Roman K.

Need a front-end developer for a SaaS product, web app, online store or marketing website? Whether you have a Figma design ready to build, need to turn raw ideas into a working design solution, or want a faster, cleaner front-end for an existing product, I deliver production-ready React and Next.js code that stays easy to maintain and scale. I use AI tools like Claude Code to work faster and reduce your costs without sacrificing quality, because every result is checked, polished and verified by me before delivery. 🏆 𝗧𝗥𝗨𝗦𝗧𝗘𝗗 Front-End & UI/UX Design 𝗣𝗔𝗥𝗧𝗡𝗘𝗥 ⦿ Top Rated Plus with a 100% Job Success Score ⦿ 12+ years of web development experience ⦿ 100+ projects delivered on Upwork with Appica Agency ⦿ AI-assisted development with Claude Code and spec-driven workflows ⦿ Creator of Appica UI, an open-source React library with 70+ components ⦿ ThemeForest Elite Author with 5,000+ template sales ⦿ Former Top Seller on the official Bootstrap marketplace ⦿ Founder and Lead Front-End Developer at Createx Studio "Roman is the best front-end developer I have ever worked with. His communication and quality of delivery was brilliant." (Upwork client) 𝗪𝗛𝗔𝗧 𝗜 𝗕𝗨𝗜𝗟𝗗 ⦿ SaaS products and web apps ⦿ Online stores ⦿ Marketing websites ⦿ MVPs ⦿ UI designs and design systems in Figma ⦿ AI-assisted development workflows 𝗧𝗘𝗖𝗛 𝗦𝗧𝗔𝗖𝗞 ⦿ Frameworks: Next.js (my tool of choice), React.js, Astro ⦿ Languages: JavaScript (ES6+), TypeScript, HTML5, CSS3 ⦿ Styling: Tailwind CSS, Bootstrap ⦿ Design tools: Figma, Claude Design, Generative AI ⦿ AI development: Claude Code, AI agents, spec-driven development 𝗪𝗛𝗔𝗧 𝗬𝗢𝗨𝗥 𝗣𝗥𝗢𝗝𝗘𝗖𝗧 𝗚𝗘𝗧𝗦 🤖 AI-assisted development I set up agentic development workflows with Claude Code, including spec-driven development, reusable agent skills and project context files that keep AI output aligned with your design system. This shortens delivery time and lowers your costs, and nothing reaches you until I have personally reviewed it. Our Appica Store template ships with its own agent skills and AGENTS.md guides, so AI coding tools follow its rules from the start. I can also turn AI-generated prototypes into clean, production-ready code. 🧩 Appica UI and Appica Store I created Appica UI, a free, open-source library of accessible React components, and our team used it to build Appica Store, a fully working premium Next.js e-commerce template. WooCommerce, Shopify and other versions are on the way, along with more templates. That experience goes straight into client work: accessible React components, complex e-commerce flows and clean API integration. ⭐ ThemeForest Elite Author and former Bootstrap Top Seller At Createx Studio, I've built premium templates such as Cartzilla for thousands of buyers worldwide. When that many people use and customize the same code, it has to be scalable and maintainable. I bring the same standards to custom projects: efficient design systems and reusable components that keep your product consistent and make new features faster to add. 🎨 From raw idea to production code I design in Figma as well as code, so I can turn a rough idea into a working design solution and then build it. I also translate existing Figma files into fully responsive, pixel-perfect interfaces without losing the design vision or compromising on loading speed. I work alone or with our agency's Lead Designer. If you have a design to build or a front-end to improve, send me a message here on Upwork and let's discuss your project.