Shopify Developer

Reliable Shopify development for agencies

I help teams build and improve Shopify stores. This includes theme development, custom features, migrations, integrations, and ongoing technical support.

Matthias Gayaud, freelance Shopify developer
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Services

From one-off builds to ongoing technical support.

🎨

Theme Development and Integration

Building and customizing Shopify themes that match the brand and keep the store fast and easy to maintain.

🚀

Custom Shopify Development

Developing store functionality such as product logic, advanced filters, automations, and custom storefront behavior.

🔄

Platform Migrations

Moving stores to Shopify from platforms like PrestaShop or WooCommerce while keeping data, SEO rankings, and uptime intact.

📱

App Development

Building custom Shopify apps when existing apps cannot solve the problem or when deeper integration is needed.

🛠️

Maintenance and Support

Bug fixes, performance improvements, and ongoing technical support for agencies.

💼

Technical Consulting

Advice on Shopify architecture, integrations, performance, and choosing the right technical approach for a project.

Recent Work

Projects delivered for agencies and brands.

Theme CustomizationCustom Checkout LogicAnimated Landing Pages

Louis XIII

Louis XIII
Theme CustomizationCustom FeaturesOngoing Improvements

French Bloom

French Bloom
Theme CustomizationStore FunctionalityOngoing Support

Bliss

Bliss
Private Sale WebsiteCustom FeaturesOngoing Support

Rémy Cointreau

Rémy Cointreau
Custom Loyalty FeaturesInvoice AutomationTheme Improvements

Sweet Pepper

Sweet Pepper
Theme CustomizationProduct PresentationPurchasing Flows

Filon

Filon

Testimonials

What clients and partners say about working together.

"I gave Matthias several technical tasks and he delivered on every one. From a custom loyalty program to automated PDF invoices and bug fixes, he improved the experience on my site. He is professional, responsive, and I would happily work with him again."

Julie Le Carrour
Founder, Sweet Pepper

"I have worked with Matthias on several Shopify projects and the experience has always been excellent. He understands both the technical side and the business side of e-commerce, and he consistently proposes solid solutions."

Sacha Levy
Shopify Consultant and Developer

"Matthias helped improve the technical structure of my store, optimized SEO, and handled several integrations. Professional, responsive, and easy to work with."

Murielle Hamon
Founder, La Mue Créations

How I Work

A simple process from first conversation to delivery.

01

Discovery and Analysis

We discuss the goals of the project and any constraints. I review the current setup and outline the technical approach and timeline.

02

Proposal and Planning

You receive a detailed proposal with a clear scope of work and realistic timeline. Once approved, development begins.

03

Build and Iterate

I build following Shopify best practices. You receive updates along the way and can request adjustments if needed.

04

Delivery and Support

Testing and deployment are handled carefully. I can also walk your team or your client through what was built and remain available for future improvements.

About Me

I am a Shopify developer with a background in software engineering. For the past few years I have focused entirely on Shopify development. I work with agencies and brands on theme builds, custom features, and technical improvements.

Many of my projects involve collaborating with agencies as their Shopify development partner. I try to keep communication clear so projects move forward smoothly.

Ready to talk about your next project?