Karol Klatd

– aircrafts manufacturer, 1800 employees

– AI enhanced frontend configurator and suggest tool, ecommerce – team of ~7 people – greenfield project | architecture, technical specs, server and env setup from ground up | BFF node api paths, react, vue, python, various LLMs, AI agents, agentic coding | magento integration | data sources & payment integration

As an independent contractor I've led and delivered end-to-end e-commerce solutions on Magento 1/2 and Shopware 5/6 for retailers, wholesalers and international brands. I've handled everything from initial architecture and hosting setup through custom module development, complex ERP/CRM/PIM and payment integrations, to performance tuning for high-traffic shops. My work has included greenfield builds, large-scale refactors, and rescue projects, often joining mid-stream to stabilize platforms, improve reliability, and increase conversion. This long hands-on period across many domains has given me deep practical knowledge of Magento and Shopware internals, upgrade paths, and best practices, as well as the ability to quickly diagnose and fix production issues under pressure. Among end clients you can find: MANN + HUMMEL senior magento developer – Led greenfield Magento 2 project: architecture, technical specs, AEM/SAP integrations via GQL/REST/microservices; cloud/on-prem hybrid setup. – Mentored 15 devs as de facto tech lead; minimized bugs through proactive design and option analysis. – Enabled expansion into new markets (buildings/offices) with performant, scalable backend. STRIX DE senior shopware developer – Maintained/optimized high-load tyre wholesale site (leading Germany): Redis/ElasticSearch/Kibana/New Relic for 20-dev backend team. – Rolled out features and fixed live issues under pressure; system architecture contributions for automotive B2B scale. CGI senior magento developer – Delivered API integrations (REST/GraphQL) and optimizations for food/vet services (150k+ employees); high-traffic maintenance with Redis/Elastic. – Knowledge-shared with seniors; ensured stakeholder alignment on features and refactoring. VERISURE senior magento developer – security company, alarm services, 20k+ employees – team of ~10 people (backend) and ~5 people (frontend)

– software house, 30 employees – team of ~12 people (backend) – rolling out new features | various API integrations | code refactoring, bug fixing

– wine trade and store chain, ~20 employees – whole package, creating magento store from the ground up, integrating with external services, hosting, server config, deployment, maintenance, incident response

– media agency, 8 employees – very varied tasks comprising of creating websites from delivered layouts using frameworks of choice, also maintaining, optimizing and incident response for a few high traffic sites (Orlen marathon, Verva street racing, Fryderyki, Tauron nowa muzyka)

– small businesses, medium companies, large events – everything from flash and lingo to wordpress and joomla with anything from LAMP stack you can imagine in between

– software house, ~40 employees – mainly frontend tasks, taking part in shaping largest polish internet only bank back then (mBank)