The choice of a Shopify agency determines the speed to market, commercial performance, and total cost of ownership. In 2025, the right partners master three key areas: creation, migration, and growth. This guide offers concrete criteria, a short process, and technical audit points to select a team capable of increasing your revenue without unnecessary technical debt. It highlights the approach of Stellar Projects, positioned on Shopify e-commerce expertise.
Decide based on evidence: comparable cases, KPIs at 90 days and 12 months, technical debt, and 36-month TCO.
Align your needs on 3 aspects: creation, migration, optimization.
Require a quantified SEO and performance plan before signing.
Shortlist 3 agencies, conduct a paid POC, sign by milestones.
Why Shopify in 2025
Shopify combines a robust core (Online Store 2.0, Checkout Extensibility, Markets, POS) and an ecosystem of apps and APIs that cover most DTC and B2B needs. The trade-offs are less about “can we do it” and more about “how to do it cleanly, quickly, and measurably.” The main risk is not the platform but the stacking of apps, lack of governance, and SEO loss during a redesign.
3 typical needs: creation, migration, growth
Shopify store creation
Objective: rapid launch of a performant and extensible store. Expected deliverables: OS 2.0 design, content, PLP/PDP templates, promo modules, analytics, tax and shipping setup, basic CRM/ERP integrations, accessibility and quantified performance. Evaluate the agency on its ability to deliver a clean, documented foundation ready for iteration.
Migration to Shopify
Objective: retain traffic and customer value while simplifying operations. Deliverables: URL mapping, 301 redirects, product/customer/order data migration, SEO recovery (schemas, metadata), payment method alignment, ad accounts and pixels migration, recrawl and Search Console monitoring plan. The best migrations show an organic recovery curve under 8 weeks.
Shopify growth and optimization
Objective: improve conversion, AOV, retention, and margin. Method: CRO backlog, A/B testing, performance optimization, app consolidation, merchandising, international (Markets), B2B, retail media, personalization, CRM automations. Measure each sprint by verifiable increments.
Agency selection criteria
- Comparable cases: same baskets, same category, same countries. Request figures at D+90 and D+365.
- Technical quality: OS 2.0 theme architecture, controlled app debt, Git, QA, testing, documentation.
- SEO and data: migration plan, schemas, e-commerce tagging plan, consent mode, and GA4 governance.
- Integrations: ERP/PIM/WMS/OMS/CRM. Favor official APIs and webhooks.
- Governance: dedicated project manager, rituals, SLA, risk management, and reversibility plan.
- Cost transparency: detailed quote, assumptions, third-party costs, 36-month TCO.
6-step selection process
- Diagnosis: objectives, IT constraints, languages/countries, taxes, logistics, current debt.
- Long-list: 6–8 relevant agencies per vertical.
- RFP: standardized brief with target KPIs, integrations, volumes, content examples.
- Short-list: 3 agencies, Q&A workshop and mini-audit of your stack.
- Paid POC: PDP prototype, SEO migration plan or integration mapping delivered within 10 days.
- Milestone contract: acceptance criteria, performance budgets, post-go-live commitments.
Technical and SEO audit to require
- Theme: sections, reusable snippets, i18n, accessibility, performance (LCP/INP/CLS).
- Apps: necessity, cost, speed impact, native alternatives, clean uninstall plan.
- Checkout: extensibility, payment methods, upsell/cross-sell, measured latency.
- SEO: URL structure, redirects, schemas, internal linking, variant and filter management.
- Data: tagging plan, event nomenclature, acceptance tests, privacy.
- Security: secret management, restricted access, backups, incident tracking.
Budget and TCO: compare on equal scope
Evaluate over 36 months: initial build (scoping, UX/UI, dev, integrations, QA, SEO), run and evolutions (CRO, content, SEO, performance), third-party costs (theme, apps, data tools, monitoring). Define performance and SEO budgets from the quote stage. Require explicit assumptions and priced optional items.
Why consider Stellar Projects
Stellar Projects highlights three clear offers: Shopify store creation, migration to Shopify, and growth/optimization. The team combines e-commerce design, IT integrations, and operational rigor. Notable points: measurable KPI-driven approach, contained app debts via native choices when relevant, formalized SEO migration plan, and post-launch management with CRO backlog. For brands wanting a fast, clean, and scalable store, this positioning reduces time-to-value and operating costs.
FAQ
Shopify agency or freelancer?
An agency offers governance, continuity, QA, and complex integrations. A freelancer suits targeted evolutions. Decide based on risks, deadlines, and TCO.
How much does a Shopify redesign cost?
From a few tens to several hundred thousand euros depending on design, country, B2B, integrations, and SEO. Compare offers over 36 months, not just the initial quote.
How to secure a migration to Shopify?
URL mapping, 301 redirects, data recovery, schemas, recrawl plan, Search Console monitoring, load and checkout testing.
Should you go headless?
Only if clear objectives require it: custom multi-front experience, need for extreme speed, advanced personalization. Otherwise, an optimized OS 2.0 theme is sufficient.
Which KPIs to track after launch?
LCP/INP/CLS, conversion, AOV, retention, email share, non-branded SEO traffic, run stability, and backlog velocity.