Zining Cen

Developed a cross-platform AI recycling rewards app using React Native, Expo, and JavaScript, delivering a sleek and user-friendly interface that increased early tester engagement by 35%. Architected and built scalable backend services with Node.js and Express.js, designing modular RESTful APIs that reduced code redundancy. Enhanced relational database (MySQL) query performance by refactoring complex joins and implementing indexing strategies, resulting in a 20% faster response time during user testing sessions. Worked in an agile environment, writing unit tests for backend using Jest and Supertest to ensure 90% coverage for APIs in 3 modules, enabling early bug detection and faster iterations. Developed secure, PCI-compliant payment workflows using Stripe for peer-to-peer reward redemptions, including error handling for seamless transaction flow in a pre-production environment.

Developed a responsive WooCommerce site on WordPress, customizing PHP templates and SCSS to match ShopEZ’s brand aesthetics. Integrated Stripe and PayPal payment gateways with SSL encryption and PCI-compliant checkout workflows. Built a custom PHP/MySQL inventory plugin for real-time stock management and automated order-status tracking. Translated Figma UI/UX designs into polished HTML5, CSS3, and vanilla JavaScript components for mobile-first responsiveness.

Built responsive, client-facing platforms using React.js and TypeScript, incorporating dynamic tables with pagination, filtering, and sorting through optimized asynchronous data fetching. Enhanced user experience by 30% by implementing efficient state management with useState and useEffect, ensuring real-time data synchronization and smooth interactions. Optimized UI performance by using useRef for direct DOM manipulation, reducing unnecessary re-renders and improving component rendering speed. Streamlined application state management with Redux, enabling predictable data flows and easier maintenance across complex component hierarchies. Owned end-to-end feature development from concept to deployment, translating UI/UX wireframes into responsive React components and collaborating with cross-functional teams for solutions.