To create product notifications that delight users, developers should consider their users' experiences and design notifications as an extension of the product. Notifying intelligently means serving users the right content, in the right channel, at the right time. Offering notification granularity allows users to control how they receive notifications, while batching notifications can help avoid overwhelming users. Being helpful means providing all the information users need to achieve their end goal, and using analytics to optimize user experience. By considering these principles, developers can create notifications that enhance and don't spoil users' experiences, ultimately defining a better user experience for their product.