I'm a Senior Full Stack Developer with extensive experience in education, healthcare, fintech, and enterprise web applications. I specialize in Node.js, React/Next.js, Vue/Nuxt, and scalable backend architecture. I have hands-on expertise in SMART on FHIR integration, OAuth2 with PKCE security, and EHR interoperability with enterprise platforms. I thrive on delivering secure, production-grade systems for regulated industries.

Uroš Spasojević

I'm a Senior Full Stack Developer with extensive experience in education, healthcare, fintech, and enterprise web applications. I specialize in Node.js, React/Next.js, Vue/Nuxt, and scalable backend architecture. I have hands-on expertise in SMART on FHIR integration, OAuth2 with PKCE security, and EHR interoperability with enterprise platforms. I thrive on delivering secure, production-grade systems for regulated industries.

Available to hire

I’m a Senior Full Stack Developer with extensive experience in education, healthcare, fintech, and enterprise web applications. I specialize in Node.js, React/Next.js, Vue/Nuxt, and scalable backend architecture.

I have hands-on expertise in SMART on FHIR integration, OAuth2 with PKCE security, and EHR interoperability with enterprise platforms. I thrive on delivering secure, production-grade systems for regulated industries.

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Experience Level

Expert
Expert
Expert
Expert
Expert
Expert
Expert
Expert
Expert
Expert
Expert
Expert
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Language

English
Fluent
Serbian
Advanced

Work Experience

Senior Web Developer at eClinicalWorks
March 1, 2023 - Present
Designed and developed 7 full-stack medical wellness web applications for patient services, clinic administration, and secure data management. Built scalable backend using Node.js, Express.js, and Sequelize ORM with a MySQL database. Implemented secure authentication and authorization with JWT, express-session, and bcrypt, including RBAC for patients and administrators. Developed a patient portal with registration, profile management, appointments, vault, surveys, and feedback. Created an admin dashboard for managing patients, staff, doctors, services, appointments, insurance records, medical letters, and educational content. Integrated Stripe payments. Architected and implemented SMART on FHIR EHR Launch integration enabling interoperability with third-party apps and enterprise EHR systems. Designed secure OAuth2 with Authorization Code + PKCE, session management and CSRF protection. Integrated FHIR R4 APIs for real-time data retrieval and contextual launch handling. Delivered product
Senior JS/TS Engineer at Clevertech (DBA Lumenalta)
November 1, 2020 - January 31, 2023
Developed features to meet client requirements, increasing user satisfaction and retention. Improved project performance by codebase analysis and targeted optimizations. Demonstrated leadership by collaborating to solve complex problems and taking on additional responsibilities. Created and maintained workflows to implement new features and update existing ones with organized code. Reduced website loading time by 20%, lowering bounce rates and increasing engagement. Adapted quickly to client needs, delivering projects that met or exceeded expectations.
Full-stack Developer at Clevertech (DBA Lumenalta)
October 1, 2018 - August 31, 2020
Migrated backend from MySQL to MongoDB, enhancing scalability and performance. Designed and implemented robust user authentication. Developed seamless payment processing and integrated various payment gateways. Implemented real-time order tracking. Ensured responsive/mobile-friendly design. Delivered scalable architecture supporting future expansion and feature integrations. Worked with cross-functional teams to deliver critical features.

Education

Bachelor of Computer Programming, Graphic Design at University of Belgrade
January 11, 2030 - March 10, 2026

Qualifications

JavaScript Algorithms and Data Structures
April 1, 2021 - March 10, 2026

Industry Experience

Healthcare, Education, Software & Internet, Financial Services, Professional Services