The tutorial expands on a previous Flutter app project by incorporating user engagement metrics and an experiment involving emoji icons to potentially increase interaction. Utilizing the Statsig Dart SDK, the tutorial guides users on integrating Statsig for logging user selections and setting up an experiment to display emojis as startup logos. The process involves making an asynchronous network call to fetch user data, followed by implementing an onTap event to track user interactions when selecting a startup name. The experiment divides users into test and control groups, with the test group experiencing the emoji feature, aiming to boost engagement metrics. The tutorial emphasizes the importance of experimentation in app development, referencing the CUPED method and insights from industry experts like Ronny Kohavi and Allon Korem, while also reflecting on the evolution of A/B testing and its impact on product strategy, drawing from experiences at companies like Facebook and Optimizely.