How to Choose a Headless Shopify Agency (Europe, 2026)
· 7 min read
Choose a headless Shopify agency by checking comparable live projects, the proposed delivery team, code ownership and a concrete post-launch support plan. Before shortlisting partners, ask each to explain why a standard Shopify theme would not meet your requirements; if it would, do not commission a headless rebuild.
For a Head of Ecommerce or founder in the Nordics or Europe, the useful question is not which agency tops a list. It is which team can support your content, markets and operations without creating a system your business cannot maintain. Use this guide as a procurement checklist, not an agency ranking.
When you do not need headless
Keep a theme on the shortlist when your product pages, campaigns and editorial needs fit the existing store, and the team can operate it without recurring workarounds. A redesign, better content structure or a focused integration may address the actual problem without replacing the storefront.
Do not choose headless only because a proposal promises speed or a more modern stack. Ask the agency to identify a specific requirement, demonstrate the limitation in your current setup and compare a theme-based solution with a custom frontend. Include hosting, CMS, integrations, monitoring, content migration and ongoing development in both proposals, not just the launch fee.
Before proceeding, name an internal owner for content and a person responsible for technical decisions. If neither role is covered, resolve that gap before buying a more custom system.
Selection criteria: evidence before a shortlist
Ask every candidate for the same evidence. Compare a relevant project and the people who delivered it, rather than treating a partner badge or an attractive homepage as proof of fit.
Shopify and headless experience
Request a walkthrough of a live Shopify storefront with comparable complexity. Ask what the team built, which commerce functions remain in Shopify, how previews work and how releases are tested. If you are evaluating Shopify Plus, ask them to separate the plan decision from the architecture decision and explain the requirements behind each recommendation.
CMS and editorial experience
Ask for a demonstration of the editor workflow in Sanity or the proposed CMS: product content, translations, campaigns, previews and publishing. Invite the people who will actually maintain the content. Ask who owns the content model, how it changes and how existing content will be migrated. A good-looking storefront is not enough if everyday editing needs a developer.
Performance measured on real users
Request real-user performance evidence for a comparable store, with dates, device and market breakdowns, rather than only a lab score. Agree how Core Web Vitals and conversion will be monitored, what the baseline is and who investigates regressions. Do not accept a performance guarantee without understanding the measurement method and dependencies.
Multi-store, multi-market and B2B requirements
Map brands, markets, languages, currencies, catalogues and integrations before comparing proposals. Ask which content and code should be shared and which should remain independent. For B2B, walk through a real buyer journey: account access, pricing, availability, quoting, ordering and the handoff to internal systems. Request evidence for the requirements you actually have, not a generic list of capabilities.
Support, continuity and commercial model
Ask who handles incidents, dependency updates and small improvements after launch. Define support hours, escalation, availability during holidays, response expectations and what is excluded in the contract. Compare discovery, build and ongoing costs separately; ask how scope changes are approved. Name the people who will retain knowledge if a developer leaves.
Time zone, language and references
Agree working-hour overlap with your Nordic or European team, meeting language, documentation language and editorial training. Do not assume that a European office means the delivery team works in your time zone. Speak to references with similar operating needs and ask what happened after launch, including how issues were resolved.
Code ownership and an exit path
Confirm ownership of the repository, storefront code, CMS content and service accounts in writing. Ask about third-party licences separately. Require documentation, access control, deployment instructions and a handover plan so your team or another partner can operate the store. Ask to see an example of handover documentation before signing.
