John Chang

- Responsible for key‑coding tasks frontend with React.js && React Native and API building with Node.js/TypeScript. - Developed 15+ full‑stack web applications which processed, analyzed and rendered data visually. - Improved and optimized the main website’s UI for a seamless customer experience with React.js. *** Key achievement *** : Decreased development period by 15% by refactoring project structure. https://www.autobyoffer.com/ (React + Express) https://www.tastemade.com/ (React + Next.js + Node.js)

- Built over 500 APIs for Kiosk Service with Express.js/TypeScript - worked with relational DBs and NoSQL databases (MongoDB, Firebase) Other helpful skills/experience - Testing, Debugging and Quickly responding to critical support issues *** Key achievement *** : Contributed to delivering apps using React and Firebase with 100% on‑time records.

- Struggled to make a vivid improvement in the CMx project. - Created a web app MVP for a delivery management platform with 100+ business customers to create, manage, and monitor deliveries using React and Redux. *** Key achievement ***: Improved the page speed by 15% https://live.contractexperience.com (CMx project)

- Had a good understanding of how React works under the hood. - Worked alongside product managers to re‑architect a multi‑page web app into a single‑page web app built in React resulting in a yearly revenue lift of $1.1M. - Added new features to a real estate app with 5,000+ monthly active users to enable the uploading of image and video content using React and Redux. *** Key achievement *** : Improved UX/UI features using React for 100% customer convenience.

- Developed websites and mobile applications for over 20 clients. - Designed and Developed an integrated management system from scratch. - Helped multiple clients finalize problematic projects by providing the needed expertise to bring projects to release. *** Key achievement *** : revamping the website of a real estate company, helped the client experience a 300 % increase in the sale of real estate.