Stellar Projects is a Shopify-specialized e-commerce agency based in Paris that designs, redesigns, and grows profitable online stores. Since 2018, we have delivered over 100 stores for DTC brands, century-old houses, and B2B players, generating €58M in cumulative revenue, with an average rating of 4.9/5 in signed testimonials.
Are you looking for an e-commerce provider capable of handling your project from end to end, from site creation to growth? This page presents our services, measured results, our 5-step process, and the budgets to expect. And if you want to get straight to the point: request your quote, response within 48 hours.
Summary
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 precise deliverables.
- Shopify store creation. You're launching a brand: we design your e-commerce site as a store built to sell from day one. Deliverables: conversion-oriented UX, design true to your identity, custom Liquid development, catalog and product page structuring, payment, shipping, and tax configuration, integrated technical SEO, and complete multi-device testing.
- Redesign and migration to Shopify. Your current site is stagnating or your CMS is holding you back: we redesign or migrate from PrestaShop, Magento, WooCommerce, or Wix without data loss or SEO drop. Deliverables: catalog, customer, and order history recovery, 301 redirect plan, Search Console revalidation, post-migration training. Details are on our site redesign and Shopify migration pages.
- Growth and optimization. Your store is online but underperforming: we audit, prioritize, and execute. Deliverables: CRO audit and purchase funnel optimization, technical and semantic Shopify SEO, email marketing and automation with our Klaviyo expertise, internationalization.
- Custom AI tools. Our AI Studio connects your tools (Shopify, ERP, CRM, PIM), automates tedious tasks (ALT tags, redirects, catalog enrichment), and builds business tools that don't exist on the App Store.
These four services revolve around a single framework: the STELLAR Method, our working grid for building coherent and resilient e-commerce brands, from brand system to AI amplification.
Measured results, not promises
The best argument for an e-commerce agency remains its clients' numbers. Two recent examples, measured on our projects:
- Cabania, cabin bed brand (created 2023). Store created from scratch on the Shopify, Klaviyo, and Stripe stack: +200% sales in the second year, average cart value of €480.
- Le Minor, century-old Breton house (migration 2024). Migration to Shopify and redesign of the shopping experience: +50% conversion rate for this brand of marine clothing made in Brittany.
« We saw the Stellar agency as a true outsourced digital team. Capable of supporting us as real Shopify experts but also challenging us on features, design, and technical solutions. »
Quentin Douce, Co-founder
You will find other signed testimonials, with names and positions, on our customer testimonials page: this demand for evidence underpins our average rating of 4.9/5.
E-commerce agency, web agency or Shopify agency?
These three terms partially overlap, but they don't describe the same profession. A web agency builds websites, an e-commerce agency builds selling machines, and a Shopify agency does so on a platform it deeply masters. The following table summarizes what changes for you:
| Criterion | Generalist web agency | E-commerce agency | Shopify-specialized e-commerce agency |
|---|---|---|---|
| Main objective | Online presence, image | Sales and profitability | Sales and profitability on Shopify |
| Key skills | Design, development | UX, CRO, acquisition, logistics, data | Same, plus Liquid, apps, and Shopify ecosystem |
| KPIs tracked | Traffic, aesthetics | Conversion, average cart, LTV | Conversion, average cart, LTV, checkout performance |
| Relevant for you if | Showcase 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 the learning curve of a generalist. This is Stellar's positioning, a Shopify agency and Shopify Plus partner. If you haven't chosen your CMS yet, our comparison of e-commerce platforms will help you decide with full knowledge of the facts.
Our 5-step process
A successful e-commerce project follows a clear progression, with milestones and deliverables at each stage. Here's how we work:
- Framing. A workshop to define your objectives, personas, and existing assets (data, tools, constraints). It's free and without obligation: 30 minutes with a Shopify expert, not a salesperson.
- Proposal. A detailed roadmap within 48 hours after framing: scope, deliverables, timeline, budget, and success indicators. No vague lines.
- Design and development. UX/UI design, catalog structuring, Liquid development, integrations (ERP, CRM, Klaviyo, logistics), and technical SEO, in short cycles with weekly checkpoints.
- Testing and go-live. Functional, performance, and security tests, test orders, redirect plan if migrating, then switch during an off-peak period.
- Continuous growth. Training for your teams, performance monitoring, CRO and SEO optimizations, email campaigns: going live is a starting point, not the end of a project.
To save time on framing, we have prepared a Shopify specification template to fill out: about thirty guided questions about your brand, your catalog, your integrations, and your objectives. Fill it out before our first exchange and you will receive a structured quote within 48 hours, without unnecessary meetings.
Indicative pricing: what to expect
The budget for an e-commerce agency depends on the scope, design ambition, and integrations. To give you an honest order of magnitude, here are the ranges observed on our projects and on the French market:
| Service | Indicative range | Average lead time |
|---|---|---|
| Graphic redesign (design and theme) | €2,500 to €10,000 | 4 to 8 weeks |
| Creation or complete redesign | €10,000 to €30,000 | 2 to 5 months |
| Custom project or Shopify Plus | €30,000 and beyond | 3 to 9 months |
| Growth support (CRO, SEO, email) | By quote, monthly commitment | Ongoing |
These amounts do not include Shopify subscription and third-party applications. To understand what causes the bill to vary item by item, two resources complement this page: how much a Shopify site costs and how much a Shopify agency costs.
Why entrust your e-commerce to Stellar?
Because you are looking for a partner, not just another service provider. Specifically, here's what sets us apart from other e-commerce agencies:
- Shopify specialization. A Shopify Plus partner, we don't dilute our expertise across ten CMSs: we know the platform, its apps, and its limitations better than anyone.
- Proof rather than 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 each mission, from brand consistency to AI amplification, so your store stands the test of time.
- A team in Paris, available. Single point of contact, weekly check-ins, response within 24 hours. If you are looking for an agency in Paris that picks up the phone, that's us.
Still hesitating between several partners? We have written a transparent guide to choosing your Shopify agency well, even if it's not us. And when you're ready, book your free discovery call: 30 minutes, a diagnosis, a quote within 48 hours.