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I build fast, accessible, conversion-optimized Shopify themes — clean Liquid architecture, native API integrations, zero unnecessary app dependencies. ──────────────── WHAT I COVER ──────────────── ⚡ Liquid, JavaScript & Shopify APIs 🚀 Performance, SEO & Accessibility 🧩 App Extensions & Shopify Functions 🔌 App Integration & Store Health 📈 CRO Implementation ──────────────── ⚡ Liquid, JavaScript & Shopify APIs Custom theme code built on Shopify's native APIs — no bloat, no unnecessary apps. Custom Liquid · Metafields & metaobjects · AJAX API · Section Rendering API · Recommendations API · Storefront API · Vanilla JS · Modern CSS I write semantic, maintainable Liquid that integrates directly with Shopify's native APIs. Metafields and metaobjects replace app-dependent data layers. The AJAX and Section Rendering APIs power dynamic UX without full-page reloads. The Storefront API enables headless and hybrid builds. All JavaScript is vanilla — no jQuery, no framework overhead. OS 2.0 architecture · JSON templates · Dynamic sections · Theme blocks · Headless Shopify · Hybrid storefront · Liquid filters · Global sections ──────────────── 🚀 Performance, SEO & Accessibility Speed, structure, and inclusivity built into the theme — each one reinforcing the others. Core Web Vitals · LCP / INP / CLS · Lazy loading · Render-blocking audit · Structured data · Canonical tags · WCAG accessibility · ARIA markup Core Web Vitals directly affect search ranking and conversion. I audit and resolve LCP bottlenecks (image sizing, preloading, critical CSS), INP issues (event handler debouncing, task splitting), and CLS problems (reserved space, font swap). Structured data (JSON-LD) for products, breadcrumbs, and FAQs improves rich snippet eligibility. WCAG 2.1 AA compliance and ARIA markup ensure the store works for every customer and passes automated accessibility audits. JSON-LD schema · Open Graph · Rich snippets · Font optimization · Critical CSS · Image compression · Semantic HTML · PageSpeed 90+ ────────────────── 🧩 App Extensions & Shopify Functions Extending checkout and post-purchase surfaces without touching core platform code. Checkout UI extensions · Shopify Functions · Post-purchase extensions · WebAssembly · PCI-compliant sandbox · Custom discount logic · One-click upsell Checkout UI extensions replace legacy checkout.liquid for Shopify Plus stores — adding upsells, custom fields, and trust badges inside a PCI-compliant sandbox. Shopify Functions allow custom discount logic, shipping rules, and payment filtering at the platform level. Post-purchase extensions capture upsell revenue after payment without re-entering checkout flow. Checkout branding API · Delivery customization · Payment customization · Order routing logic · Discount stacking · Bundle discounts ───────────────── 🔌 App Integration & Store Health Evaluating, installing, and managing App Store apps cleanly inside a live store. App evaluation · Permission scope review · Theme blocks & app embeds · Script tag audit · Conflict resolution · Clean uninstall Not every problem needs a custom build — but every app needs proper evaluation. I review permission scopes, script tag injection, and theme block conflicts before installation. When apps are removed, I audit and clean residual code, Liquid snippets, and asset files to prevent performance degradation. I resolve conflicts between competing apps and establish clean embed patterns that keep the theme editor predictable. Residual code cleanup · App vs custom build analysis · Third-party script management · Tag manager integration · App performance impact audit ───────────────── 📈 CRO Implementation Converting briefs into theme code across product, cart, and checkout — built to test and measure. Sticky ATC · Quick-view drawers · Cart drawer · Free shipping bar · In-cart upsell · Figma-to-Liquid · Feature flags · A/B test structure CRO work lives or dies by implementation quality. Sticky ATCs, quick-view drawers, and cart drawers are built with Section Rendering API and AJAX — no page reloads, no layout shift. Free shipping bars and in-cart upsells pull live cart data. Figma-to-Liquid translation preserves pixel-accurate design intent while maintaining theme editor flexibility. Feature flags allow new components to ship to a percentage of traffic for A/B testing before full rollout. Split testing · Conversion tracking · GTM integration · Heatmap-ready markup · Bundle builder UI · Exit intent · Product recommendations · Upsell flows ───────────────── Shopify Development | Liquid (Programming Language) | Shopify Theme Development | Shopify Plus | Conversion Rate Optimization (CRO) | Web Performance | Shopify App Integration | JavaScript | API Integration | Web Accessibility (WCAG) | Front-End Development | Technical SEO | E-commerce Development | UI/UX Implementation | Core Web Vitals

