At least as a software engineer for such kind of integrations you can take fulfilment by knowing you are helping real people do their job in a less painful way.

I know a few colleagues who enjoy that kind of work, slapping a much better and intuitive UI on top of their own services integrating with SAP, Salesforce and so on.

You improve overall productivity and can show that data comparing how much faster someone using your interface is versus the likes of SAPgui, etc.