- Developed and optimized a PostgreSQL database for user management, invoice management, expense tracking, and inventory tracking, ensuring seamless front-end integration while prioritizing speed, reliability, and scalability.- Developed RESTful APIs and GraphQL endpoints, enabling efficient frontend integration and enhanced user experience.- Configured Kafka to ensure reliable email notifications and integrated Redis to enable scalable, real-time activity notifications.- Integrated external banking APIs to automate financial tracking and reporting.- Developed an automated and seamless card payment system to manage subscription renewals.- Managed the CI/CD pipeline and oversaw the deployment and hosting of frontend and backend applications on a production server, ensuring smooth and reliable operations.