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Founder & Web Developer
Frontend and full-stack engineer who builds AI into products. Remote since 2005.
SloveniaFounder & Web Developer at koroCode
My own company again, fully remote from Manila. I take frontend, full-stack and AI product work on contract. First build: matjazkorosec.com, a block-breaker on my own canvas engine and a crab that answers questions about me with a sentence-embedding model running in the browser, no API.
Next.jsNuxt.JsAI assisted DevelopmentTailwindClaude CodeReactVue.JsAI Product Development
Built features in Nuxt UI and Tailwind Variants across 12 international casino brands sharing one Nuxt frontend, for 7M+ players a month, and reviewed pull requests to keep shared code consistent. Tracked down performance and rendering issues, tuning SSR, lazy-loading and asset delivery to keep load times down on high-traffic pages.
Nuxt UITailwind VariantsNuxtVue.JsSSRPerformance OptimizationCode ReviewClaude CodePlaywrightFFMPEG
Took frontend, full-stack and AI product contracts from Manila for teams in Europe, the UK, the US, Canada and Australia. Built matjazkorosec.com, a career site presented as a game and short cartoon stories, using Next.js and TypeScript.
Next.jsTypeScriptReactAI AgentsClaude CodeCodexCMSFrontendFull Stack
Established a Design System that improved UI consistency across 5 projects and cut the time to build new screens by about a third. Aligned 3 departments around a shared integration framework and saw 3 major projects through to delivery. Cut load times by 25% by refining frontend code, which brought bounce rates down 30%.
AngularMaterial DesignStorybookStyle DictionaryDesign SystemsFrontend DevelopmentPerformance Optimization
Built and ran campaign pages and landing sites for US clients, lifting conversion rates by 20%. Reworked layouts for smaller screens, and mobile usage rose 40%.
Vue.JsApostrophe CMSFrontend DevelopmentResponsive DesignConversion Rate Optimization
Led and mentored a team of 5 frontend engineers through the company's shift from agency branded sites to medical applications. Introduced agile practices to the frontend team, shortening delivery cycles. Rebuilt key screens in the medical apps for accessibility, fixing keyboard navigation and contrast problems.
Team LeadershipMentorshipAgileAccessibilityFrontend DevelopmentMedical Applications
Delivered frontend work for Lindt, Red Bull, ABB and Fujifilm: semantic HTML, modular CSS and responsive Angular layouts, plus PHP integrated with Twig templates. Fixed critical production issues on live client sites to agency deadlines.
HTMLCSSAngularPHPTwigResponsive DesignFrontend Development
Shipped 80+ brand sites on Silverstripe CMS for Slovenian and international clients, working day to day with designers, backend developers and project managers. Brought responsive, mobile-first development into the agency in 2010, as the approach was emerging and rolled it out across those projects: 25% more mobile traffic and 50% faster load times.
SilverStripe CMSResponsive DesignMobile FirstFrontend DevelopmentCMS
Completed secondary school at Gymnasium Ptuj, then entered full-time web development in 2001.
Completed secondary school at Gymnasium Ptuj, then entered full-time web development in 2001.