Senior Mobile Engineer

Location: Sydney

Department: Engineering

At Sonder, we believe that every person deserves to feel safe, supported, and empowered to be at their best - wherever they are. That’s why we’re redefining workplace health, safety, and wellbeing through a seamless blend of technology and human expertise. Sonder’s mobile platform provides 24/7, real-time support from a dedicated team of safety, medical, and mental health professionals - ensuring that our members receive immediate care when they need it most. In critical situations, we go beyond digital support, offering on-the-ground assistance to manage time-sensitive incidents.

By harnessing real-time insights, we enable organisations to take proactive steps toward a healthier, safer future, which leads directly to tangible bottom-line business outcomes.

An Exciting Time to Join Sonder! 

Since our founding in 2017, Sonder has experienced rapid growth, expanding operations across Australia, New Zealand, and the UK. Backed by Australia’s leading venture capital firms, Seek and Blackbird, we are well-capitalised and on a mission to scale globally, partnering with corporations, educational institutions, and government agencies to transform workplace wellbeing at scale. Our impact and scale: 1,000,000+ members across multiple countries 200+ team members, plus an extensive network of on-the-ground responders If you’re passionate about using technology and human expertise to drive meaningful change, join us in shaping the future of workplace wellbeing!

The Role: Crafting an Impactful User Experience

We are looking for a high-impact Senior Mobile Engineer to lead the evolution of our mobile ecosystem. You aren't just an "Android developer"; you are a mobile architect who understands that the best user experiences often require a seamless blend of native performance, cross-platform efficiency, and robust cloud scaling.

This role is for you if you're a problem-solver who thrives in ambiguity, takes full ownership of your projects, and is eager to learn and adapt. You'll need to be adaptable and flexible, comfortable with shifting priorities and rapid iteration as we continue our fast-paced growth.

What You'll Be Doing

• Architect & Build: Lead the development of high-performance applications across both Android and iOS platforms.
• Bridge the Gap: Evaluate and implement cross-platform solutions (like KMP or React Native) to maximize code reuse without sacrificing quality.
• Cloud Integration: Design and maintain the mobile-to-cloud bridge, leveraging AWS to ensure data persistence, authentication, and real-time syncing.
• Technical Leadership: Mentor junior engineers, drive code reviews, and set the standard for mobile CI/CD pipelines and automated testing.
• Modernise: Keep us at the cutting edge - whether that’s migrating to Compose/SwiftUI or exploring the latest in Kotlin Multiplatform / React Native.

What You'll Bring to the Team

• Platform Versatility: 5+ years of professional mobile experience. You should be deeply proficient in Kotlin/Java, and/or in Swift/Objective-C.
• The Cross-Platform Edge: Proven experience with Kotlin Multiplatform (KMP) or React Native. You know when to go native and when to go cross-platform.
• Cloud Proficiency: Hands-on experience with AWS (AppSync, Amplify, Lambda, or S3) or equivalent platforms like GCP/Azure. You understand how to architect "offline-first" mobile apps.
• Deep Technical Knowledge: Strong grasp of modern architectural patterns (MVVM, MVI, or Clean Architecture) and Dependency Injection frameworks. Expert in reactive programming (such as Combine, Coroutines/Flow, or RxSwift) and building automated CI/CD pipelines using tools like Bitrise, GitHub Actions, or Fastlane.
• Product Mindset: You don’t just build tickets; you care about the UX and the "why" behind the features.

Bonus Points

• Active contributor to the open-source community.
• Knowledge of GraphQL and real-time data streaming.

Why Join Sonder?

• Hybrid and flexible working – strike the right balance for your life and productivity
• Free Sonder app access for you and your family – 24/7 health, safety and wellbeing support
• 2 days study leave
• Paid parental leave – 12 weeks for primary carers and 4 weeks for secondary carers, with a supportive return-to-work program
• Employee Share Option Plan (ESOP) – share in Sonder’s success
• Wellbeing fund – $250 per year to spend your way
• Novated leasing and salary packaging options
• Weekly team perks – free coffee Tuesdays, catered lunch Thursdays, and a dog-friendly office
• Volunteer leave – 2 days per year to support causes that matter to you
• Regular social and team events

Sonder is for Everyone

We’re committed to building a diverse and inclusive workplace. We encourage applications from people of all backgrounds, experiences, abilities and identities. If you need any support with your application or the recruitment process, please reach out – we’d love to hear from you.

Due to the nature of our industry, all Sonder employees are required to complete a National Police Check and Working With Children Check.

#LI-Hybrid