The mobile banking app that millions of customers touch every day is being rebuilt around a modern, modular Android architecture – not screens bolted onto a monolith, not a decade of accreted tech debt, but a scalable, testable, high-performance app engineered to move fast without breaking under load. This team is doing that work: designing and shipping the architecture that powers next-generation mobile experiences across the bank’s consumer surface area. The stack is deliberate. Kotlin owns the app layer. Jetpack Compose drives the UI. Coroutines and Flow handle async and reactive state. A modularized Gradle build keeps feature teams moving independently. Kotlin Multiplatform is under evaluation for shared business logic. The work isn’t picking libraries – it’s making them perform at scale in a regulated production environment. You will write code, design systems, debug production issues, and push into an app that real customers depend on to move real money. The patterns for a modular, Compose-first banking app at this scale are still being written; you will be the one who writes them down. You will work directly with product owners, mobile architects, and adjacent feature teams to take experiences from design mock to production on a one-year engagement that touches real customer volume from day one. This isn’t a role where you prototype and hand off. The expectation is that you own the vertical – design decision to shipped artifact – and leave the codebase better than you found it.