Check out solutions that use React here. Interested in something else? See the full list of technologies here.
Google provides several powerful APIs which can greatly enhance your app if you are able to take advantage of them. See one such example here, where we upload audio files into Google Speech Recognition API to generate transcripts, using a Python Django backend. View on Github
It can be hard for clients to care about your data unless they can see it. Chart.js provides an easy to use, yet powerful API to display your data quickly and elegantly. Check out an example of how to use it to display Google Analytics data View on Github