The plugin made in Java consisted in making a bank of special objects for each player as well as a user interface with the Inventory template of the game to facilitate access and navigation to this feature.
The Twitch bot is a bot made in Node.js consisted in adding features on a Twitch string.
This bot also needed to know when a player is connected on the Twitch chain and at the same time on one of the Minecraft servers.
And to make this link, we had to go through a website to link a Twitch account to a nickname of a connected Minecraft account with an easy to use interface.
Which was quite rewarding because I hadn't done Node.js for a professional before.