• Backend development and maintenance of the device management platform. • System architecture design including modular APIs and PostgreSQL schema. • Built automation software for factory production lines. • Migrated legacy projects to NestJS; initiated new projects with over 95% test coverage. • Developed heartbeat monitoring using AWS SQS, EventBridge, Lambda, DynamoDB, and CloudWatch. • Built AWS & Azure cost portals and Electron apps with RDM integration and auto-update. • Rewrote a Node.js keystore generator into Golang and deployed as AWS Lambda.

• Technical lead in a Scrum team; supported planning and project direction. • Developed a real-time dynamic pricing system using microservices and multi-layer caching. • Improved MySQL performance through schema and query optimization.

• Led 13+ engineers across frontend, backend, DevOps, iOS, and Android. • Oversaw project planning, resource allocation, and code review processes. • Built horizontally scalable systems with Redis and MySQL. • Launched limited-coupon system (PHP/Node.js) that increased revenue by 30%.

• Mentored junior engineers; ensured on-time delivery and cross-team collaboration. • Built a product crawler (Puppeteer) saving 60% manual work. • Developed token-based auth and RBAC; improved DB performance with Redis caching.

• Developed eCommerce platform, internal ERP, and native mobile apps. • Migrated services from EC2 to ECS; refactored frontend with AngularJS. • Integrated convenience store payments and reconciliation into backend systems. • Used PHP MVC, MySQL, Redis, Objective-C, Java, AWS stack.

• Designed game database and APIs; developed Flash-based browser games. • Created backend admin panels for game operators using PHP and MySQL.

• Managed and mentored a team of three full-stack engineers, ensuring timely project delivery and team growth. • Planned and developed the main portal website for the gaming platform, integrating multiple game services into a unified entry experience. • Designed and implemented a game points wallet system, supporting point top-up, deduction, and transaction history queries. • Developed wallet API integration modules to enable interoperability and synchronization with third-party platforms. • Built a game membership system with account registration, login authentication, and member profile management features.

• Built custom marketing websites and blog systems using WordPress. • Integrated third-party payment APIs using PHP, HTML, CSS, jQuery.

• Built custom marketing websites and blog systems using WordPress. • Integrated third-party payment APIs using PHP, HTML, CSS, jQuery.

• Developed internal ERP websites using Classic ASP. • Built control UIs and testing tools for IP cameras with C++, HTML, JavaScript, CSS.