Stellar Projects is a Paris-based e-commerce agency specializing in Shopify that designs, redesigns and grows profitable online stores. Since 2018, we have delivered more than 100 stores for DTC brands, century-old houses and B2B companies, generating €58M in cumulative revenue, with an average rating of 4.9/5 in signed testimonials.
Looking for an e-commerce partner that can take your project from end to end, from building the site to growing it? This page covers our services, our measured results, our 5-step process and the budgets to expect. And if you want to get straight to the point: request your quote, with a reply within 48 hours.
Contents
Our e-commerce agency services
An e-commerce agency handles everything that makes an online store sell: site design, technology, acquisition and retention. At Stellar, this offering is organized into four services, each with specific deliverables.
- Shopify store creation. You are launching a brand: we design your e-commerce site as a store built to sell from day one. Deliverables: conversion-focused UX, design true to your identity, custom Liquid development, catalog and product page structure, payment, shipping and tax setup, built-in technical SEO and full multi-device acceptance testing.
- Redesign and migration to Shopify. Your current site has hit a ceiling or your CMS is holding you back: we redesign it or migrate you from PrestaShop, Magento, WooCommerce or Wix with no data loss and no SEO drop. Deliverables: transfer of your catalog, customers and order history, 301 redirect plan, Search Console revalidation, post-migration training. Full details are on our website redesign and migration to Shopify pages.
- Growth and optimization. Your store is live but underperforming: we audit, prioritize and execute. Deliverables: CRO audit and checkout funnel optimization, technical and semantic Shopify SEO, email marketing and automation with our Klaviyo expertise, international expansion.
- Custom AI tools. Our AI Studio connects your tools (Shopify, ERP, CRM, PIM), automates the tedious work (ALT tags, redirects, catalog enrichment) and builds the business tools you won't find on the App Store.
These four services are built around a single framework: the STELLAR Method, our working grid for building consistent, resilient e-commerce brands, from the brand system to AI-powered amplification.
Measured results, not promises
An e-commerce agency's best argument is still its clients' numbers. Two recent examples, measured on our projects:
- Cabania, a cabin bed brand (launched 2023). Store built from scratch on a Shopify, Klaviyo and Stripe stack: +200% in sales by the second year, with an average order value of €480.
- Le Minor, a century-old Breton house (migration 2024). Migration to Shopify and a redesigned shopping experience: +50% conversion rate for this maker of seafaring clothing produced in Brittany.
"We saw Stellar as a true outsourced digital team. Able to support us as genuine Shopify experts, but also to challenge us on features, on design and on technical solutions."
Quentin Douce, Co-founder
You will find more signed reviews, with names and job titles, on our client testimonials page: this commitment to proof is what drives our average rating of 4.9/5.
E-commerce agency, web agency or Shopify agency?
These three terms partly overlap, but they don't describe the same job. A web agency builds websites, an e-commerce agency builds sales machines, and a Shopify agency does it on a platform it knows inside out. The table below sums up what changes for you:
| Criterion | General web agency | E-commerce agency | E-commerce agency specializing in Shopify |
|---|---|---|---|
| Main goal | Online presence, brand image | Sales and profitability | Sales and profitability on Shopify |
| Key skills | Design, development | UX, CRO, acquisition, logistics, data | The same, plus Liquid, apps and the Shopify ecosystem |
| KPIs tracked | Traffic, aesthetics | Conversion, average order value, LTV | Conversion, average order value, LTV, checkout performance |
| Right for you if | Brochure site, content | Store on any CMS | Shopify store: creation, redesign or migration |
In other words: if your store runs (or will run) on Shopify, a specialized e-commerce agency saves you from paying for a generalist's learning curve. That is Stellar's positioning, as a Shopify agency and Shopify Plus Partner. If you haven't chosen your CMS yet, our comparison of e-commerce platforms will help you make an informed decision.
Our 5-step process
A successful e-commerce project follows a clear path, with milestones and deliverables at every stage. Here is how we work:
- Scoping. A workshop to define your goals, your personas and your existing setup (data, tools, constraints). It is free and with no commitment: 30 minutes with a Shopify expert, not a salesperson.
- Proposal. A detailed roadmap within 48 hours of scoping: scope, deliverables, timeline, budget and success metrics. No vague line items.
- Design and development. UX/UI design, catalog structure, Liquid development, integrations (ERP, CRM, Klaviyo, logistics) and technical SEO, in short cycles with weekly check-ins.
- Acceptance testing and launch. Functional, performance and security testing, test orders, a redirect plan in the case of a migration, then the switchover during a quiet period.
- Ongoing growth. Training for your teams, performance tracking, CRO and SEO optimization, email campaigns: going live is a starting point, not the end of the project.
To save time on scoping, we have prepared a Shopify specifications template to fill in: about thirty guided questions on your brand, your catalog, your integrations and your goals. Complete it before our first conversation and you will receive a structured quote within 48 hours, with no unnecessary meetings.
Indicative pricing: what to expect
An e-commerce agency's budget depends on the scope, the design ambition and the integrations. To give you an honest order of magnitude, here are the ranges we see on our projects and on the French market:
| Service | Indicative range | Average timeline |
|---|---|---|
| Visual redesign (design and theme) | €2,500 to €10,000 | 4 to 8 weeks |
| Full creation or redesign | €10,000 to €30,000 | 2 to 5 months |
| Custom or Shopify Plus project | €30,000 and up | 3 to 9 months |
| Growth support (CRO, SEO, email) | On quote, monthly commitment | Ongoing |
These amounts exclude the Shopify subscription and third-party apps. To understand what drives the bill item by item, read: how much a Shopify agency costs.
Why entrust your e-commerce to Stellar?
Because you are looking for a partner, not just another vendor. In practical terms, here is what sets us apart from other e-commerce agencies:
- Shopify specialization. As a Shopify Plus Partner, we don't spread our expertise across ten CMSs: we know the platform, its apps and its limits better than anyone.
- Proof over slides. 100+ stores delivered since 2018, €58M generated for our clients, 4.9/5 in signed testimonials: our results are public and verifiable.
- A method. The STELLAR Method structures every engagement, from brand consistency to AI-powered amplification, so your store goes the distance.
- A Paris-based team that is there for you. A single point of contact, weekly check-ins, replies within 24 hours. If you are looking for an agency in Paris that picks up the phone, that's us.
Still weighing several partners? We have written a transparent guide to choosing the right Shopify agency, even if it isn't us. And when you are ready, book your free discovery call: 30 minutes, a diagnosis and a quote within 48 hours.