I've built backends with Node/Express, Django, et al.
But recently, I've been using Firebase for my backend (specifically with my React/Redux app) — and I love it!
The Firebase SDKs are a breeze to work with. You have a live db the client can post/respond to, and functions (similar to AWS Lambda) if you need to have something done serverside.
I highly recommend it for consideration, especially if you'd rather focus on the front-end app. :-)