• Established and expanded the front-end team, growing it from 1 to 4 engineers by conducting interviews, onboarding new hires, designing the development process, and mentoring junior engineers. • Reduced API request redundancy by over 90% and improved page load times by 50% through the introduction of react-query and react-use-websocket. • Successfully transitioned the project from vanilla JS to React, resolving stability challenges through collaboration with the PM, ensuring feature accuracy and consistency across different environments. • Collaborated with designers and PMs to select MUI as the UI framework based on user requirements and technical constraints. • Continuously learned and introduced TypeScript into the project, improving stability and maintainability. • Managed version control using GitLab Flow and created automation scripts to improve junior engineers' workflow efficiency. • Trained designers on file type selection and optimized file sizes, improving performance by reducing the impact of large files. • Created comprehensive documentation in Notion for customer service teams, reducing front-end support time for customer service from 1 hour per day to 3 hours per month.

• Collaborated closely with PMs to create report-related UI mockups by adjusting HTML and documenting designs through screenshots while clarifying product specifications, which reduced the need for 2/3 of feature adjustment meetings related to UI corrections. • Applied approved troubleshooting methods to identify client-side errors and vulnerabilities while assisting with the integration of advertisement pages. • Introduced TypeScript using JSDoc to enhance product stability, reducing incidents from once a week to once every six months. • Modularized UI components to accelerate development speed and reduce redesign timelines to one week. • Participated in weekly team discussions to explore and compare new technologies, enhancing the team's collective knowledge and fostering a culture of continuous improvement. • Collaborated with the QA team to establish a structured testing process, implementing testing specifications that included manual tests by team members and automated testing in the pre-production phase, ultimately ensuring product quality and stability.

• Developed a work management system using Spring Boot, enhancing the team's task tracking and management efficiency. • Refactored C# and search conditions, enhancing Oracle database performance and doubling both search and API efficiency, while maintaining system stability and driving continuous improvements. • Migrated the front-end from ExtJS to Angular and utilized D3.js for data visualization, incorporating user interaction features to enhance the overall experience. • Established a VMware environment to streamline product delivery, enabling clients to easily set up the system in environments without external network access. • Collaborated with team members to troubleshoot technical issues and propose optimization solutions. • Tested methodology with writing and execution of test plans, debugging and testing scripts and tools.