A Google Places API developer incorporates Google Places API into applications to leverage features like location-based suggestions, real-time updates, and detailed place information. They create interactive experiences by displaying maps, enabling location search, and offering place recommendations. By accessing data about millions of locations, they enhance user experience with relevant local insights. They work on geocoding addresses, calculating distances, and developing location-based features, ensuring they meet the performance, reliability, and security standards. They also manage API requests, handle errors, and ensure the application remains within the API usage limits. They play a crucial role in creating location-aware applications.