I have been using Convox for the last 3 years and it has been super reliable. Convox is essentially bring your own infra Heroku built on top of AWS ECS (Docker)

I have been using Convox for the last 3 years and it has been super reliable. Convox is essentially bring your own infra Heroku built on top of AWS ECS (Docker). I believe one of the founders is from Heroku.