Ecommerce and marketplaces

Ecommerce and marketplace development

We build online sales platforms that scale: high-performance headless stores, B2B and B2C marketplaces with multiple sellers, payments, subscriptions and every integration your operation needs.

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Digital commerce

Selling online is a software problem, not just a catalog problem

A store that converts, a marketplace that retains buyers and sellers, or a migration that keeps its SEO are, at their core, architecture decisions. We have spent years building commerce platforms in production: we know when a standard platform is enough and when the business needs custom development.

+35%

Conversion uplift with a custom checkout

2 sides

Buyers and sellers in marketplaces

<1s

Load time with headless architecture

0

SEO loss in well-planned migrations

What we build

Ecommerce and marketplace solutions

From headless online stores to multi-vendor marketplaces, with the payments, subscriptions and integrations that make the operation run.

Custom e-commerce

Headless online stores with complex catalogs, optimized checkout, multi-channel inventory and integrated logistics. For when Shopify or WooCommerce fall short and customizations hold back growth.

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B2B marketplace

Business-to-business commerce platforms: per-customer catalogs, negotiated pricing, recurring orders, trade credit and approval workflows. Digitize entire wholesale sales channels.

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PropTech marketplace

Real estate and space marketplaces: geolocated search, online booking, recurring payments and two-sided market management, like the one we built for TrasterOne.

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Shopify migration

We migrate stores from WooCommerce, Prestashop or Magento to Shopify and Shopify Plus, preserving catalog, customers, orders and SEO rankings, with redirects and full validation.

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Payment gateways

Integration of Stripe, Redsys, Adyen and Bizum with split payments for marketplaces, recurring payments, fraud prevention and automatic reconciliation with your accounting.

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Subscriptions and billing

Recurring revenue models on top of your store or marketplace: plans, trials, upgrades, dunning and automated invoicing connected to your ERP.

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Online store or marketplace? We help you decide the right architecture.

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Process

How we run a digital commerce project

A process designed to launch fast, validate with real data and scale on a solid foundation.

01

Discovery

Business model, catalog, channels and volumes. Together we decide whether your case calls for a standard platform, custom development or a hybrid.

02

Architecture

Stack, integrations (ERP, logistics, payments) and data model. For marketplaces, we define the mechanics of both sides of the market.

03

MVP

Complete purchase flow in production in 8-12 weeks: catalog, checkout, payments and management panel. The minimum needed to truly sell.

04

Measurement

Conversion analytics, funnels and A/B testing from day one. Product decisions are made with data, not opinions.

05

Scaling

Continuous iteration: new features, more channels, internationalization and performance optimization as volume grows.

Indicative pricing

How much an ecommerce or a marketplace costs

Real ranges based on project complexity. Every proposal is closed with a concrete scope and price after discovery.

Custom online store

€25,000–50,000
2-3 months
  • Catalog and optimized checkout
  • Headless architecture
  • Payments and basic integrations
  • Conversion analytics

Marketplace MVP

€40,000–80,000
3-4 months
  • Two sides of the market
  • Seller onboarding
  • Split payments and commissions
  • Admin panel

Complete platform

€80,000–120,000+
4-6 months
  • ERP and logistics integrations
  • Multi-channel inventory
  • Multi-language and multi-currency
  • SLA and continuous evolution

Indicative ranges excluding VAT. For a detailed cost estimate, request a free consultation.

Case studies

Commerce platforms we have built

Online stores and marketplaces in production with measurable results.

TrasterOne

Storage unit rental marketplace with online booking, recurring payments and geolocated search. It connects space owners with people who need storage.

Storage marketplace

Cawa

Social commerce engine that lets brands sell through content creators. Commission system, conversion tracking and dashboards for brands.

Social commerce for brands

Opapeleo

Online store for office supplies and stationery with a catalog of thousands of products, wholesale supplier integration and WooCommerce optimized for performance and SEO.

WooCommerce e-commerce

Guides from our blog

How to build a successful marketplace Marketplace development guide Shopify Plus vs custom development Stripe vs Redsys vs Adyen Implementing recurring subscriptions Migrating to Shopify Plus
FAQ

Frequently asked questions about ecommerce and marketplaces

What is the difference between an ecommerce and a marketplace?
In an ecommerce you sell your own catalog: you control product, price, stock and logistics. In a marketplace you connect sellers and buyers: the software manages two sides of the market, with seller onboarding, payment splits, commissions and trust systems (ratings, disputes). Technically they are very different projects: a marketplace is considerably more complex because the product is the market's liquidity, not the catalog.
When does custom development pay off versus Shopify or WooCommerce?
If your store is a standard catalog with a conventional checkout, a platform like Shopify is the best option for cost and speed. Custom development pays off when the model does not fit the mold: catalogs with complex logic (configurators, per-customer pricing, B2B), a checkout heavily optimized for your vertical, multi-channel sales with centralized inventory or any marketplace model. The clear signal: when customizations and plugins exceed 40% of the project, the standard platform ends up more expensive than building custom.
How much does it cost to develop a marketplace?
A marketplace MVP with both sides of the market working (seller onboarding, catalog, checkout with split payments and admin panel) ranges between 40,000 and 80,000 euros in 3-4 months. A complete platform with ERP integrations, logistics, multi-language and advanced trust features can exceed 120,000 euros. We always recommend starting with the MVP: the biggest unknown of a marketplace is not technical, it is achieving liquidity (supply and demand), and it is worth validating it before building advanced features.
How do you handle payments in a marketplace?
With split payment solutions like Stripe Connect: the buyer pays once and the platform automatically distributes the money between the seller and the marketplace commission, handling seller KYC, withholdings and refunds. For the Spanish market we also integrate Redsys and Bizum when the audience requires it. The choice of gateway shapes the marketplace's operations, so we define it during the architecture phase.
Can I migrate my current store without losing SEO rankings?
Yes, if the migration is planned: a complete URL map with 301 redirects, preservation of metadata and structured data, migration of content and images with their attributes, and Search Console monitoring during the following weeks. This is the process we follow in Shopify migrations and in custom platform changes. A well-executed migration not only loses no SEO: it usually gains positions thanks to the performance improvement.
Let's get started

Let's build your online sales platform

Tell us about your business model and we will propose the architecture, the plan and the budget to launch it with confidence.

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Ecommerce and Marketplace Development

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info@soamee.com Cink Coworking · C. del Limonero, 22, 28020 Madrid
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