Googles cloud - Firebase
It is very good for small projects requiring low usage for free
Note; Check out their pricing for higher use here https://firebase.google.com/pricing/
Firebase uses Java script
This YouTube by RoboShala is a great place to start to use Firebase quickly in a project (it includes making a PCB and Hardware as well in a short video)
IOT Home automation using Google Firebase
Using FireStore NoSQL data base
Firebase Firestore Tutorial #1 - Introduction