Designed and developed E-commerce, Fintech SaaS platforms using TypeScript, React.js, Next.js, Node.js, Nest.js, GraphQL, PostgreSQL, MongoDB, AWS and other technologies. Drove design sessions and guided the development of an innovative system architecture, leveraging Domain-Driven Design and Event-Driven Architecture. Applied Test-Driven Development (TDD) practices to guarantee solid and high-quality code for the team, leading to a 35% decrease in defect rates. Built a Micro-frontend architecture using React.js and as a result, scalability and reusability were guaranteed. Migrated Page routing to App routing in Next.js to improve the performance of the entire front end application. Implemented lazy loading and code splitting techniques to enhance application performance and reduce load times. Optimized the front-end performance by leveraging Tailwind CSS utility classes and minimizing unnecessary re- renders through efficient state management with Zustand. Leveraged RESTful APIs and GraphQL to enable efficient and seamless data interchange between frontend and backend systems, enhancing application performance and user experience. Implemented Authentication and Authorization mechanisms using JWT and OAuth2 to protect sensitive user data. Developed and integrated several payment methods including Apple, Google, Ali-pay, We-chat, Stripe and others. Implemented CI/CD pipelines using tools such as Docker, Kubernetes, AWS serveices and GitHub Actions, reducing the time for releases from days to minutes. Collaborated in Agile meetings, actively contributing to sprint planning (for 2 weeks) by providing valuable recommendations, facilitating efficient project execution. Mentored 3 junior developers, fostering skill development and team growth.

Implemented the multi-tenant OTT SaaS platform that provides Content Management System(CMS) and Online-Store globally. Built frontend applications with React.js and Next.js, emphasizing responsive design, user-friendly interfaces, and high performance. Developed the Content Dashboard using D3.js to enable the customers to easily analyze and integrate large-scale data. Migrated a monolithic application to a Microservice architecture using Nest.js, leading to enhanced scalability and performance. Developed a scalable Database architecture and Caching system to enhance overall system performance. Wrote comprehensive unit, integration, and end-to-end tests using Jest and Playwright, ensuring the application's stability and resilience. Deployed and maintained applications on Google Cloud Platform (GCP) for scalable and reliable infrastructure. Built the Content Search Service using AWS Elastic Search to improve the performance and implemented indexing and catagorization for database performance. Worked in an Agile environment with daily standups, sprints and retrospectives.

-Implemented the large SaaS(Software as a Service) platform which provides the Online Product Configurators. -Successfully launched AI-powered E-Commerce web application which delivery high-quality software solutions within tight deadlines. -Refactored the old code which is written by PHP into modern javascript frameworks like React and Node. -Developed a user friendly interface using React and AntD and implemented the mobile application for better UI/UX. -Participated in hiring process to test the candidates' technical skill. -Participated in 200+ code reviews to ensure the code quality and gained great mentorship

-Developed CSR web applications with React.js, Vue.js, Node.js, Redux, PostgreSQL and MongoDB. -Built out CMS with Vue.js-based frontend and Node.js-based backend to implement the user friendly interface. -Participated 30+ Figma designs and create 50+ Landing pages by using HTML, CSS and JavaScript. -Optimized components for maximum performance on a wide range of web-capable devices and browsers. -Developed and implemented new computational algorithms and software tools. -Wrote 200+ unit tests using Jest and Cypress to ensure the performance of APIs. -Used Slack for team communication and used Git for version control tool.