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About Jon Kullberg

Jon Kullberg is a full-stack developer based in Stockholm who designs and builds complete web products, covering work from database schema design to front-end implementation. His portfolio includes selected projects such as a marketing and booking platform for a walking-tour company in Stockholm's Old Town, a website for a family property company in Kristianstad, a booking site for Stockholm countryside roadster tours, and a market-hours clock application. The work spans multiple technologies including SvelteKit, Postgres, TypeScript, GSAP, and Mapbox, with deployment on Vercel. He operates as a solo developer handling both front-end concerns such as interfaces, motion, and accessibility, and operational tasks including APIs, authentication, CI/CD, and observability.