Check matjazkorosec.com
I am an AI product engineer and senior frontend/full-stack developer with 25 years of experience building websites, digital products, and scalable web applications. I have delivered more than 150 launches across 30+ countries, from agency websites to high-traffic product platforms serving millions of users.
I build frontend experiences with React, Next.js, Vue, Nuxt, TypeScript, and modern CSS systems. On the backend, I work with Node.js, PHP, REST APIs, CMS platforms, and relational and document databases to take products from initial concept through production.
I use AI engineering tools such as Claude Code and Codex daily, applying agent workflows, browser-based embeddings, evaluations, and automation where they create practical value. I also know when conventional code is more reliable, economical, and appropriate than AI.
I have led frontend teams, established design systems, introduced agile practices, reviewed code, and mentored engineers. My work emphasizes accessibility, responsive design, semantic markup, performance, SSR, maintainability, and shared component architecture.
I have worked remotely since 2005 and am based in Manila, Philippines. I collaborate with distributed teams across Europe, the United Kingdom, North America, Canada, and Australia, and can adapt my working hours to a team's needs.
I am open to frontend, full-stack, and AI product engineering engagements where I can help teams ship high-quality products, improve technical foundations, and turn complex requirements into usable software.
I take on remote frontend, full-stack, and AI product engineering contracts for teams in Europe, the UK, the US, Canada, and Australia from Manila.
I built matjazkorosec.com in Next.js and TypeScript, using AI agents for implementation while setting technical direction and verifying quality. The site includes a browser-based CV question-answering experience powered by sentence embeddings, with no API cost and a 327-question evaluation suite.
Built shared Nuxt UI and Tailwind Variants features for 12 international casino brands on a common Nuxt frontend serving more than 7 million players per month. Reviewed pull requests and helped maintain consistency across the shared codebase.
Investigated rendering and performance issues, improving SSR, lazy loading, and asset delivery. Built an AI-assisted back-office task application with Claude Code, Playwright, on-device voices, FFmpeg, multilingual captions, and editable recorded workflows for onboarding and support.
Delivered remote frontend and full-stack contract work for international clients. Worked directly with stakeholders and designers from discovery through launch.
Built a custom CMS for a dental practice with a React and Next.js frontend. Served as sole developer and designed the system so non-technical staff could manage content independently.
Established a design system that improved UI consistency across five projects and reduced new-screen implementation time by approximately one third. Coordinated three departments around a shared integration framework and delivered major projects through launch.
Improved frontend performance to reduce load times by 25% and bounce rates by 30%. Created 40 reusable Angular Material components, documented them in Storybook, and exported design tokens through Style Dictionary.
Built and maintained campaign pages and landing sites for US clients in a part-time remote role. Improved campaign conversion rates by 20% and redesigned smaller-screen layouts, contributing to a 40% increase in mobile usage.
Created an interactive popup feature with Vue and Apostrophe CMS that tripled sales for the campaign where it was deployed.
Led and mentored a team of five frontend engineers during the company's transition from branded agency websites to medical applications. Introduced agile practices that shortened delivery cycles.
Improved accessibility in medical application screens by addressing keyboard navigation and contrast issues. Participated in client planning sessions for A1, helping define feasible scope earlier in the delivery process.
Delivered frontend work for major clients including Lindt, Red Bull, ABB, and Fujifilm. Built semantic HTML, modular CSS, responsive Angular layouts, and PHP integrations using Twig templates.
Resolved critical production issues on live client websites while meeting agency delivery deadlines.
Shipped more than 80 brand websites using Silverstripe CMS for Slovenian and international clients. Collaborated daily with designers, backend developers, and project managers across agency engagements.
Introduced responsive, mobile-first development practices to the agency in 2010 and applied them across projects. This contributed to 25% more mobile traffic and 50% faster load times.
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