Ecommerce Agency: Online Stores That Sell

Online stores from €8,000 (typically €10,000-30,000), ready to launch in about 10 weeks. We design the strategy, the buying experience and the CRO, then build it on the platform that fits your business: Shopify, Magento, BigCommerce, PrestaShop or composable.

Talk to an architect See platforms
  • 17 Years in web and ecommerce
Scroll

In numbers

Why Kiwop as Your Ecommerce Agency

Real experience, not sales promises.

  • 5 Ecommerce Platforms Shopify, Magento/Adobe Commerce, BigCommerce, PrestaShop and composable
  • ERP · payments · PIM Integrations We connect the store to your operations, not leave it isolated
  • Target Core Web Vitals Performance as a requirement, not an extra

Definition

What Does an Ecommerce Agency Do and How Is It Different?

An ecommerce agency does more than build an online store: it defines what to sell and to whom, picks the right platform, designs the buying experience, integrates payments and logistics, and optimizes conversion continuously. The website is just the tip of the iceberg.

The difference between a store that sells and one that doesn't usually lies in the decisions made before design: catalog architecture, product page, checkout, speed, and integration with your ERP and payment gateway. That's why we work strategy and experience first, and only then choose the technology. A wrong platform choice costs you for years; a good one scales with you.

What's included

What the Service Covers

From strategy to a store in production. No loose ends.

  • Consulting and platform selection based on catalog, market and operations
  • UX/UI design of the buying experience (catalog, product page, checkout)
  • Custom theme development or headless frontend
  • Integrations with ERP, payment gateways and PIM
  • Platform migration with no SEO loss (301 redirects)
  • Continuous CRO and ongoing maintenance

Why

Installing a Theme vs Building a Business

Where the sale is lost (or won).

Most online stores don't fail because of design, they fail because of friction: long checkout, slow site, poorly organized catalog, product pages that don't answer doubts. We work on every lever that moves conversion. We start with strategy and buying experience, measure with data, and choose the platform that best serves your business, not the one that suits us most.

analytics/funnel-ecommerce.sql
-- Where your customers drop off
SELECT
checkout_step,
COUNT(*) as sessions,
SUM(order_completed) as conversions
FROM checkout_events
GROUP BY 1 ORDER BY 1;
  • Conversion Focus
  • Data-led Decision
  • The right fit Platform

Key points

Platforms We Work With

This is the generic entry point. Each platform has its own page with the detail of how we execute it.

  1. 01

    Shopify and Shopify Plus

    Stable SaaS to scale fast, with a headless option (Hydrogen) for high-volume brands. We are a Shopify partner. See Shopify development.

  2. 02

    Magento / Adobe Commerce

    Maximum control for large catalogs, B2B and complex business rules. Performance with Hyvä. See Magento development.

  3. 03

    BigCommerce

    Open SaaS, strong in B2B (price lists, payment terms) without Magento's operational cost. See BigCommerce development.

  4. 04

    PrestaShop

    Established open source for European SMEs that want full code ownership and contained costs. See PrestaShop development.

  5. 05

    Composable Commerce

    Headless / MACH architecture: each piece (catalog, search, payments, CMS) best of breed, connected by APIs. See composable commerce.

How we work

How We Work

From idea to a store that sells and stays healthy.

  1. 01

    Strategy and Platform Selection

    We analyze catalog, market, operations and required integrations. We recommend the platform with arguments, not by trend. No vendor bias.

    Week 1-2
  2. 02

    UX and Buying Experience

    We design catalog, product page and checkout to reduce friction. Mobile-first. Prototypes validated before development.

    Week 2-4
  3. 03

    Development and Integrations

    We build the theme or headless frontend. We connect ERP, payment gateway and PIM. Core Web Vitals passing. 301 redirects if there's a migration.

    Week 4-10
  4. 04

    Launch and Continuous CRO

    Controlled go-live, monitoring and conversion optimization with data. The store isn't shipped and forgotten: it evolves.

    Ongoing

Summary

Executive Summary

What you need to decide.

An ecommerce agency with judgment saves you the cost of picking the wrong platform and of a store that doesn't convert. We work strategy, buying experience, platform and integrations as one project.

