Cong D.

Senior React Native & Next.js Developer | Expo, TypeScript

Hi, I’m Cong — a Senior Full-Stack Mobile Developer with 6+ years of experience building scalable web, mobile, and backend applications. I specialize in cross-platform mobile development using React Native, Expo, and Flutter, combined with modern frontend development using React, Next.js, TypeScript, and Tailwind CSS. On the backend, I have hands-on experience building APIs and backend services with Node.js, Fastify, Django, GraphQL, REST APIs, Prisma, Supabase, and Strapi. I also have experience working with cloud infrastructure and CI/CD workflows using Microsoft Azure, Azure DevOps, Fastlane, and Jenkins. I’m experienced across the full product development lifecycle — from designing frontend and mobile architectures, building backend APIs and integrations, to automated testing, CI/CD, deployment, and performance optimization. ### Skills * **Mobile:** React Native, Expo, Flutter * **Frontend:** React.js, Next.js, Remix, Vite, TypeScript, JavaScript * **State Management:** Redux Toolkit, Zustand, MobX * **UI:** Tailwind CSS, ShadCN UI * **Backend:** Node.js, Fastify, Django, REST APIs, GraphQL * **Database & Backend Services:** Prisma, Supabase, Strapi * **Cloud & DevOps:** Microsoft Azure, Azure DevOps, Fastlane, Jenkins, Firebase * **Integrations:** WebRTC, Maps SDK, Firebase * **Testing:** E2E Testing with Maestro, Performance Testing with k6 ### What I can help with * Cross-platform mobile application development * React Native, Expo, and Flutter applications * Modern React and Next.js web applications * Backend API development with Node.js, Fastify, and Prisma * REST and GraphQL API integrations * Database and backend architecture * Cloud deployment and Azure infrastructure * CI/CD pipeline setup and deployment automation * Real-time features and third-party integrations * E2E and performance testing * Application migration and modernization * Performance optimization and scalability I focus on building clean, maintainable, and scalable solutions while maintaining a strong focus on performance, reliability, and user experience across mobile, web, and backend systems.