Freelancer profile translated to English.
Back to original languageAbout Karsten
With over 15 years of hands-on experience in frontend development, I specialize in the development, optimization, and strategic advancement of Shopify webshops. I support companies not only technically but also through consulting to improve their e-commerce processes, identify conversion potentials, and achieve sustainable growth.
Through my combination of technical expertise and a deep understanding of e-commerce, UX, and SEO, I guide projects holistically – from implementation to continuous optimization in live operation.
Skills:
- Specialization in Shopify (incl. headless architectures with Next.js/React) as well as custom frontend development with modern web technologies.
- Consulting and implementation of e-commerce strategies with a focus on conversion optimization, UX, and performance.
- Development and integration of headless CMS solutions based on Storyblok into scalable e-commerce setups.
- In-depth understanding of the Shopify platform, including APIs, app ecosystem, and integrations (e.g., ERP, tracking, marketing tools).
- Data-driven SEO and tracking strategies for sustainable increases in visibility, traffic, and revenue.
Further information atkarstenbiedermann.tech
German
Native or bilingual
English
Conversational
Can work on-site
Leipzig (up to 50km)
Experience
- Claire (weclaire.com)Claire – AI-first Project Management Tool.April 2025 - Today (1 year and 4 months)Leipzig, GermanyClaire is an AI-first project management tool that I am developing as a solo founder. Positioned as a calm, minimal alternative to Trello, ClickUp, and Asana. I built the product entirely myself: frontend, backend, UX, and go-to-market.Stack: Next.js, Supabase (EU region), Vercel, Resend. GDPR compliant. AI features like summaries, smart tasks, and chat are integrated, with a BYOK model.weclaire.com
- Greenic GmbHE-commerce Strategy · Shopify Architecture · UX/UI Optimization · Technical Conception · ConsultingFebruary 2026 - April 2026 (2 months)For greenic GmbH, I significantly supported and implemented the pivotal re-conceptualization of the e-commerce strategy. The focus was on the strategic realignment of the Shopify setup as well as the clear sharpening of digital sales processes.Through targeted UX and UI optimizations, the entire customer journey was significantly improved and the sales strategy strengthened. In parallel, I created a stable technical foundation that enables scalability and efficiently supports future e-commerce developments.
- HunterE-commerce Strategy · UX/UI Optimization · Technical Conception · ConsultingE-COMMERCEOctober 2024 - Today (1 year and 10 months)Hunter is a family business from Bielefeld, founded in 1980. The company produces high-quality accessories for dogs and cats, mostly in Germany. With around 170 employees, Hunter combines tradition and innovation.I worked as a developer and consultant on a headless e-commerce platform (Shopify Headless, Hydrogen, React) and was responsible for the technical conception as well as the optimization of the conversion rate and key e-commerce KPIs. This included ensuring the maintainability, performance, and supportability of the solution, as well as close coordination with internal stakeholders and external partners.
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Certifications
- Shopify Liquid Storefront for Theme DevelopersShopify2023
- TYPO3 IntegratorTYPO32011