The Senior Flutter/Mobile App Engineer is responsible for the architecture and delivery of Xenter's patient- and provider-facing mobile applications. This position owns cross-platform application development for the Xenter ecosystems, including integration with connected devices, and sets technical direction for mobile development as the team grows.
Essential Duties and Responsibilities- Design and build cross-platform mobile applications in Flutter/Dart for iOS and Android supporting patient- and provider-facing workflows
- Own mobile application architecture, state management, and code quality standards
- Design and implement Cubit/BLoC-driven screens with matching state and repository layers
- Extend our Dio-based networking stack: interceptors, retries, timeouts, error normalization, certificate pinning
- Integrate with FHIR R4 clinical data via native platform channels
- Build against our LLM chat backend with role-scoped prompts and PHI-safe streaming
- Own testing at every layer: widget, cubit, repository, and security regression suites
- Integrate mobile applications with Bluetooth Low Energy (BLE) connected devices in coordination with the device connectivity team
- Build reliable offline-first experiences appropriate for clinical and field-use environments
- Lead App Store and Google Play release processes, including versioning and compliance requirements
- Provide technical mentorship to other mobile engineers and help establish mobile engineering standards
- Coordinate with design, product, and clinical stakeholders to translate clinical and patient workflows into application requirements
Required Education and Experience- 5+ years of mobile development experience, including 3+ years in Flutter/Dart
- Strong understanding of mobile application architecture patterns (BLoC, Provider, Riverpod, or similar)
- Deep familiarity with the widget lifecycle, build performance, and platform channels
- Strong REST fundamentals: verbs, status codes, idempotency, pagination, error contracts
- Hands-on with dio (interceptors, transformers, cancel tokens) or equivalent (http, chopper, retrofit)
- OAuth 2.0 (authorization code + PKCE), JWT parsing and refresh flows, session lifecycle
- Certificate/SPKI pinning and understanding of TLS trust chains
- Experience with layered caching: in-memory, disk, and HTTP-level
- Comfortable choosing between flutter_secure_storage, shared_preferences, hive, isar, sqflite, or drift based on data sensitivity and query needs
- Cache invalidation strategies (TTL, ETag, event-driven)
- Understanding of iOS provisioning, entitlements (HealthKit, Keychain sharing), and App Store submission
- Experience shipping production applications to both the App Store and Google Play
- Experience with native iOS/Android concepts and platform channels
- Demonstrated ability to own technical decisions independently within a small team
Preferred Education and Experience - Experience integrating mobile applications with Bluetooth Low Energy (BLE) medical or IoT devices
- Experience building software in a regulated industry (healthcare, medical device)
- Familiarity with CI/CD for mobile (Fastlane, Codemagic, or similar)
- Experience with accessibility standards for clinical or patient-facing applications
- Healthcare, HIPAA, or other regulated-data experience (finance, government)
- HealthKit, Google Fit, or FHIR R4 exposure
- OAuth with SMART-on-FHIR or Epic/Cerner integrations
- LLM/chat product experience: streaming responses, prompt guardrails, PHI redaction
Physical Demands and Work EnvironmentThis position operates in a professional office environment and routinely uses standard office equipment such as computers and monitors. This is largely a sedentary role involving extended periods of computer use; some tasks may require the ability to move within an office setting.
Other DutiesThis job description is not designed to cover or contain a comprehensive listing of activities, duties, or responsibilities required of the employee for this job. Duties, responsibilities, and activities may change at any time, with or without notice.
