Having dedicated over 8 years to building robust mobile applications, I am confident in my ability to fulfill your project requirements. My experience with Native Android and iOS, as well as React Native, provide a solid foundation for tackling the complexities of your request.
Among my extensive portfolio of 100+ successful projects, I've developed various mobile applications from scratch which required user authentication, in-app messaging, and realtime notificationsjust like you seek for this app. My strong understanding of various triggers including user actions and time-based events enables me to design effective features with precision and efficacy.
Moreover, my proficiency in MongoDB is another asset I bring to the table. I have successfully integrated MongoDB with React Native in the past and am well-versed in its efficient use. As a freelancer who values quality, dedication, and timely delivery above all else, I believe we can work together seamlessly on this project to create a functional and user-friendly mobile app that exceeds your expectations.