- Ruby - if your Ruby/Rails app falls behind, you will be paying back debt to get it up to date
- PHP - if your Laravel/CI/Cake/Slim/Symphony App falls behind, you will be paying back debt to get it up to date
- Go - if your Go app falls behind, you will be paying back dept to get it up to date
- Python - if your Django app falls behind, you will be paying back debt to get it up to date
- Elixir - if your Phoenix app falls behind, you will be paying back debt to get it up to date