I had a good experience with AWS Elastic Beanstalk. Basically Heroku on AWS. I used it with Docker, but they support having a definition file like Heroku's Proc

I had a good experience with AWS Elastic Beanstalk. Basically Heroku on AWS. I used it with Docker, but they support having a definition file like Heroku's Procfile as well. It abstracts most of the underlying infra like EC2 and VPCs if you don't want to get into that. It also gives you access to everything else AWS has like RDS. Upgrade paths are simple as well since you're on AWS.