Custom Shopify stores,
apps and integrations
by Filip Rastovic
10 years of Shopify experience. 120+ international clients. I build fast, conversion-focused stores and custom Shopify apps, from storefronts to headless builds, and I'm available to work on yours.
Trusted by category-defining brands
Full-stack Shopify expertise
From pixel-perfect themes to enterprise-grade headless architectures, I cover every layer of the Shopify ecosystem.
Custom Theme Development
Hand-coded Liquid themes built from scratch or tailored from Dawn. Every component optimised for speed, accessibility, and conversion.
Headless Commerce
Blazing-fast storefronts powered by Hydrogen + Remix or Next.js with the Storefront API. Sub-second load times, unlimited flexibility.
CRO & Speed Optimization
Data-driven audits, A/B testing, Core Web Vitals optimisation, and checkout UX refinement to squeeze every percentage point of conversion.
App & Integration Development
Custom Shopify apps, public or private. Deep integrations with ERPs, 3PLs, CRMs, subscriptions, reviews, loyalty and more.
Shopify Plus Migration
Seamless platform migrations with zero data loss. I move SKUs, customer records, orders, and content - keeping your SEO equity intact.
Growth Retainer
Ongoing partnership with monthly sprints, priority support, analytics reviews, and proactive improvements to compound your store's growth.
From brief to launch in weeks, not months
A battle-tested process refined across 140+ Shopify projects, built for speed without sacrificing quality.
Discovery & Audit
I dig into your analytics, competitors, and customer data to identify the highest-impact opportunities before writing a line of code.
Design & Architecture
High-fidelity Figma designs and a technical spec that both your team and mine align on before any development begins.
Build & Iterate
Agile two-week sprints with staging previews and regular check-ins. You see real progress, not just status updates.
Launch & Grow
Meticulous QA, zero-downtime deployment, and post-launch monitoring. Then I keep iterating on the data that comes in.
Results that speak louder
Real numbers from real brands. No fluff, no vanity metrics.
Ergolex
German home goods brand with a polished Figma mockup that needed building. I implemented it pixel-perfect in Shopify via Instant.so, then integrated cart upsell and cross-sell apps to lift average order value.
Visio Pro
German binoculars brand with an underperforming default Shopify product page. I replaced it with a custom-built Liquid page designed to convert both paid and organic traffic.
LastObject
Sustainable DTC brand needing eCommerce landing pages that actually sell. Custom-designed and optimised pages lifted conversions by over 20% and delivered a seamless shopping experience.
Tipalti
Fintech leader in AP automation with lead gen pages that weren't converting. A strategic redesign of page structure and messaging doubled their conversion rate and streamlined lead acquisition.
What clients say
Don't take my word for it. Hear directly from the brands I've worked with.
"Filip has a unique combo of skills: design & development. He proactively suggested new ideas on how to make the website not just functional but aesthetic. He created awesome visual mocks, iterated quickly based on my input and then coded all of it into a superb website. Throughout the process he was a charm to work with. All in all great designer-developer with an outstanding sense for client service."
"Filip was AMAZING! I would definitely hire him again and again. If you have the opportunity to work with Filip, you should absolutely do it - he will make you proud!"
"He understands what needs to be done and does it in a very quick and efficient way. For my next projects I would work with Filip again. Thank you!"
"I enjoyed working with Filip on these landing pages. He created very nice conversion-centred designs and was very knowledgeable about the platform. I was very happy with the outcome."
"Filip understood the project, understood my needs and made it happen. Created a really beautiful landing page that is going to work well with my ad campaign."
"Working with Filip is just GREAT! Everything is easy and simple. We will be booking him again very soon!"
"Filip delivered twice the expected results at half the price. If you are thinking of having a landing page designed, you can't go wrong with them. You won't be disappointed."
10 five-star reviews.
Every single one.
Taken directly from my Upwork profile - unedited, unfiltered. See the full profile →
Built on the best tools
I work with the modern Shopify stack so your store is fast, maintainable, and ready to scale.
Transparent, project-based pricing
No retainer lock-in until you're ready. Every project starts with a free strategy call so I scope exactly what you need.
A clean, fast ecommerce store built on a premium Shopify template. Perfect for new brands or those wanting to launch quickly without sacrificing quality.
- 3-page template-based Shopify store
- Premium theme setup & customisation
- Product, collection & homepage
- Basic app integrations (2–3)
- Mobile-optimised out of the box
- 1-week QA & launch support
- Custom design from scratch
- Custom app development
A fully custom Shopify store or high-converting landing page - designed and built from scratch around your brand and conversion goals.
- Custom design in Figma included
- Custom Shopify theme from scratch
- Unlimited sections & templates
- CRO-focused layout & copy structure
- Complex app integrations
- Speed & Core Web Vitals optimisation
- 1-month post-launch support
- Headless / Hydrogen build
Complex Shopify Plus architecture, headless builds, or large-scale migrations. For brands with serious technical requirements.
- Shopify Plus custom build
- Hydrogen or Next.js headless option
- Multi-region / multi-currency
- Custom Storefront API integration
- ERP / CRM / 3PL integrations
- Full CRO audit + A/B test roadmap
- 3-month post-launch retainer
- Ongoing growth partnership
Let's talk about your store
Book a 60-minute strategy call. I'll review your current store, identify the biggest growth opportunities, and map out a clear path forward - no obligation, no sales pitch.
Schedule a meetingCommon questions
Everything you need to know before kicking off a project with me.
Ready to grow your store?
Book a free 60-minute audit. We'll review your store, identify the biggest revenue leaks, and give you an actionable roadmap - no strings attached.
