When modernizing a massive application, a full rewrite is rarely an option, but a completely isolated Flutter module isn't enough either. For one of Europe's largest financial institutions serving 100k+ enterprise users, the solution was a deeply integrated hybrid architecture: a single application where native screens and Flutter screens coexist side-by-side in the same navigation flow.
Drawing on my 5 years as a Flutter GDE, this advanced session breaks down the technical realities of orchestrating a hybrid navigation stack. We will explore how to manage seamless transitions between native Activities/ViewControllers and Flutter routes without jarring user experiences. We will dissect the plumbing required for deep state sharing across screen boundaries, handling complex lifecycle synchronization, and optimizing memory when native and Flutter engines tightly interleave at scale.