Staff Mobile Engineer, Spend Foundation

ABOUT AIRWALLEX Airwallex is the only unified payments and financial platform for global businesses. Powered by our unique combination of proprietary infrastructure and software, we empower over 200,000 businesses worldwide – including Brex, Rippling, Navan, Qantas, SHEIN and many more – with fully integrated solutions to manage everything from business accounts, payments, spend management and treasury, to embedded finance at a global scale. Proudly founded in Melbourne, we have a team of over 2,200 of the brightest and most innovative people in tech across 26 offices around the globe. Valued at US$8 billion and backed by world-leading investors including T. Rowe Price, Visa, Mastercard, Robinhood Ventures, Sequoia, Salesforce Ventures, DST Global, and Lone Pine Capital, Airwallex is leading the charge in building the global payments and financial platform of the future. If you’re ready to do the most ambitious work of your career, join us. ATTRIBUTES WE VALUE We hire successful builders with founder-like energy who want real impact, accelerated learning, and true ownership. You bring strong role-related expertise and sharp thinking, and you’re motivated by our mission and operating principles https://www.airwallex.com/us/operating-principles. You move fast with good judgment, dig deep with curiosity, and make decisions from first principles, balancing speed and rigor. You're humble and collaborative; turn zero‑to‑one ideas into real products, and you “get stuff done” end-to-end. You use AI to work smarter and solve problems faster. Here, you’ll tackle complex, high‑visibility problems with exceptional teammates and grow your career as we build the future of global banking. If that sounds like you, let’s build what’s next. 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 or Melbourne. 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, perfo