John Cedrick A. Del Rosario

Engineered and optimized an Oracle Cloud computing system for healthcare analytics, increasing data retrieval speed by 45% and enhancing patient care efficiency by 30%. Led Agile SCRUM practices, developed a company-wide UI design system with React and Redux, and built responsive visualizations with D3.js and Socket.IO. Implemented real-time data aggregation with GraphQL for flexible querying, and created RESTful APIs plus a backend AI service with Node.js and NestJS. Managed high-volume data access via Oracle DB with optimized queries and caching. Implemented HTTPS/TLS and OAuth 2.0 for security; used field-level encryption in transit and at rest. Integrated AI/ML models for predictive analytics using OCI Functions or OCI Data Science. Reduced duplicate code by 80% through DRY principles and design patterns. Built bridging modules with AWS Lambda, SNS, and SQS. Implemented TDD and CI/CD in Jenkins.

Led v2 development of the application using React, Redux Toolkit, Material UI, and D3, significantly enhancing user experience. Migrated the existing Angular UI to React, boosting performance and maintainability. Created front-end tests and ensured API quality. Built RESTful APIs and GraphQL queries using Node.js, NestJS, Python, and Django. Implemented unit and end-to-end testing. Developed AWS Step Functions and serverless APIs using S3, SDK, API Gateway, DynamoDB, Lambda, and other AWS services to improve scalability and reliability.

Developed web and mobile applications including a time-tracking management tool, team communication tool, health-network app, and social networking applications using React, Vue, Node.js, Python, and Django. Collaborated in an agile environment to deliver high-quality software solutions. Engineered real-time tracking, live chat features, and a secure payments system for user-facing sites and admin dashboards. Designed scheduling, mission management, and notification dashboards. Integrated third-party APIs (AWS, Twilio, Stripe, Braintree) and leveraged AWS Lambda and Serverless. Implemented Azure Active Directory B2C for SSO and integrated Firebase features. Enabled real-time updates via Socket.IO. Used Apollo GraphQL for data management.