-Designed and implemented a microservices architecture, improving system scalability by 40%. -Enhanced frontend performance, reducing page load times by 35% through optimized code andlazy loading. -Developed cloud-based applications using Google Cloud Platform, leveraging services such asCompute Engine and Cloud Storage. -Automated infrastructure provisioning and deployment using Terraform, ensuring consistentand repeatable environments. -Deployed and managed Kubernetes clusters to improve application deployment and scalingefficiency. -Utilized cutting-edge web development techniques such as server-side rendering (SSR), codesplitting, static site generation (SSG), and lazy loading for performance optimization and SEOfriendly. -Implemented GraphQL APIs following the Apollo GraphQL, both on the server and client sides, toenhance data querying and manipulation.-Developed a real-time messaging system using Socket.io to facilitate instant communication andimprove user engagement. -Collaborated with cross-functional teams to develop and maintain web applications usingAgile/Scrum methodologies. -Integrated with third-party APIs with GoinGeko, 0xAPI, CoinMaket API, third-web API, and so on-Established and maintained the CI/CD workflow with Github Action, Jenkins, AWS, Docker, andKubernetes

-Implemented RESTful APIs with FastAPI, enhancing backend performance and scalability. -Deployed containerized applications using Docker and Kubernetes, improving deploymentefficiency by 30%. -Built real-time data visualization components using D3.js, resulting in a 25% increase in userengagement. -Optimized SQL queries, improving data retrieval times by 50%. -Designed and hand-on developed the robust APIs, transaction data structure, and databaseschema-Experienced with Node.js, ExpressJS, and NestJS building the RESTful APIs and GraphQL queryand mutations -Built the REST and GraphQL API protocols, using routing-controller and Apollo GraphQL -Utilized the SQL databases including PostgreSQL and MySQL with TypeORM and Prisma ORM asan Object Relation Mapping tool -Implemented best practices in Microservices architecture to enhance scalability andperformance-Implemented authentication and authorization (OAuth, 2FA, JWT, and Passkey – passwordless)to enhance user security and streamline login processes, ensuring the protection of user data. -Created the real-time messaging system with websocket, using RabbitMQ as a message broker -Built the video meeting (group meeting, peer to peer meeting) with zoom script -Integrated with third-party APIs such as Google Map API, Uber Eat API, Twilio service (video andvoice call, SMS, email verification), and Stripe Payment service

-Integrated with backend APIs to display user information and chat history, enhancing userexperience. -Utilized RxJS for efficient state management, resulting in smoother user interactions -Improved mobile responsiveness, increasing mobile user engagement by 20%.-Implemented real-time messaging features with Socket.io, improving customer supportresponse time by 35%.