Building digital projects from Reus (Spain) since 2009, with five real ecommerce platforms in our portfolio. No lock-in: the code and the account are yours. Investment scales with the project scope.

  • 17 Years of Experience
  • 5 Ecommerce Platforms
  • No Vendor Lock-in

For the CTO

Summary for CTO / Technical Team

Architecture, performance and integrations.

Core Web Vitals passing as a requirement (LCP <2.5s, INP <200ms, CLS <0.1). Headless frontend when the case justifies it (Hydrogen, MACH); optimized theme when it doesn't. Product Schema.org for rich snippets.

API and webhook integrations with ERP (SAP, Business Central, Odoo), payment gateways and PIM. Migrations with URL mapping and 301 redirects to avoid losing rankings. GDPR compliance with EU-based servers.

Technologies

  • Shopify Hydrogen
  • Magento/Hyvä
  • BigCommerce
  • PrestaShop
  • GraphQL Storefront
  • Stripe/Redsys
  • Algolia
  • GA4
  • Headless when it adds value, optimized theme when it suffices
  • ERP/payments/PIM integration via API
  • Migration with no SEO loss (301 + GSC)

Who it is for

Is It for You?

We work best with those who want to sell, not just have a pretty website.

Who it's for

  • Businesses that sell online (or want to start) and measure revenue, not visits.
  • Brands that have grown and whose current platform has become too small.
  • Companies with a large catalog that need to integrate ERP, payments and logistics.
  • B2B or B2C projects with business rules a standard theme can't cover.
  • Anyone who wants an honest platform recommendation, without vendor bias.

Who it's not for

  • Those looking for the cheapest possible ecommerce with no strategy behind it.
  • Projects that need to be online tomorrow with no room to do it well.
  • If you expect the store to sell on its own without acquisition or CRO work.
  • Very specific custom marketplaces (better discussed as custom development).

Risks and how we cover them

Risks and Mitigation

Transparency about what can go wrong in ecommerce.

  1. 01

    Choosing the wrong platform

    Mitigation

    Recommendation based on catalog, market and integrations, not on what we sell most. We document the reasons.

  2. 02

    SEO loss in a migration

    Mitigation

    Exhaustive URL mapping, 301 redirects before the switch and Google Search Console monitoring in the first weeks.

  3. 03

    Fast in demo, slow in production

    Mitigation

    Core Web Vitals passing as an acceptance criterion, with real catalog and production load.

  4. 04

    ERP/payment integration that breaks

    Mitigation

    API/webhook integrations with test environments and retries; no fragile patches in the checkout.

Technologies

Technology We Work With

Platforms, integrations and measurement tools.

  • Shopify
  • Shopify Plus
  • Hydrogen
  • Magento
  • Adobe Commerce
  • Hyvä
  • BigCommerce
  • PrestaShop
  • commercetools
  • Medusa
  • Stripe
  • Redsys
  • Algolia
  • Klaviyo
  • GA4
  • Core Web Vitals

The proof

15 Years Building Multi-Platform Ecommerce

Since 2009, based in Reus (Spain), we have built online stores on the market-leading platforms. We are not a single-technology agency: we recommend and build on the one that truly fits each business. Shopify partner and we work with Magento, BigCommerce, PrestaShop and composable architectures.

  • 17 Years of Experience
  • 5 Ecommerce Platforms
  • Core Web Vitals Passing Target
  • Vendor Independence Total

What's included

Investment

Indicative prices excl. VAT, updated September 2026.

  • Online store: from €8,000 (typically €10,000-30,000); with Magento, from €25,000
  • Initial platform consulting: included in the proposal
  • Fixed-scope or phased project depending on needs
  • No lock-in: the code and the platform account are yours
  • Maintenance and CRO: optional, monthly and cancellable (maintenance, €300-900/month)

Sources

Sources for the Figures on This Page

Where the market and case data we cite come from. The rest are estimates based on our experience. Accessed 26 September 2026.

