Hey @JasonMontague this does sound amazing.
We vet all custom code that run on the server first, so a github with the changes will be required, we have a ton of custom work that needs doing if you are game.
Best place to start is discord, http://discord.piratemc.com/ you can find me (GodsDead) the server owner in there, I can give you a small task for fixing a plugin(s) or creating something new if you wish to get started, we have roles setup for developers in-game, discord and we have a staff page https://piratemc.com/information/team/ with a developer section.
I look forward to hearing from you.