Staff Mobile Engineer, Spend Foundation

About Airwallex Airwallex is the AI-native financial operating system for a real-time, intelligent economy. More than 676,000 businesses, including McLaren Racing, Qantas, SHEIN, and TikTok, use us, directly or through our platform partners, to run their financial operations or build and monetize financial products of their own. We started in Melbourne in 2015 to build the infrastructure global commerce runs on. We're the regulated backbone behind global payments: not by accident, but by design. A decade plus, 85+ licenses, and a financial infrastructure spanning North America, Europe, the Middle East, and Asia-Pacific. We're co-headquartered in San Francisco and Singapore, with more than 2,300 people across 27 offices. We hire builders with founder-level energy, people who move fast with good judgment, dig in with real curiosity, and make calls from first principles rather than waiting to be told what to do. Read our operating principles to see it in full. About the team The Mobile Foundations team sits at the core of Airwallex’s mobile stack. We build and evolve the shared architecture, libraries, and tooling that power our fully native iOS and Android apps. Our apps help businesses manage global B2B payments, submit and approve expenses, and control both virtual and physical Airwallex cards—complete with seamless Apple Pay and Google Pay integration. On iOS , we work with Swift, SwiftUI, Combine, and async/await . On Android , we use Kotlin, AndroidX, Coroutines, Hilt , and the Jetpack ecosystem. Mobile Foundations is a platform / horizontal team : we don’t just build features, we create the building blocks that enable product squads to ship faster, more reliably, and with a consistent, high-quality user experience. This role can be based in Singapore , Melbourne, or San Francisco . What you’ll do As a Staff Mobile Engineer on the Mobile Foundations team, you will lead the technical direction of our mobile platform across iOS and Android. You will design and evolve the core architecture, own critical shared components, and act as a multiplier for mobile engineers across product teams. You will: Define and evolve mobile architecture Lead the design and evolution of the shared architecture for our native mobile apps, including navigation, state management, networking, offline strategies, and error handling. Drive modularisation and clear boundaries between foundation modules and product features. Own core mobile platform capabilities Own and maintain shared libraries and frameworks (e.g. design system components, analytics, feature flags, experimentation, authentication, payments, observability). Be responsible for the application's authentication and authorization mechanisms. Ensure these components are stable, well-documented, and easy to adopt and extend by product teams. Improve security, reliability, performance, and observability Drive mobile application security, including anti-tampering measures, certificate pinning, and security best practices. Define and track platform-level metrics such as crash-free sessions, ANRs, app start-up time, bundle size, and network performance. Partner with product teams to drive initiatives that improve reliability, performance, and overall mobile quality. Strengthen end-to-end observability across mobile (logging, metrics, tracing, crash reporting) and use data to guide priorities. Elevate developer experience, CI/CD Own and continuously improve our mobile CI/CD pipelines (e.g. GitHub Actions, Bitrise), reducing build times, flakiness, and friction in releasing features. Improve developer experience for mobile engineers through tooling, templates, documentation, and automation. Manage Mobile Release, Operational Health, and Best Practices Own the end-to-end mobile release process across iOS and Android, ensuring timely and reliable delivery of new versions. Establish clear guidelines and lead the on-call rotation for critical platform-level incidents, ensuring rapid response and resolu