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The project runs with React and hot replacement of changes to the modules.
CSS files loaded into components are locally scoped and you can point to class names with javascript. You can also compose classes together, also from other files. These are also hot loaded. Read more about them here.
To turn off CSS Modules remove it from the webpack.config.js file.
Both Node server and frontend code runs with Babel. And all of it is linted. With atom you install the linter package, then linter-eslint and linter-jscs. You are covered. Also run npm run eslint or npm run jscs to verify all files. I would recommend installing language-babel package too for syntax highlighting