Derryansyah S.

🚀 Senior Frontend & Mobile App Developer | React, React Native, Next.js & Expo I’m a Software Engineer with 5+ years of experience building modern, scalable, and high-performance web and mobile applications using React, React Native, Next.js, Expo, TypeScript, and Astro. I bring a founder-level mindset to every project. I don’t just write code I focus on understanding the business problem, creating meaningful user experiences, and building reliable products that can grow and scale sustainably. Whether you need a responsive website, cross-platform mobile app, SaaS dashboard, e-commerce platform, landing page, or a complete frontend redesign, I can help turn your idea into a polished, production-ready product. ✅ Work directly with me, no agencies or outsourced teams ✅ Fast and transparent communication ✅ Clean, maintainable, and scalable code ✅ Responsive and pixel-perfect UI implementation ✅ Product-focused development, not just code that works ✅ Experience publishing apps to the Apple App Store and Google Play Store ## 💼 Services I Provide 🚀 Frontend Development with React, Next.js, Astro, and Svelte 📱 Cross-Platform Mobile App Development with React Native and Expo 🛒 E-commerce Website and Platform Development 🧠 SaaS Dashboard and Admin Panel Development 🎨 UI/UX Redesign and Frontend Modernization 🧩 REST API, GraphQL, and Third-Party Service Integration 📦 iOS and Android App Publishing 🛠️ React Native, Expo, SDK, and Package Upgrades 📄 Company Profile, Marketing Website, and Landing Page Development 🌐 WordPress Frontend Customization 🧱 Design System and Component Library Development with Storybook ⚡ Performance Optimization and Bug Fixing ## 🧠 Tech Stack Languages JavaScript, TypeScript Frontend & Mobile React, Next.js, React Native, Expo, Astro, Svelte, Framer Motion UI & Design Systems Tailwind CSS, shadcn/ui, Material UI, Ant Design, Flowbite, Storybook State & Data Management TanStack React Query, SWR, Redux Toolkit, Zustand, GraphQL Backend & Integrations Supabase, Firebase, OneSignal, Headless CMS, REST APIs, Third-Party APIs I’m comfortable working on both new products and existing codebases, from building an MVP from scratch to improving performance, upgrading dependencies, fixing complex issues, or redesigning an existing application. Have a web or mobile app idea? Send me a message and let’s discuss how to turn it into a scalable, user-friendly product.