Hiring a Google Maps/OpenLayers developer can significantly enhance your application by integrating geospatial data and interactive mapping features. They can create custom maps, implement real-time tracking, and location-based services to improve user experience and engagement. Their expertise can facilitate better decision-making through geographic data visualization, useful in industries like real estate, transportation, and logistics. Their skills can also be pivotal in developing location-based marketing strategies, enhancing your business reach and customer interaction. Overall, they can provide a more dynamic, interactive, and user-friendly interface for your application.