Freelance web developer, performance marketer and AI integrator with 15+ years of project experience.
My focus: technical SEO, conversion optimization, API integration, CMS/shop architecture and practical use of AI & automation tools in web projects.
Advised over 200 clients from various industries, especially IT and creative sectors.
Technical SEO for an international e-commerce shop: carried out technical SEO audits including speed and mobile optimization and URL structure improvements, leading to significant visibility and conversion gains.
SEO audits and on-page optimization: detailed SEO audits and fixing technical issues for SMEs, implementing on-page optimizations to improve search rankings.
E-commerce shop relaunch: concept and execution of a full shop relaunch including mobile optimization, modern payment system integration and technical SEO audits to ensure performance.
Developing a digital marketing strategy: creating a comprehensive online marketing plan for a startup (SEO, SEA, content, social media). Set up and managed social media and implemented a CMS.
WordPress websites: built and customized multiple corporate sites with WordPress, including theme tweaks and plugin integration. Trained clients on self-management.
Custom CMS: programmed a tailor-made CMS for the creative sector with user-friendly interfaces and SEO modules.
Shopware migration: redesigned and migrated an e-commerce site to Shopware focusing on performance, usability and conversion optimization.
Magento Cloud migration: complete redesign and migration to Adobe Magento Cloud for international e-commerce businesses with advanced features and speed optimizations.
Stefan-Josef Mironczyk | Web Development · E-Commerce · AI Automation · SEO
For over 15 years I’ve helped companies rebuild their digital platforms, optimize them measurably, and run them at scale—from corporate relaunches to international online shops. I combine deep technical know-how (WordPress, Shopware, Magento, Shopify, API architectures) with performance marketing, technical SEO/SEA, and cutting-edge AI automation.
What I deliver for clients
Technologies & Tools (selection) CMS/shops: WordPress, Shopware, Magento, WooCommerce, Shopify Frontend/backend: HTML5, CSS3, PHP, JS/React, MySQL Analysis & SEO: GA4, GTM, Sistrix, SEMrush, Screaming Frog AI & automation: ChatGPT, Claude, DeepSeek, Qwen, Ollama, OpenRouter, n8n, Make Collaboration: Jira, Confluence, Notion, Figma, Adobe CC
Why clients work with me
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