Shopify Developer
& CRO Specialist
I'm Stefan, a front-end & Shopify developer from Serbia. For 5+ years I've built custom Liquid themes, landing pages and advertorials for D2C brands in the US, EU and Australia.
This Is Stefan Maric
A dedicated front-end & Shopify developer focused on visually consistent, high-performing and conversion-focused e-commerce. I build custom themes in Liquid, HTML, CSS and JS, and ship fast pages with Replo, Instant and Webflow. Today I run my own studio, Koderium.
Stores That Convert
Landing pages, advertorials, product pages and full Shopify and Webflow builds for D2C brands across the US, EU and Australia.
Building Stores Beyond Visuals
From custom Shopify themes to campaign pages and clean tracking, I build storefronts made for speed, clarity and conversion.
Custom Shopify Themes
Pixel-accurate Figma-to-Liquid builds, custom sections and components your team can edit.
Figma To Liquid
Designs implemented accurately in Liquid, HTML, CSS and JavaScript, section by section.
Editable Sections
Custom sections and blocks your marketing team can update without touching code.
Landing Pages & Advertorials
Fast campaign pages in Replo, Instant, GemPages or code, built to be A/B tested.
Built For Testing
Page variants ready for A/B tests, so paid traffic lands on the version that converts.
Mobile-First
Most ad traffic is mobile, so every page is built and checked on phones first.
Speed & Tracking
Store performance fixes plus clean Meta Pixel, GA4 and Klaviyo setups you can trust.
Faster Storefronts
Leaner themes and fewer heavy apps for quicker loads and a smoother path to checkout.
Tracking You Can Trust
Meta Pixel, GA4 and Klaviyo set up consistently, so your marketing spend is measured right.
Where I've Worked
Five years across agencies, in-house D2C teams and freelance clients.
Download CVFounder · Koderium
Dec 2025 – PresentZrenjanin, Serbia
Shopify Developer · Happy Mammoth
Apr – Oct 2026Product pages, landing pages and advertorials for a multi-region D2C brand.
Co-Founder & Shopify Developer · heylander
May 2024 – Nov 2025Co-founded a landing page agency for D2C brands and built its client work: landing pages, advertorials, custom Liquid and analytics integrations for Seatopia, Mojo, Toty, Big Bold Health, Sassy Saints and more. See the projects →
Frontend Developer · wollson
Jun 2021 – Apr 2024Responsive interfaces across Shopify, Unbounce, Framer, Shogun and Replo. Belgrade.
Shopify Developer · Upwork
Jun 2021 – PresentFreelance builds on Shopify, WordPress, Replo, Framer and Unbounce.
Graphic Designer · BLDR Group
Nov 2019 – Feb 2022Branding, social and email design for real estate agents. Miami (remote).
Tools Behind My Workflow
The platforms, builders and tools I use to design, build, test and measure Shopify storefronts.
Shopify Plus
Store DevelopmentCustom Liquid themes, sections and storefront features for Shopify and Shopify Plus.
HTML · CSS · JS
Front-End CodeHand-written, responsive front-end code when a builder would slow the store down.
Replo · Instant · GemPages
Page BuildersFast landing pages and advertorials built for campaigns and A/B testing.
Webflow · Framer
Marketing SitesResponsive marketing pages and microsites outside the Shopify stack.
Figma
Design HandoffReading and implementing designs accurately, from layout grids to hover states.
GA4 · Meta Pixel · Klaviyo
Tracking & EmailAnalytics and marketing integrations set up consistently across the store.
Frequently Asked Questions
Answers to common questions about my workflow, Shopify development, timelines and how we can work together.
What do you work on?
Shopify and Shopify Plus stores: custom Liquid themes, product and landing pages, advertorials, speed fixes and tracking setups.
Which page builders do you use?
Replo, Instant, GemPages, Shogun, Webflow and Framer, or plain code when a builder would slow the store down.
Can you build from my Figma designs?
Yes. I implement Figma designs pixel-accurately and keep sections editable for your team.
How long does a project take?
A landing page usually takes a few days. A custom theme or larger rebuild takes a few weeks, depending on scope.
Do you work with clients outside Serbia?
Most of my clients are in the US, EU and Australia. I work remotely and invoice through my company, Koderium.
Can you fix a slow Shopify store?
Yes. I audit the theme and apps, remove what slows the store down and rebuild heavy sections in lean code.
Can you set up tracking for my ads?
Yes. I set up Meta Pixel, GA4 and Klaviyo so events fire consistently and your reports match your spend.
Let's Build Something That Converts
Have a store or campaign in mind? Tell me about it and I'll reply within 24 hours.
Ready To Grow
Your Store?
Custom Shopify themes, landing pages and clean tracking for D2C brands that want more from every visit.
Let's Work Together