  1. Kiwop indicative prices, September 2026 Online store from €8,000 (typically €10,000-30,000), with Magento from €25,000, and maintenance at €300-900/month, excluding VAT.
  2. Kiwop Labs, observatory of published digital service prices in Spain (September 2026) Median of €1,200 for “Online store” (closed or minimum price; 11 prices verified on 12 Sep 2026). It only counts providers that publish a price.
  3. Kiwop Labs, open dataset of the price observatory Every price with its provider, its URL and the literal published text.
  4. Google, web.dev: Web Vitals “Good” Core Web Vitals thresholds: LCP of 2.5 s or less, INP of 200 ms or less and CLS of 0.1 or less, at the 75th percentile of visits.
  5. Kiwop, about us Kiwop has been working since 2009, based in Reus: hence the years of experience.
  6. Kiwop experience in e-commerce projects (2023-2026) Process timeline: strategy and platform in weeks 1-2, UX in weeks 2-4, and development and integrations in weeks 4-10.

FAQ

Frequently Asked Questions

What people ask before starting an ecommerce project.

Which ecommerce platform is right for me?

It depends on your catalog, market, operations and budget. Shopify to scale fast with low maintenance; Magento/Adobe Commerce for large catalogs and complex rules; BigCommerce for B2B without high operational cost; PrestaShop for SMEs that want full code ownership; composable when you need maximum flexibility. We recommend it with arguments, without bias.

Can you migrate my current store without losing rankings?

Yes. We map every URL, set up 301 redirects before the switch and monitor Google Search Console in the first weeks. Migration is the moment of highest SEO risk, so we plan it in detail.

Do you integrate the store with our ERP and payment gateway?

Yes. We connect the store with your ERP (SAP, Business Central, Odoo), your payment gateway (Stripe, Redsys and others) and your PIM via API and webhooks, with test environments before touching production.

Do you work on CRO or just build the store?

We work on CRO continuously. A store isn't shipped and forgotten: we measure the funnel, find where the sale is lost and optimize checkout, product pages and speed with data.

Do you offer maintenance after launch?

Yes, optional ongoing maintenance: updates, security, performance and conversion improvements. Monthly and cancellable, with no lock-in.

Do you apply artificial intelligence to ecommerce?

Yes, on two fronts with direct impact on sales: AI personalization (recommendations and content tailored to each customer) and intelligent search (semantic search that understands what the customer means, not just what they type). Both integrate on top of your current platform, without replacing it.

How much does an online store cost?

An online store on Shopify or PrestaShop starts at €8,000; most projects fall between €10,000 and €30,000. What drives it up: catalog size, payment gateways, ERP or logistics integration, languages and migrating from your current store. It includes custom design, development, payment and shipping setup, migration with 301 redirects and training. For large catalogs or complex B2B on Magento, from €25,000. Maintenance runs from €300 to €900/month. Packaged-service providers publish lower prices (a median of €1,200 in Spain in our published-price observatory): the difference is custom work, integrations and support. Indicative prices excl. VAT; we close the quote once we have defined the scope.

Why an ecommerce agency and not a single platform?

Because an agency tied to a single technology will always recommend that technology. We work with five platforms and choose the one that fits your business. The platform is a means, not the goal.

Does an online store that sells in Spain have to comply with Verifactu?

If the store issues the invoices of a business taxed in Spain, yes: for the Spanish Tax Agency an online store that invoices is an invoicing system. The legal deadline today is 1 January 2027 for companies and 1 July 2027 for everyone else, and on 5 October 2026 Spain’s Ministry of Finance announced it plans to move it to October 2028 (not yet in the Official State Gazette). A plugin covers the simple case; returns, credit notes and simplified invoices are where they usually fail. We explain it, with prices, on our Verifactu compliance page.

Next step

Shall We Talk About Your Online Store?

Initial consultation with no commitment. We analyze your case and recommend the platform and approach that truly suit you.

Talk to an architect
  • No commitment
  • Response in 24h
  • Custom proposal
Last updated: September 2026

Let's talk.

Initial technical consultation

AI, security and performance. Diagnosis with phased proposal.

  • NDA available
  • Response <24h
  • Phased proposal

Your first meeting is with a Solutions Architect, not a salesperson.

Talk to an architect