David A.Private profile: Upwork shows its earnings only to signed-in members, so we check it every few weeks, not daily. MRR here is a rough estimate (Upwork's six-month earnings ÷ months active). Last read Sep 25, 2026.

As a dedicated Full-Stack Developer with a Bachelor of Science in Computer Science from the Stanford University, I bring a robust background in developing dynamic and efficient web applications. With over 20 years of experience in Healthcare IT and Full-Stack Software Development, I help healthcare organizations, medical software vendors, hospitals, laboratories, and healthcare startups build secure, scalable, and compliant solutions. My expertise spans healthcare interoperability, system integration, data exchange, and modern web application development. I have extensive experience working with healthcare standards and technologies including HL7, FHIR, Mirth Connect (NextGen Connect), ETL pipelines, EHR/EMR integrations, healthcare data transformation, interface development, and clinical workflow automation. In addition to my healthcare specialization, I am a highly skilled Full-Stack Developer capable of delivering complete end-to-end solutions from architecture and backend development to modern frontend applications. Healthcare Expertise: • HL7 v2.x Message Processing • FHIR APIs & Integrations • Mirth Connect (NextGen Connect) • EHR/EMR System Integration • Laboratory Information Systems (LIS) • Healthcare Data Migration • ETL Development & Data Transformation • Healthcare Workflow Automation • HIPAA-Aware Solution Development • Healthcare Reporting & Analytics Technical Proficiencies: • Programming Languages: Python, JavaScript, TypeScript, PHP • Backend Frameworks: Django, Laravel, Node.js • Frontend Frameworks: React, Next.js, Angular, Vue.js • Databases: PostgreSQL, MySQL, SQL Server, MongoDB • Integration Technologies: REST APIs, SOAP, HL7, FHIR • DevOps & Infrastructure: Docker, CI/CD, Git, Linux, Nginx, Apache • Architecture: MVC, Microservices, Distributed Systems Why Clients Hire Me: ✓ 20+ Years of Healthcare Industry Experience ✓ Deep Understanding of Clinical and Administrative Workflows ✓ Proven Expertise in Healthcare Interoperability ✓ Full-Stack Development from Concept to Deployment ✓ Strong Communication and Project Leadership Skills ✓ Focus on Scalable, Secure, and Maintainable Solutions Whether you need healthcare integrations, HL7/FHIR interfaces, Mirth Connect development, ETL solutions, EHR connectivity, or a complete healthcare web platform, I can help deliver reliable solutions that meet your business and technical goals. Let's build healthcare technology that improves efficiency, interoperability, and patient outcomes.