With hands-on experience in Shopify development and a strong background in design and UX, I help businesses build fast, clean, and conversion-focused eCommerce stores. I specialize in creating Shopify solutions that are simple to use, easy to scale, and optimized to turn visitors into customers. I offer end-to-end Shopify services focused on performance, usability, and sales growth. Here’s what I bring to the table: Shopify Store Setup & Theme Customization Customizing Shopify themes to match the brand while keeping the store clean, modern, and conversion-focused. UX/UI Optimization for eCommerce Design-driven decisions based on user behavior to improve navigation, product discovery, and checkout flow. Product & Collection Structure Clear and logical organization that helps customers find products faster and improves overall store usability. Conversion-Focused Improvements Optimizing layouts, calls-to-action, and user flow to reduce friction and increase sales potential. Site Speed & Performance Optimization Ensuring fast load times and smooth performance across all devices, with a mobile-first approach. SEO-Friendly Shopify Structure Implementing clean page structures and best practices to support better visibility and indexing. I don’t just build Shopify stores — I focus on creating functional, performance-optimized shopping experiences that support real business goals. By combining technical Shopify skills with a strong understanding of UX and buyer behavior, I help brands build stores that look professional and are built to sell. If you’re looking for a reliable Shopify developer who understands both design and performance, let’s talk about how I can help improve your store and grow your online business.

Hi there! 👋 At the beginning of my career, I was focused on programming languages, syntax and software development best practices. I really felt like I’m in the zone while solving complex logical problems. My first project got me interested in ecommerce and Shopify and since then I’ve spent years building custom Shopify themes and functionalities for many brands. As my development skills grew, I naturally started paying more attention to performance. I got interested in site speed, Core Web Vitals and everything that can make a store faster and easier to use. Later, while working with 7 and 8 figure brands, I realized that building a great store is only part of the job. The next question became: why do customers actually buy and what prevents them from buying? That led me into analytics, user behavior, customer psychology and A/B testing. Today my focus is on three areas: -Custom Shopify development -Performance optimization -Experimentation and CRO I help brands build great Shopify stores. Once the foundation is in place, I focus on understanding users, identifying opportunities and helping teams validate ideas through experimentation. My goal is not only to build features, but to understand whether those features create value for the business. 💬 Client testimonial: "Milos is truly outstanding at what he does. He is highly knowledgeable, an excellent communicator, and has exceptional interpersonal skills. Throughout the entire process, he was fully transparent with timelines and consistently shared his progress, which is something you rarely get and should not be taken for granted."

I've been building web apps since 2011. I'm on Shopify since 2014 - custom themes, embedded apps, Shopify Plus stores, and everything in between. With 10+ years of hands-on experience and a track record of leading long-term, high-value projects, I bring both deep technical expertise and the reliability that comes with senior-level ownership. My core focus is Shopify in its full depth. Shopify Development: Liquid · Storefront & Admin API (REST + GraphQL) · App Bridge · Polaris · Theme Extensions · Checkout Extensibility · Metafields & Metaobjects · Section Rendering API · Markets & Geo-IP · Shopify CLI / GitHub workflow · OS 2.0 · Dawn · Hydrogen (Headless) App & Backend Development: Embedded Shopify apps · Node.js / Fastify · PHP / Symfony · Python / Flask · REST APIs · Webhooks · MySQL · PostgreSQL Frontend & Performance: JavaScript (ES6+) · React · HTML5/CSS3 · Figma-to-Liquid · Core Web Vitals · LCP/CLS optimization · Three.js · Canvas API · Swiper.js · etc Beyond code, I understand what merchants actually need - fast load times, clean architecture, maintainable codebases and solutions that scale. I've worked across DTC and B2B stores, handling everything from greenfield theme builds to complex app integrations, performance overhauls, migration from WooCommerce, BigCommerce, Magento, and other platforms, and long-term maintenance. I'm available for full-time or part-time remote engagements. If you're looking for a senior developer who can own the technical side of your Shopify store or product - let's talk.

