• Design, develop, and maintain backend services using NestJS, Node.js, and TypeScript • Implement and manage database schemas and interactions with PostgreSQL and Elasticsearch • Create, deploy, and manage Docker containers for microservices • Integrate AWS Cognito for secure user authentication and authorization • Design and implement RESTful APIs • Build and maintain a GraphQL gateway • Write unit and integration tests • Collaborate with cross-functional teams • Ensure compliance with security best practices • Participate in code reviews and documentation