Hi,
I have 5 year experience in Ruby on rails, I have worked in and deployed many rails application to AWS and digital ocean with instance using Ubuntu OS.I Use Capistrano for deployment, also configured nginx with unicorn
What you described is exactly what I am currently working on =P
I am developing a backend for a mobile application deployed on Docker on AWS EC2. Should be enough for your needs I think. Hope we get to work together!
Thanks!