Modernization and Optimization of a Health App

Software Development

UI/UX Design

The ANS Clinic app is a mobile patient application for iOS and Android for recording and analyzing individual health data—technically revived and modernized after the original version was no longer functional.

Originally developed by a third party in 2017, the app was technically outdated and no longer available in app stores. As part of this project, the application was modernized through refactoring and updating the software frameworks (e.g., Angular 5) so that it could be re-released in app stores (Google Play, Apple App Store) and further developed in the long term.

Business Model

Patient-supporting app to assist individual therapies

Industry

Medical Technology | Healthcare

Platform

Web | iOS | Android

Target Audience

B2C | Patient Care

Tech Stack

Use Cases

Revival and technical modernization of an existing patient app
QR code login for unique patient identification
Offline usage and push notifications for daily data entry
Visualization of measurements in dashboards including statistics
Delivery of personalized, therapeutically relevant recommendations
GDPR-compliant data processing and improved system stability

Development

Cross-Platform

Roles

Developer
& Product Owner

Onexis Involved

3

The Problem

The following points illustrate the initial situation and the challenges that we gradually addressed and resolved throughout the project.

After the last update in 2023, the app was no longer functional and could no longer be used by patients.
The existing code was outdated, confusing, and lacked a clear structure or sufficient documentation.
The original development team was no longer available.
The actual project scope was initially underestimated – what seemed like a small update turned into a comprehensive refurbishment project.

Our Expertise

Whether outdated systems, missing documentation, or complex requirements: we bring order to fragmented code bases, develop stable app architectures, and integrate secure cloud solutions. Our technical expertise makes even challenging projects maintainable and future-proof in the long term.

Legacy Modernization &
Code Refactoring

We take over fragmented, outdated codebases without documentation and restore them to full functionality.

Through structured refactoring and technological updates, we create a stable foundation for long-term maintainability.

Reverse Engineering &
Functional Reconstruction

Even without clear requirements or understandable code logic, we can analyze, interpret, and restore existing applications — including data migration and ensuring all essential functionalities.

App Development with
Offline Capability

We develop cross-platform apps with a strong focus on performance, stability, and user experience. Offline functionality, push notifications, and GDPR-compliant data processing are included by default.

Patient-Centered Features &
Usability Optimization

QR code login, personalized recommendations, and visually prepared dashboards create real everyday value for patients. The app remains intuitive and easy to use—even for users with little technical experience.

Seamless Cloud Integration
& Data Security

We rely on Firebase Hosting and Firestore to enable secure, scalable, and resource-efficient data processing. GDPR compliance and high system availability are always top priorities.

Agile Development &
Close Collaboration

Even in projects where the client has little or no technical background, we ensure reliable outcomes through clear communication, strict prioritization, and transparent processes.

What Core Features Have Been Implemented?

User Login

Data Analysis

Dashboards

Notifications

App Launch & Visibility

Backup and Restore

GDPR Compliance

Custom Configurations

What makes the ANS Clinic App Special from a Technical Perspective

The app is an example of how outdated legacy applications can be transformed into a modern and patient-friendly solution. Our approach combines cross-platform development, offline functionality, and data protection-compliant processing—making the app reliable and usable again in patients’ everyday lives.

Frontend

Angular + TypeScript + Ionic: Enables component-based development for clear code structure, rapid feature implementation, and reusable UI elements
Capacitor: Utilizes native device functions like push notifications without sacrificing the benefits of a shared web codebase.
Responsive & Mobile First: Optimized for smartphones and tablets, intuitive to use even for patients with little technical experience

Backend, Cloud & Infrastructure

Node.js: Flexible backend for processing and preparing patient data
Firebase Functions (Serverless): Scalable, maintenance-free, and ready to use immediately without managing your own servers
Firestore & SQLite: Fast, flexible data storage both online and offline; ensures uninterrupted use even with unstable connections
Firebase Hosting: Automatic scaling, high availability, and minimal maintenance effort

Highlights

QR Code Login: Provides secure and unique patient identification without complicated registration
Push Notifications: Serve as daily reminders for data entry and therapy adherence
Personalized Recommendations: Based on the configured therapy requirements
GDPR-compliant Data Processing: Ensures secure cloud integration for maximum patient safety

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