 Designed distributed servers and databases (centralized and general) for Asia, Europe and America regions.  Designed and developed a scalable image training and generation system using prompt engineering and fine- tuning.  Contributed to the development of an AI-powered processing system by integrating ML algorithms, LLMs, and RAG to enhance data processing capabilities.  Implemented a RAG-based approach to improve the performance of a customer support chatbot.  Optimized AWS costs and implemented CI/CD pipelines for efficient deployment.  Customized AWS S3 and EFS for cost efficiency and improved storage management.  Integrated backend and AI servers using SQS and SNS for seamless message processing.  Managed monitoring services and Jira board for streamlined project tracking and incident management.  Developed and integrated payment methods (Apple Pay, Google Pay).  Optimized search engine performance with database indexing, caching, and pagination techniques.  Built a crypto payment system leveraging Solidity and Rust for secure transactions.  Integrated third-party services(SMS, push notifications, CMS, email, WhatsApp).  Implemented comprehensive test cases following Test-Driven Development (TDD) principles.  Developed frontend, backend, and CMS products to support business applications.

 Designed and maintained cloud architecture using AWS CDK.  Implemented image optimization for improved performance and efficiency.  Developed NFT marketplace APIs, including RESTful API, GraphQL API, and serverless API.  Integrated Elasticsearch for NFT (ERC721, ERC1155, etc.) search.  Implemented cross-chain purchase and swap functionalities using CCIP/CCTP protocols.  Built frontend with Next.js and Amplify backend for a scalable web application.  Consolidated multiple AWS AppSync APIsinto one integrated system.  Conducted unit, integration, E2E, stress, and A/B testing to ensure system reliability.  Containerized applications using Docker, Kubernetes, and Argo CD for scalable deployment.  Integrated analytics and payment systemsto enhance business operations.  Contributed to NFT smart contracts using Solidity and Rust.  Built an ETL data pipeline to fetch data from multiple DeFi protocols, including Uniswap V3, Liquidity V2, and Aave V3.  Managed version upgrades and utilized project management toolsfor efficient workflow.

● Developed SaaS platforms, shopping, e-commerce, healthcare, and fintech products using Scrum and Test-Driven Development (TDD). ● Built microservices with Express.js, NestJS, GraphQL, and RESTful APIs, implementing CI/CD pipelines (GitLab/GitHub) and deploying on AWS. ● Created a centralized component library using Storybook, Chromatic, and other tools to improve UI consistency. ● Developed MERN and MEAN stack applications for full-stack web solutions. ● Implemented unit, integration, and E2E tests to ensure software reliability. ● Maintained Infrastructure as Code (IaC) using Terraform, Ansible, and other automation tools. ● Mastered containerization, orchestration, serverless computing, and messaging systems for scalable architectures.

● Participated in payment, news, and e-commerce product development using React, TypeScript, and other modern technologies. ● Developed web and mobile backend using Node.js (Express.js) for payment services. ● Built GraphQL and REST APIs using NestJS and Apollo GraphQL, with PostgreSQL as the database. ● Solved dataset challenges by implementing sharding and indexing for database performance optimization. ● Implemented performance monitoring and optimization using Sentry and other third-party tools. ● Ensured security best practices, including access controls, encryption, and secure communication. ● Managed Test-Driven Development (TDD) and implemented CI/CD pipelines using GitLab.