Senior Android Engineer

About the role

X-Team is seeking talented Senior Android Engineers to join a mobile engineering squad at one of Australia's largest banks, working on two priority projects: making the mobile banking app resilient that is used by millions of customers, and building Open Banking features. You'll build it in Kotlin and Jetpack Compose with a SQLite persistence layer, using networking and database code generated from gRPC definitions.

Key responsibilities

• Build offline-first architecture ensuring the Android app remains resilient when backend services go down
• Develop Open Banking features that let customers link accounts from other banks
• Implement SQLite persistence layer with local caching and schema migrations
• Work with gRPC definitions and Protocol Buffers for automated code generation
• Ensure thread-safe data synchronization across the application
• Implement Kotlin Coroutines and Flow to keep UI rendering separate from background network work
• Apply Clean Architecture, MVVM or MVI patterns with dependency injection
• Implement Android security fundamentals including Android Keystore, certificate pinning, and OAuth2

About you

• 5+ years of senior native Android engineering, with expert Kotlin and Jetpack Compose
• Strong backend engineering expertise
• Production experience building offline-first apps with SQLite, including local caching, schema migrations, and thread-safe data synchronization
• Hands-on experience with gRPC, Protocol Buffers, and automated code generation on Android
• Experience with Clean Architecture, MVVM or MVI, and dependency injection with Hilt or Dagger
• Android security fundamentals: Android Keystore or EncryptedSharedPreferences, certificate pinning, and OAuth2
• Able to work onsite in Melbourne CBD for the first 2 to 4 weeks

Nice to have

• Experience building or using code-generation tools that map API definitions to SQLite schemas and DAO interfaces
• LaunchDarkly or similar feature flagging experience for staged rollouts and instant kill-switches
• Working knowledge of iOS patterns (Swift and SwiftUI) to keep behavior consistent with the iOS squad