Available to hire
Senior Shopify Plus developer with 7+ years building and scaling eCommerce storefronts across Europe and the US. Specialties include liquid theme development, custom app development, headless Hydrogen commerce, and Shopify API integrations, with experience migrating legacy WooCommerce/Magento stores to Shopify Plus and improving performance and maintainability.
Skilled in Core Web Vitals optimization, multi-currency/multi-market deployments, SEO/Affinity data markup/AMP improvements, and API-first architectures (including webhooks and GraphQL). Experienced collaborating with designers, marketers, and product managers to deliver high-traffic enterprise commerce solutions and reduce ongoing maintenance costs significantly.
Skills
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Language
Polish
Fluent
English
Advanced
Work Experience
Senior Shopify Developer at Lightspace bullets
October 1, 2022 - February 1, 2026Led end-to-end development of 15 custom Shopify stores, improving site speed and checkout conversion through Liquid optimization, JavaScript performance tuning, and headless implementations using Hydrogen (Remix-based). Designed and deployed Shopify apps for inventory management and personalized product recommendations, integrating Klaviyo email automation and Stripe payment processing. Partnered with designers, marketers, and product managers to migrate legacy WooCommerce and Magento sites to Shopify Plus, reducing ongoing maintenance costs by ~40% and improving mobile performance. Conducted SEO audits and implemented schema markup, AMP pages, and metadata strategies to improve organic search visibility. Mentored junior developers on Shopify GraphQL API best practices and theme architecture, establishing code review standards to reduce rework. Optimized store frontends for global markets with multi-currency support, localization, and GDPR-compliant data handling for European and Asian
Senior Shopify Developer at Lightspace
February 1, 2022 - February 1, 2026Led end-to-end development of 15 custom Shopify stores, improving site speed and checkout conversion through Liquid templating, JavaScript performance tuning, and headless implementations using Hydrogen (Remix-based) for flagship clients. Optimized Core Web Vitals, implemented multi-currency support and localization for European and US markets, and supported Shopify Plus migrations. Drove UX improvements and collaborated with product teams to deliver scalable ecommerce experiences.
Senior Shopify & Full Stack Developer at Applepie Berlin
February 1, 2021 - July 1, 2022Developed and maintained 10+ enterprise-level Shopify themes from scratch using HTML5, CSS3 (Sass/SCSS), and vanilla JavaScript, delivering responsive, pixel-perfect designs compliant with WCAG 2.1 AA. Integrated advanced commerce features including product bundling and subscription models via Recharge, increasing average order value. Diagnosed and resolved complex high-traffic issues by implementing Cloudflare caching and lazy-loading techniques to achieve sub-2-second page loads. Built custom sections/snippets for Shopify Online Store 2.0 to enable non-technical teams to update content independently and reduce content turnaround time by ~50%. Delivered API-driven agile solutions, including webhook integrations for real-time order syncing with SAP ERP systems across multiple European markets. Contributed to and shipped open-source Shopify community resources, sharing tutorials on metafield usage and earned recognition from the Shopify Partner ecosystem.
Senior Shopify & Full Stack Developer at Apple Pie Berlin
February 1, 2021 - July 1, 2022Developed and maintained 10+ enterprise-level Shopify themes from scratch using HTML5, CSS3 (Sass/SCSS), and vanilla JavaScript, delivering pixel-perfect, responsive designs compliant WCAG 2.1 AA accessibility standards. Integrated advanced commerce features including product bundling and subscription models via Recharge, increasing average order value across client stores. Created scalable front-end solutions for multi-market deployments and optimized performance.
Junior Shopify & Full Stack Developer at Kilowatt
February 1, 2018 - November 1, 2020Customized Shopify themes to create fully responsive online stores, improving overall user experience and client satisfaction metrics. Developed reusable components and templates, enabling faster delivery of future projects and reducing development time by roughly 40% on subsequent builds. Enhanced site search capabilities and implemented advanced filtering systems, improving product discoverability and conversions. Collaborated closely with cross-functional teams to develop customized Shopify solutions aligned with client business goals. Migrated several legacy platform stores to Shopify, overseeing end-to-end migration with minimal disruption to client operations. Proactively resolved technical issues to maintain store performance and stability.
Shopify Front End Developer (Intern) at Brand Active
October 1, 2017 - February 1, 2018Customized mid-sized Shopify stores focusing on theme modifications using Liquid, AJAX cart updates, and CSS animations to create engaging, brand-aligned user interfaces. Supported integration of essential apps including Oberlo (dropshipping) and Judge.me (reviews), streamlining operations for startups and small businesses across the Polish and Central European markets. Performed routine maintenance including bug fixes, security updates, and performance monitoring using Google PageSpeed Insights under senior developer supervision. Collaborated on custom checkout flows and abandoned cart recovery systems to improve client recovery rates. Gained foundational experience with Shopify admin panel, Ruby scripting within Shopify’s environment, and cross-browser compatibility testing. Worked with local marketing teams to run A/B tests on product pages, optimizing CTAs and product imagery to support higher click-through rates.
Shopify Front End Developer Intern at Brand Active
October 1, 2017 - February 1, 2018Assisted in customizing 8 mid-sized Shopify stores, focusing on theme modifications using Liquid, AJAX cart updates, and CSS animations to create engaging, brand-aligned user interfaces. Supported integration of essential apps including Oberlo and Judge.me (reviews), streamlining operations for startups and small businesses in the Polish and Central European markets. Performed routine maintenance including bug fixes, security updates, and performance monitoring with Google PageSpeed Insights under the supervision of senior developers. Collaborated on custom checkout flows and abandoned cart recovery initiatives to improve recovery rates.
Education
Bachelor's Degree in Computer Science at SWPS University
September 1, 2013 - July 1, 2017Bachelor's Degree in Computer Science at SWPS University
September 1, 2013 - July 1, 2017Bachelor's Degree in Computer Science at SWPS University
September 1, 2013 - July 1, 2017Bachelor's Degree in Computer Science at SWPS University
September 1, 2013 - July 1, 2017Qualifications
Industry Experience
Software & Internet, Retail, Professional Services, Media & Entertainment, Computers & Electronics
Skills
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