I use Moleculer as the backend for a very data-heavy project, it handles the load far beyond my expectations, seamlessly processing as many as 500 concurrent updating events every 15 seconds.
Microservices framework's pick #1!
Moleculer simply does everything right!
The best part of it is that it doesn't overwhelm you with heavy setup or low learning curve. Everything you need to know to put your hands on will take you approximately a 20 minutes. And after that it always backs you up in your development.!
Been using moleculer for about a year now and have enjoyed every minute of it. Icebob, the maintainer, is very responsive and actively maintaining this product.
I used it for a least a year now, it's the best experience i had with a backend solution !