a MongoDB running on your machine. You can use docker for that:
docker run -p 27017:27017 mongo
Development tasks are wrapped in the ./go script, e.g.:
./go serve-backend,./go serve-frontend,./go serve-styleslaunches development servers for the respective parts of the app. Run these in separate shells in parallel for the best development experience. The app listens on http://localhost:3000./go testruns all tests