Healthcare Mobile App

Healthcare app development carries unique constraints that make it significantly more complex than standard mobile development. Every design decision must consider patient privacy (HIPAA in the US), data security, accessibility compliance (WCAG 2.1 AA), and clinical workflow integration. The clinics used an existing Electronic Medical Records (EMR) system that needed to be integrated - not replaced - requiring a custom API layer between the app and the legacy system.

Additional challenges included supporting patients across a wide age range (many elderly users with limited tech confidence), handling unreliable internet connections in rural areas where some patients lived, and maintaining 99.9% uptime for a service patients depend on for urgent care access.

DataVonix chose React Native for the mobile frontend, enabling a single shared codebase for iOS and Android while delivering native performance. The backend was built on ASP.NET Core 8 with a clean REST API, deployed on Azure with all data stored in the UK region to meet data residency requirements.

A dedicated integration layer was built to communicate with the clinic's existing EMR system via its proprietary API, normalising data between the two systems and handling retry logic for API failures.

The application was designed to HIPAA standards throughout. Patient data is encrypted at rest using AES-256 and in transit using TLS 1.3. Multi-factor authentication is required for all patient accounts. All data access is logged in a tamper-proof audit trail. The Azure infrastructure uses private endpoints, network security groups, and Azure Key Vault for secrets management. A full penetration test was conducted before launch.

For patients in low-connectivity areas, the app uses a local SQLite cache to store upcoming appointments and recent records. When connectivity is restored, data syncs automatically. This was a critical requirement given the rural patient population.