Wizards Reply

About Wizards Reply

Wizards Reply is an engineering and product design collective based in Paris and part of the Reply group. Since 2018, our 70+ technicians, project managers and designers have built and run production-grade digital systems on open-source technologies for startups, agencies, large groups and multinationals.

Our experts come from large corporations, unicorns, open-source projects and startup CTO roles, and a third of them teach in leading Parisian schools. Every one of them volunteers for the projects they join.

We build custom, complex applications for any industry, from internal business tools and AI agents to headless websites and commerce platforms. Every one is built on open source as a modular, composable stack: each module does one job and can be extended, replaced or scaled on its own, and our clients own their code, their data and their roadmap, with no lock-in. In commerce, that means Medusa, a headless CMS such as Payload, and Next.js or TanStack Start.

We work as a dedicated squad, as an extension of your team or as your CTO as a service, from scoping through delivery to run. Trusted to deliver, without limits.

Medusa Cases

We use Medusa for brands whose commerce goes beyond a single checkout: several channels, configurable products and back-office flows that a standard platform cannot model.

Highlighted Case: Gaya Runs Every Channel on One Medusa Engine

Gaya designs electric cargo bikes for urban families in France and Belgium. Every bike is configured with kits and accessories, and it can be bought online, in the Paris showroom or through a reseller, rented, or serviced at the workshop. In December 2024 a team of five from Wizards Reply began replacing Gaya's Shopify store with Medusa, Payload and Next.js. The new platform went live on 16 September 2025 and took its first orders the same day.

Medusa now holds the catalog, pricing, cart, checkout and orders for every channel. We built payment provider modules for PayPlug, Alma, Younited and Greenleaze, plus a dedicated reseller checkout that has been live since January 2026. Showroom and workshop sales go through draft orders, and a bridge connects Medusa to the PayPal Zettle point of sale. Workflows and subscribers keep Payload, Airtable and Klaviyo in sync.

By switching to Medusa we really bought ourselves that long-term flexibility.

Lucie Brouhart

·

Head of Operations and Customer Experience at Gaya

Medusa Specializations

We shape Medusa around the way a brand sells. Custom modules and payment providers hold the business logic. Workflows and subscribers sync with CRM, logistics and point-of-sale tools, and custom API routes let those tools call back into Medusa. Admin extensions give operations teams the screens they need. Medusa stays the single source of truth for commerce data, and the CMS and storefront are built around it.

What We're Best At

• Composable stacks — Medusa for commerce, Payload for content and SEO, Next.js or TanStack Start for the front end.
• Every channel on one engine — webshop, store POS, workshop and B2B reseller checkout on one Medusa catalog.
• Configurable products — configurators managed in the CMS, priced and sold through Medusa.
• Custom integrations — payment providers, CRM, logistics and POS tools connected through Medusa modules, workflows and subscribers.
• Shopify to Medusa migrations — full replatforming, timed with product launches.
• Headless CMS — content platforms for multi-country, multi-brand organisations, with strong SEO and editorial governance.
• AI & automation — custom internal tools and AI agents that digitise business processes and take over repetitive tasks.
• Backend-for-Frontend — decoupled architectures that let each digital channel evolve on its own, faster and more securely.
• Long-term partnership — we stay on after launch, up to acting as our clients' CTO as a service.