Android jobs in Brazil

About the Role I am supporting a US healthcare client in hiring a Full-Stack Mobile Developer to take end-to-end ownership of their flagship mobile application. In this role, you will serve as the sole mobile developer, responsible for evolving an app that pairs with a Bluetooth-enabled pulse oximeter ring to capture overnight sleep data and securely upload it to the cloud.

You won't be working in isolation—while you'll lead all mobile-focused design and development, you'll collaborate closely with a team of experienced C# / .NET backend engineers. You'll also contribute to backend features related to sleep-study processing and data workflows, helping shape the overall product experience from device integration through clinical-grade data analysis.

This is an opportunity to own a critical mobile product in a modern health-tech environment, working with senior engineers to deliver technology that directly impacts patient outcomes. The ideal candidate will have expertise in both mobile development (Flutter / Dart) and backend technologies (C# / .NET), and be capable of ensuring seamless device integration, reliable overnight data collection, and robust backend connectivity with Azure services.

• Lead the development and maintenance of cross-platform mobile applications using Flutter / Dart for iOS and Android.
• Implement and optimize Bluetooth connectivity with the ring pulse oximeter device.
• Address Android battery optimization challenges to guarantee reliable overnight data collection.
• Manage the release process for both the Apple App Store and Google Play Store.
• Collaborate with backend developers on Azure-hosted .NET services, contributing to backend development when required.
• Ensure compliance with health data security and privacy standards.
• Work independently while providing technical leadership within the team.

• Professional level English comprehension (spoken, reading / writing)
• 7+ years of professional software development experience, with strong expertise in mobile development.
• Proven experience with Flutter / Dart for cross-platform mobile applications.
• Working knowledge of C# and .NET, with the ability to contribute to backend services.
• Deep understanding of Bluetooth Low Energy (BLE) implementation.
• Experience with Android battery optimization techniques for background processes.
• Successful track record of publishing and maintaining apps in the App Store and Google Play.
• Experience integrating with Microsoft Azure services.
• Familiarity with Firebase (Authentication, Crashlytics, Analytics), Sentry, and PostHog.
• Advanced English communication skills (C1 level), both written and spoken.
• Strong problem-solving abilities and attention to detail.
• Prior experience in health or medical app development is a plus.

• Primary: Flutter / Dart, Bluetooth LE, iOS, Android
• Secondary: C#, .NET, Azure, Firebase
• Tools: GitHub, Sentry, PostHog, App Store Connect, Google Play Console

• The opportunity to develop innovative health technology with real impact.
• Competitive salary based on experience.
• Professional growth and development opportunities.
• A collaborative team culture that values independence and initiative.