Compare delivery models
The table is a set of procurement trade-offs to investigate, not a price benchmark or a rating of providers. Actual cost, speed and continuity depend on the named team, scope and agreement.
| Model | Cost model | Speed | Depth | Continuity | Risk to check |
|---|---|---|---|---|---|
| In-house team | Salaries, hiring and tooling | Depends on existing capacity and recruitment | Validate Shopify, frontend and CMS coverage | Knowledge stays internally if documented | Hiring gaps and dependence on individual staff |
| Freelancer | Hourly, day rate or scoped project | Depends on one person's availability | Validate specialist skills and uncovered roles | Agree backup and handover arrangements | Single-person availability and support coverage |
| Specialist headless agency | Discovery and build scope, then agreed support | Validate the assigned team's capacity | Ask for comparable Shopify and CMS work | Check whether the build team stays involved | Stack bias, limited capacity and exit dependency |
| Large full-service agency or SI | Workstreams, project fees or retained capacity | Check staffing and approval dependencies | Validate the actual commerce specialists assigned | Agree knowledge transfer between teams | Handoffs, subcontracting and unclear responsibility |
Questions to ask an agency
Use this checklist in interviews and attach the answers to the proposal:
- Why is headless a better fit than improving our theme? What would make you recommend against it?
- Which comparable projects did the proposed team deliver, and can we speak to those clients?
- Can our editors try the proposed CMS workflow before we approve the content model?
- How will you measure real-user performance before and after launch, across devices and markets?
- How will brands, languages and markets share code and content without blocking local teams?
- Can you demonstrate our B2B buying and internal order-handling workflows?
- Who owns integrations, migration, redirect mapping, testing and launch decisions?
- Who supports the store after launch, in which hours and languages, and under what agreement?
- What costs sit outside the build fee, and how are changes approved?
- Who owns the code and accounts, and what would a handover to another team include?
Red flags
Pause when a proposal recommends headless before understanding your operations, promises rankings or conversion gains without evidence, or shows only lab scores with no measurement context. A refusal to discuss theme alternatives is a reason to investigate stack bias.
Other warning signs are unnamed delivery staff, case studies with no explanation of the agency’s contribution, no editor demonstration, unclear recurring costs and a launch plan without ongoing ownership. Unclear repository access or a contract that makes leaving impractical deserves legal and technical review before signing.
Where Skai fits — our perspective
Skai is a Norwegian team building custom Shopify storefronts with Sanity and Next.js, alongside operational tools and integrations. Our model starts with a project and continues as an ongoing development partnership, with real-user performance measurement and further improvements. This is our own service description, not an independent ranking.
For relevant evidence, read the TileCloud multi-brand Shopify and Sanity case study, the Kastel multi-market headless storefront case study and the Abate multi-store B2B portal case study. Use them to ask which parts of your requirements are comparable and which are not; past project results are not a forecast for your store.
Review our headless Shopify development agency services for the approach and ownership model. If those needs match yours, book a discussion about your storefront requirements. If a theme meets your needs, keep that option in the decision.
Frequently Asked Questions
How do I choose a headless commerce agency?
Choose the team that can demonstrate comparable work, explain the architecture trade-offs and commit to clear ownership and support responsibilities. Use the same brief and evidence checklist with every candidate so you can compare their answers.
Do we need a headless Shopify storefront?
You do not need headless if a theme meets your content and customer-experience requirements. Ask candidates to compare a theme-based option with a custom frontend before agreeing a rebuild.
Should we hire locally in the Nordics or elsewhere in Europe?
Choose based on working-hour overlap, communication and delivery evidence rather than location alone. Confirm the actual team’s time zone, meeting language, support hours and holiday coverage in the agreement.
How should we compare agency costs?
Compare total ownership costs for the same scope, not just the build fee. Ask each proposal to separate discovery, implementation, content migration, third-party services and ongoing support, and to explain how changes are charged.
What should a headless Shopify case study show?
A useful case study explains the client’s requirements, the agency’s contribution and how outcomes were measured. Ask to speak with a reference and check whether the people behind the work will be involved in your project.
How do we assess Sanity CMS experience?
Ask the agency to demonstrate an editorial workflow comparable to yours in Sanity. Have your editors test content creation, previews and publishing, and ask how the content model will be maintained after launch.
Who should own the code and accounts?
Your agreement should explicitly define ownership and access for code, content and accounts, with third-party licence terms listed separately. Require enough documentation and handover support to let your team or a new partner operate the storefront.
