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  1. Freelancers

Uros S.

Offer Uros work on your next project.

Serbia Belgrade, Serbia
2 months 8 days back
Available for hire available for hire
on the service 2 months 27 days
Freelancer Uros S. — Serbia, Belgrade. Core skill — Web Design, Web Programming

Rating

Successful projects
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Average rating
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Rating
108
Web Design
3291 place out of 3915
Web Programming 1
5041 place out of 6431

CV

Senior Full Stack Developer with extensive experience in education, healthcare, fintech, and enterprise web applications. Specialized in Node.js, React/Next.js, Vue/Nuxt, and scalable backend architecture. Especially experienced in SMART on FHIR integration, OAuth2 + PKCE security implementation, and EHR interoperability with enterprise platforms. Proven ability to architect and deliver secure, production-grade systems across regulated industries.

Skills and abilities

Programming

Design & art

Services


Mobile development

Administration

Outsourcing & consulting


Translation

Portfolio


  • Senior Web Developer

    Website Development
    Senior Web Developer — example of freelancer's portfolio work in category Website Development
    Hotel Booking System

  • Web Developer

    Web Programming
    Web Developer — example of freelancer's portfolio work in category Web Programming
    Video Management System

  • Senior Web Developer

    Web Programming
    Senior Web Developer — example of freelancer's portfolio work in category Web Programming
    - Designed and developed 7 full-stack medical wellness web applications supporting patient services, clinic administration, and secure data management.
    - Built a scalable backend using Node.js, Express.js, and Sequelize ORM with a MySQL database.
    - Implemented secure authentication and authorization using JWT, express-session, and bcrypt, including role-based access for patients and administrators.
    - Developed a patient portal featuring registration, profile management, appointment access, document vault, surveys, and feedback systems.
    … - Created a comprehensive admin dashboard for managing patients, staff, doctors, services, appointments, insurance records, medical letters, and educational content.
    - Integrated Stripe payment processing for secure online payments tied to medical services.
    - Architected and implemented SMART on FHIR EHR Launch integration enabling seamless interoperability between third-party medical applications and enterprise EHR systems.
    - Designed secure OAuth2 authentication workflows (Authorization Code + PKCE) with session management and CSRF protection.
    - Integrated FHIR R4 APIs for real-time patient data retrieval and contextual launch handling.
    - Delivered production-ready healthcare applications aligned with US healthcare interoperability standards.