Stack Engineer React Js

SIMON LIU

Quincy, MA ***** 781-***-**** *****.******@*****.*** LinkedIn

Summary

Full Stack Engineer with 3+ years of experience designing and delivering scalable, user-centric web applications in JavaScript, React.js, Node.js, and TypeScript. Expertise in REST APIs, microservices, CI/CD pipelines (Jenkins, GitHub Actions), AWS (EC2, Docker, Nginx), and front-end optimization. Proven ability to modernize legacy systems, improve performance (40% faster load times), reduce onboarding time (70%), and strengthen fraud prevention. Adept at working in Agile/Scrum environments, collaborating with cross-functional teams, and ensuring high-quality, test-driven code delivery.

Professional Experience

American Express May 2024 - May 2025

Full Stack Enginee Phoenix, AZ

• Migrated enterprise applications from AngularJS to React.js, improving UI responsiveness and system performance by 40%.

• Built reusable UI components with React, Redux, and TypeScript, cutting development time for new features by 25%.

• Developed server-side rendered apps (Next.js), reducing initial load time by 40% and improving SEO.

• Integrated file upload workflows with React Drop-Zone, streamlining customer digital submissions.

• Implemented responsive design and advanced CSS media queries, optimizing mobile user experience.

• Improved API response handling for faster data rendering and reduced latency.

• Partnered with UX designers using Figma to translate wireframes into functional UI.

•Achieved 100% automated test coverage with Jest & React Testing Library, cutting post-release issues by 25%.

•Collaborated with backend engineers to ensure seamless API integration and microservices communication.

American Express Aug 2022 - May 2024

Full Stack Engineer Phoenix, AZ

•Designed and deployed secure REST APIs with Node.js, Express.js, and JWT authentication, strengthening fraud detection systems.

•Automated employee onboarding processes with Python and Shell scripting, reducing setup time by 70%.

•Managed containerized deployments (Docker, Nginx) and automated pipelines with Jenkins & GitHub Actions, ensuring reliable releases.

•Utilized Splunk for real-time monitoring and performance optimization, improving system reliability.

• Built internal tools for data management and reporting, enhancing fraud and risk operations.

• Contributed to Agile sprints using Rally, applying Scrum best practices to meet deadlines efficiently.

TECHNICAL SKILLS

•Languages: JavaScript, TypeScript, HTML5, CSS3, SCSS, Python, Java, SQL

•Frameworks/Libraries: React.js, Redux, Node.js, Express.js, Next.js, Jest, Enzyme, React Testing Library

•Databases: PostgreSQL, Apache CouchDB, MySQL

•DevOps & Tools: Jenkins, GitHub Actions, Docker, Webpack, Nginx, Postman, Swagger, JWT, Figma, Splunk

•Cloud Platforms: AWS (EC2)

•Other: Agile/Scrum, CI/CD, RESTful APIs, Responsive Design, Cross-Browser Compatibility

•Code Quality: Testable code, Well-documented code

•Communication & Problem Solving: Advanced English fluency, Proactive problem solver, Soft-skill development, Digital transfor- mation

Education and Training

University of Massachusetts Boston

Bachelor of Science, Computer Science

Dec 2021

Contact this candidate