- Contributed to SaveDay's fast-paced development process by integrating third-party services and open-source libraries, while actively participating in the system design process using the 4C model- Established a comprehensive monitoring system with logs, metrics, and traces—known as the Three Pillars of Observability—ensuring the system consistently met four-nine uptime SLA- Successfully migrated all of SaveDay's services from the EKS extended support version, reducing infrastructure costs by nearly $400 per month without downtime, while managing 80% of AWS resources through Infrastructure as Code practices

- Streamlined CI/CD pipelines and established robust monitoring systems while developing automated applications for CI/CD notifications and real-time log analysis, resulting in accelerated product delivery, enhanced reliability, and improved efficiency for the engineering team- Implemented and maintained comprehensive monitoring and log aggregation systems, ensuring continuous system health, improved visibility, and proactive issue resolution- Led the transition from Docker to Kubernetes (EKS), optimizing infrastructure for high availability, cost-efficiency, and secure access with Firezone VPN

- Implemented an end-to-end encrypted chat application based on the Matrix specification, ensuring secure communication and data privacy throughout the messaging platform

- Led a team of 4-6 engineers to optimize and maintain critical Golang-based microservices, ensuring high availability and reliability of company products, while actively collaborating with technical leaders in the design process of new features to enhance system functionality and performance- Implemented a feature environment that streamlined development by allowing engineers to focus solely on code changes, reducing the need to run multiple services locally, and significantly speeding up feature development and verification processes- Implemented solutions to detect and prevent cyberattacks, significantly improving system availability and resilience by ensuring proactive threat mitigation and maintaining uninterrupted service during malicious activity- Streamlined CI/CD processes by migrating from Jenkins to GitLab CI, optimizing build times, and enabling seamless feature deployment with custom CD tools for microservices monitoring- Maintain domain modules for ShopBase, overseeing domain reselling and DNS record management, ensuring robust and reliable service operations

- Developed tracking solutions that enabled Shopify e-commerce sellers to gain valuable insights into buyer behavior, driving informed decision-making and improved sales strategies- Collaborated with engineers to build and enhance checkout and order modules for ShopBase, improving the platform’s functionality and overall user experience- Delivered sitemap, import, and export features for ShopBase’s product modules, streamlining product management and boosting operational efficiency for sellers

- Develop e-commerce system for unifashion.vn / hachivietnam.vn - Develop web for gamstudio.vn / rositagarden.com.vn

- Create a complete drag-and-drop design tool combined with a stock library for non-professional designers with easy-to-use UI/UX under HTML5, CSS3 & JavaScript (Backbone, jQuery)- Build service system for rendering images & .PDF files creating from the tool above, using NodeJs, Redis - Create DesignBold’s homepage transition block by Javascript / jQuery, CSS3

- Create, update plugins for Wordpress under company's service- Optimising homepages & landing pages, also including the agency's own- Debugging and fixing issues reported by the users