Dejan Teofilovic

Led architecture and development of Onikron's next-generation self-scheduling platform for health care clinics, built on Django and Vue/TypeScript. Implemented real-time patient appointment booking, confirmations via SMS/email, and scalable multi-clinic support. Designed modular microservices (appointment management, notification service, scheduling core) using Node.js and WCF for legacy SOAP integrations, following SOLID and TD D practices to keep services maintainable and extensible. Implemented encryption technologies (DRM, PKI) and secured OAuth 2.0/OpenID Connect to ensure HIPAA-compliant data handling. Integrated scheduling with multiple EHR systems via FHIR REST APIs and HL7 v2 messaging for real-time data synchronization. Refactored core services to async/await and implemented RabbitMQ-based async notifications, achieving faster responses and better throughput. Enhanced the UI with Vue.js/Vuex, delivered hybrid mobile experiences with Ionic, and leveraged Redis clustering for l

Led the architecture and development of Onikron’s next-generation self-scheduling platform for health care clinics, built on Node.js, React/TypeScript, and MySQL, enabling real-time patient appointment booking, confirmations (SMS/email), and scalable cross-network deployment.

Led architecture and development of Onikron's next-generation self-scheduling platform for health care clinics, built on Django, Vue/TypeScript with Vue.js and SQL, enabling real-time patient appointment booking, confirmations (SMS/email), and scalable operation across a multi-clinic network.