Deployment should involve upgrading the .rpm or .deb on your production servers, or failing over to new instances which already have them. To try and decide whi

Deployment should involve upgrading the .rpm or .deb on your production servers, or failing over to new instances which already have them. To try and decide which deployed files need to be replaced is very likely to leave you not actually knowing exactly which code you are running. Deployment process is never a good reason for choosing a language. Deployment can (must!) be automated and reproducible. Language choice is about hiring, development speed, rate of mistakes, and hardware cost for sufficient capacity.