Shopify & Front-End Developer

Darek Mielniczek

20+ years building web products, most of it in e-commerce. I build fast, reliable Shopify stores and front-end systems that hold up under real traffic.

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What I work with

Shopify

  • Liquid & custom theme development
  • Shopify API — REST & GraphQL
  • Custom app development
  • Store migrations (WooCommerce, Shoper → Shopify)

Front-End

  • HTML5, CSS3, modern JavaScript
  • React
  • Accessible, responsive UI

Back-End & Integrations

  • PHP
  • Payment, ERP & CRM integrations
  • Klaviyo & marketing automation

Performance & SEO

  • Core Web Vitals & page speed optimization
  • Technical SEO
  • UX / CRO audits

Let's talk

Open to full-time Shopify / front-end roles, and select freelance projects.

darek@mielniczek.net LinkedIn Download CV

For business / agency inquiries, see crazybeaver.net.