You can use it for Vehicle Route Problems. I did so once as an interview project but never in production. If you start from some example problem, the learning curve isn't so steep.

https://en.wikipedia.org/wiki/Vehicle_routing_problem

We've done a lot lately to reduce the learning curve for OptaPlanner (open source).

Have you seen our quickstarts repo? https://github.com/kiegroup/optaplanner-quickstarts It features various use cases across various technologies.