Appian query

Hi [mention:bb176b67c26c4e89b2173f39160c9f46:e9ed411860ed4f2ba0265705b8793d05] ,

When Appian wants to act as middleware, Appian needs to integrate with external system and Appian can perform business logics through APi's, and the frontend which is built with another technology can interact with these Api's and can retrieve the data or to perform any operations

You need to expose your processes as web APIs and the frontend will invoke them when needed. It's a headless approach.