The increasing demand for efficient healthcare ser- vices has emphasized the need for secure and centralized man- agement of medical data. Traditional healthcare systems often rely on paper-based or fragmented digital records, resulting in inefficiencies, delayed diagnosis, and poor coordination among healthcare providers. This paper presents HealthStack, a dig- ital healthcare ecosystem designed to provide secure, mobile- accessible, and centralized health data management. The system enables patients to store and access medical records, book doctor appointments, and share health information securely. Health- Stack is implemented using an Android application developed in Java, a Node.js backend, and Supabase as the cloud platform for database management, authentication, and storage. Advanced security mechanisms including role-based access control, row- level security, SSL/TLS encryption, and two-factor authentication ensure data privacy and integrity. The proposed system enhances healthcare accessibility, improves doctor–patient coordination, and supports sustainable, paperless healthcare practices.

HealthStack demonstrates the effective integration of mobile applications, cloud infrastructure, and secure authentication mechanisms to address key challenges in healthcare data management. By providing centralized access to electronic health records and appointment booking, the system improves healthcare accessibility and coordination. The implementation of two-factor authentication and role-based access control ensures strong data security and user trust. Future work may include telemedicine integration, AI-based health analytics, and wearable device support, making HealthStack a scalable and extensible digital healthcare ecosystem.

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