NPJobs is a fun Bukkit/Spigot plugin designed to allow operators to hire NPC workers to do various supported jobs such as construction, farming, and guarding. Hence, the project name is a combination of both NPC and Jobs. At the moment the plugin only supports construction. Farming and guarding are still work in progress.
For more information, click here.
This plugin currently only supports 1.21.1, more versions will be supported in the future.