At Precious Infosystem, I design, develop, and maintain backend services with Node.js, NestJS, and Express.js. I build RESTful APIs for authentication, product catalogs, shopping carts, orders, and payment workflows.
I improve application performance through Redis caching and database query optimization across MongoDB, PostgreSQL, and MySQL. I also implement JWT and OAuth authentication, authorization, and role-based access control.
On the Store Administration Web Application, I developed a platform for managing store configurations and operational workflows. I built responsive React.js dashboards with reusable components, Redux-based state management, and operational views.
For the Multi Branding (X Billing) Platform, I developed billing services and a React.js administration portal, and integrated Apache Kafka. I also maintained and enhanced the Drive Time Website and Mobile Application, supporting vehicle financing, purchasing, workflow management, and EMI tracking.