🚀 Shopify & React Lead Developer — performance-first builds that convert Since 2016 I have delivered 200+ Shopify stores and custom apps that load in under 1.5 s LCP and raise sales by up to 25 percent. Top Rated Plus with a perfect Job Success score and 1 800+ Upwork hours. 💡 WHAT I DO * Headless Hydrogen storefronts (Remix, Next.js) * Custom Liquid themes from Figma or from scratch * Shopify Functions, B2B and subscription flows * Core Web Vitals tuning (LCP, CLS, TBT) * Integrations: Klaviyo, Recharge, Supabase, Algolia, Sanity * React Native mobile apps connected to Shopify * CRO and A/B testing with GA4, GTM, Hotjar 📈 RECENT WINS * Luxury jewellery store — LCP 4.2 s → 1.3 s, mobile conversion rate +18 percent * DTC cosmetics brand — Magento → Shopify Plus in 6 weeks, AOV +22 percent * SaaS merch shop — Hydrogen build, worldwide TTFB under 150 ms 🤝 WHY CLIENTS RETURN * Speed: short sprints, daily updates, transparent Trello or Jira boards * Clarity: Loom demos and documented pull requests—no surprises * Ownership: treat every store like my own P\&L * EU base: convenient overlap with US and APAC time zones 🔧 TECH STACK Shopify (Liquid, Hydrogen, Functions), React, Next.js, Remix, TypeScript, Node, GraphQL, Tailwind, GitHub Actions, AWS, Vercel, Cloudflare Ready to talk? Send an invite or message me with your goals—I’ll help you reach them.

Most Shopify stores don't have a traffic problem. They have a buying-experience problem. You're paying for clicks, but visitors land, hesitate, and leave. The product's good. The traffic's fine. The store just isn't making the case fast enough to turn that visitor into a buyer. That's the gap I close. I'm Milan. Over the last 7 years, I've built and optimized 250+ Shopify stores, from first-time startups to 8-figure brands, and the common thread is conversion. Cleaner buying experiences, sharper product pages, landing pages that actually match the ad and move people to checkout. On one redesign that meant taking a store's conversion rate up 420%. On others it's been steadier lifts in AOV, add-to-cart, and revenue per visitor. The number depends on where you're starting. The direction doesn't. 🎯 How I think about your store I don't redesign for "fresh." I work through four layers, on every page that matters: 1) Clarity — does a visitor instantly get the product, the value, and the next step? 2) Desire — does the page make them actually want it, not just see it? 3) Trust — are the doubts handled before they become a closed tab? Reviews, guarantees, shipping, proof. 4) Flow — is buying effortless, especially on mobile? Most stores leak in one or two of these. Find the leak, fix the leak, and the same traffic starts converting better. That's the whole game. 🛠️ What I can help with → Build — new Shopify stores and full redesigns, premium theme or fully custom, built around the buying journey from day one → Improve — CRO audits and priority fixes, PDP and landing page rebuilds, mobile and cart-flow optimization for live stores → Grow — ongoing CRO and Shopify execution for brands that want the store to keep improving, not get redesigned once and left alone I work in Shopify and Shopify Plus, design in Figma, build pages in Replo and GemPages, and handle the dev myself, so strategy, design, and implementation stay in one set of hands instead of scattered across freelancers. 📈 A few things I can back up → 250+ Shopify stores built and optimized → Conversion lifts up to 400%+ on full redesigns → Work across startups through 8-figure DTC brands → Real revenue impact, not just better-looking stores 💬 If this sounds like you, let's talk: → You've got traffic but conversion isn't where it should be → Your brand has outgrown the store selling it → You're spending on ads and want the landing page to finally keep up → You want one person who handles strategy, design, and Shopify build together Send me a message with where your store's at and what's frustrating you. I'll tell you straight what I'd focus on first. — Milan