Karthick SG

• Developed backend microservices using Node.js, Express.js, and TypeScript, following clean architecture and RESTful API best practices.
• Implemented infrastructure-as-code using Azure Bicep to automate provisioning of Azure resources including Function Apps, Logic Apps, Event Grid, and Event Hub.
• Designed and maintained CI/CD pipelines using GitHub Actions to deploy individual microservices to their corresponding Azure Function Apps.
• Implemented event-driven workflows by subscribing Azure Event Grid events and processing them through Azure Functions.
• Integrated Azure Logic Apps with backend services to trigger automated email notifications.
• Worked closely with cloud and DevOps teams to ensure secure, scalable, and reliable Azure deployments.
• Integrated Self-Hosted Cal.com scheduling system to enable seamless doctor appointment bookings within the healthcare application, allowing patients to view real-time availability and schedule consultations directly.
• Worked with Aidbox as a FHIR backend to manage and validate HL7 FHIR R4 resources for clinical data storage and interoperability.
• Integrated Beda EMR with backend microservices to support electronic medical record workflows and FHIR-based data exchange.

• Currently working on a multi-tenant healthcare application supporting two organization tenants using a microservices architecture built with NestJS.
• Designed and developed backend services using Node.js, NestJS, and TypeScript with modular and scalable architecture.
• Implemented AWS infrastructure using CloudFormation templates for consistent and automated environment setup.
• Managed hospital documents and electronic health record files using Amazon S3 with secure access policies.
• Implemented clinician-to-patient video consultation feature using Azure Communication Services.
• Generated secure video room links and integrated webhook-based triggers to notify patient application backends.
• Developed scheduled cron jobs to generate daily hospital summary reports in PDF format using the pdfmake library.
• Uploaded generated reports to Amazon S3 and created pre-signed URLs for secure document access.
• Published pre-signed URLs to Kafka topics, which were consumed by notification services to send automated email reports with PDF attachments to hospitals.

• Played a key role in R&D and collaborated with the Singpass API team to implement secure digital authentication for Singapore government applications.
• Designed and developed scalable REST APIs using Node.js and Express with JWT and OAuth 2.0 authentication.
• Built responsive and high-performance UIs using React (Hooks, Redux) and Angular.
• Integrated multiple third-party services and resolved complex issues in React Native mobile applications.
• Developed private npm packages to deliver shared library support within the organization.
• Collaborated closely with QA, UAT, and business teams to ensure high-quality releases.

Technologies used:

• React
• Redux
• Angular
• Node.js
• Microservices
• OAuth 2.0
• Azure

• Developed enterprise-grade web applications using MERN and MEAN stacks.
• Enhanced frontend performance using React hooks, Redux, and optimized API calls.
• Worked on mobile application integrations and issue resolution in React Native.
• Actively participated in code reviews, unit testing, and deployment cycles.
• Built end-to-end web applications using MEAN stack.
• Designed efficient MongoDB schemas and optimized NoSQL queries.
• Developed customizable invoice systems for accounting platforms.
• Initiated iOS mobile app development using SwiftUI and MVVM architecture.
• Implemented role-based authentication using JWT bearer tokens.