App uses node js @camunda8/sdk library to call camunda api.
The enviroment values are loaded from .env file you can find more details about dotenv here
If you use default docker setup provided by the camuda then the .env file in the repo works fine.
If you are using camunda cloud env refer saas.env for the values.
Download latest version of zeebe from github https://github.com/camunda/camunda/releases
Checkout the README.md file how to install elastic search locally
Run .bat files under bin folder to start server locally