Staff Mobile Engineer, Spend Foundation

Airwallex•San Francisco, CA

4d•$180,000 - $300,000•Hybrid

About The Position

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.

Requirements

8–10+ years of experience building native mobile applications on iOS or Android, including at least 3+ years operating at a Senior or Staff level.
Deep expertise in iOS: Swift, SwiftUI, Combine, async/await, or Android: Kotlin, AndroidX, Jetpack, Coroutines, Hilt with commercial knowledge of both platforms.
Proven track record leading cross-team technical initiatives and evolving mobile architectures (e.g. modularisation, design systems, networking, offline support, or similar).
Strong focus on code quality and reliability:
Designs for testability and maintainability.
Writes high-quality automated tests and uses coverage meaningfully (not just as a number).
Experience owning and improving mobile CI/CD pipelines (e.g. GitHub Actions, Bitrise), including build optimisation, test stability, and release workflows.
Demonstrated ability to influence without authority:
Aligns engineers, PMs, and designers around technical direction and makes pragmatic trade-offs.
Bachelor’s degree in Computer Science, Engineering, or a related field, or equivalent practical experience.

Nice To Haves

Experience defining and driving a mobile platform roadmap, balancing foundational work with product delivery needs.
Prior ownership of shared mobile libraries or frameworks used by multiple product teams at scale.
Hands-on experience with: Design systems and component libraries on mobile.
Analytics, experimentation, and feature flagging on mobile.
Observability tooling (e.g. Crashlytics, Sentry, logging/metrics platforms).
Experience in domains such as payments, fintech, or B2B SaaS, especially where reliability, security, and regulatory requirements are critical.
Experience mentoring other senior engineers and playing a key role in hiring and growing mobile teams.
Contributions to the mobile community (open source, talks, blog posts) or evidence of thought leadership in mobile architecture and foundations.

Responsibilities

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 resolution.
Define, document, and enforce mobile engineering best practices across the organization to maintain a high bar for code quality and platform consistency.
Lead cross-team technical initiatives
Drive cross-squad projects (e.g. rollout of a new design system, major architectural changes, cross-platform feature foundations) from problem definition through to rollout and adoption.
Align stakeholders (EMs, PMs, designers, backend/platform teams) around technical direction and trade-offs.
Be a hands-on technical leader and mentor
Lead by example with clean, testable, well-structured code on either iOS or Android, while setting standards across both platforms.
Provide technical mentorship and guidance to senior and mid-level engineers through design reviews, pairing, and coaching.
Contribute to and influence hiring, onboarding, and the growth of the mobile engineering community at Airwallex.