Bot Poker runs on Heroku. They have made an awesome platform, with clear and simple API, and have a great documentation.
I am grateful that their plans start from free price... this has given me the possibility to start learning.
Bot Poker uses mongodb as database for the game data.
Despite the large number of mongodb as a service provider out there, at the end I choose to configure my own mongodb instance on a virtual machine provided by Digital Ocean.
They gives me the possibility to use their cloud VMs essetially for everything I want to.
You should definitely give them a try!
Bot poker wouldn't be possible without the awesome open source works of many talented people out there.
If you feel you contributed somehow to Bot Poker, please let me know, and I will add your contribution to the following list.