Hans K.

Full Stack Developer | React, NextJS & Node.JS

I’m a Full-Stack Developer specializing in building modern, reliable, and user-friendly web applications. I help businesses turn ideas, designs, and existing products into production-ready applications, whether you need a new application built from scratch, new features added to an existing product, or improvements to an existing codebase. I work across the full development stack, including frontend development, backend APIs, databases, authentication, payments, and third-party integrations. 🔹 What I Can Help You With • Full-stack web application development • React & Next.js applications • Node.js & Express backend development • REST API development and integrations • PostgreSQL, MongoDB, MySQL & Supabase databases • Stripe payments and subscription systems • Authentication and user management • Figma/Sketch designs converted into responsive interfaces • Feature development for existing applications • Bug fixing, code refactoring, and performance improvements • Database and API optimization • React Native & Expo development for cross-platform mobile applications 🛠️ Tech Stack • Frontend: React, Next.js, TailwindCSS, Vite, MUI, GSAP • Backend: Node.js, Express • Databases: PostgreSQL, MongoDB, MySQL, TimescaleDB, Supabase, Redis • Payments: Stripe, Subscription Systems • Mobile: React Native, Expo • Tools: Git, GitHub, Docker, Postman, Jira I focus on writing clean, maintainable code and building applications that are responsive, reliable, and easy to maintain. Whether you're starting a new project or need help improving an existing application, I can work across the stack and help turn your requirements into a working product. 🌍 Languages: English (Fluent) Bahasa Indonesia (Native) ⚡ Ready to collaborate and build something innovative? Let’s connect!