• Developed and maintained backend systems for e-commerce platform using Node.js and Express.js, handling high-volume retail transactions.• Led the development of a recommendation engine, integrating with third-party services to provide personalized product suggestions, which increased sales by 15%.• Built and optimized RESTful APIs, ensuring efficient communication between the frontend and backend systems, leading to a 25% improvement in page load times.• Worked on inventory management systems, enabling real-time stock updates across multiple stores, reducing out-of-stock incidents by 20%.• Collaborated with data scientists to implement analytics dashboards, providing insights into customer behavior and sales trends.• Enhanced security protocols by implementing JWT for secure user sessions, improving customer data protection.• Trained and mentored junior developers, sharing best practices in Node.js, Express.js, and API development.

• Developed advertising system using Node backend and React, Angular frontend.• Implemented responsive and mobile-friendly designs, ensuring a consistent user experience across devices.• Collaborated with designers and artists to bring innovative ideas to life, creating engaging and visually appealing web applications.• Implemented real-time data updates using WebSockets, enhancing the interactivity of the web applications.• Provided technical support during product launches, ensuring smooth rollouts and resolving any issues that arose post launch.• Participated in code reviews and contributed to improving the overall quality and maintainability of the frontend codebase.

• Led the development of payment processing system, utilizing Node.js and MongoDB to handle millions of transactions daily.• Architected and implemented a micro-services-based architecture, reducing transaction processing times by 35% and improving system reliability.• Developed RESTful APIs to support various payment gateways and services, ensuring seamless integration with third-party applications.• Enhanced platform security by implementing OAuth2.0 and JWT for user authentication and authorization, reducing fraud incidents by 20%.• Optimized database performance, reducing query response times by 30% through indexing and query optimization techniques.• Collaborated with frontend teams to integrate APIs with React-based user interfaces, improving the user experience and transaction success rates.

• Contributed to the development of online shopping platform, focusing on backend services using Node.js and MySQL.• Developed and optimized SQL queries, reducing database load times by 20% and improving overall system performance.• Implemented key features such as real-time order tracking and customer notifications, enhancing the online shopping experience.• Built RESTful APIs to support mobile and web applications, ensuring a consistent and seamless user experience across platforms.• Worked closely with marketing teams to develop features that supported promotional campaigns, leading to a 30% increase in online sales during key events.