About

Nicolás Mateos

Nicolás Mateos is a Spanish freelance Shopify developer focused on front-end work for Shopify Plus and B2B stores, based in Madrid and working remotely. He has worked with Shopify since 2021 and as a freelancer since September 2022, with brands and agencies in Spain, the Netherlands and the rest of Europe, in Spanish and English. His specialty is wholesale portals (Companies, Catalogs and price lists), Shopify Functions in JavaScript and Rust, Checkout Extensibility and custom embedded apps (Node.js, Express, Shopify CLI). Since October 2024 he has also been the sole front-end developer at a B2B-focused Shopify Plus agency in Spain.

Quick facts

Location
Madrid, Spain. Works remotely, on Central European time.
On Shopify since
April 2021
Freelance since
September 2022, with 10+ projects
Languages
Spanish (native) and English (professional)
Specialties
Shopify Plus, B2B (Companies, Catalogs and price lists), Shopify Functions (JavaScript and Rust), Checkout Extensibility and customer account extensions, embedded apps, GraphQL ERP integrations
Stack
Liquid, JavaScript, TypeScript, Rust, Node.js, Express, React, PostgreSQL, GraphQL Admin and Storefront APIs, Shopify CLI

Experience

  1. Since July 2026

    Shopify Developer (contract, remote)

    Ecommerce agency, the Netherlands

    Theme customization, storefront features and bug fixes for the agency's client stores.

  2. Since October 2024

    Sole Front-End Developer

    B2B-focused Shopify Plus agency, Spain

    B2B storefronts on Shopify Plus with Companies, Catalogs, price lists, metaobjects and metafields. Shopify Functions in JavaScript and Rust (tiered pricing, discount gates, validation rules), Checkout Extensibility and customer account extensions, embedded apps with Node.js, Express and the Shopify CLI, and GraphQL ERP integrations alongside a backend team.

  3. Since September 2022

    Freelance Shopify Developer

    Agencies and direct clients

    10+ engagements, from week-long theme audits to multi-month custom storefront builds, including platform migrations into Shopify. Allocation and reservation systems with Shopify Functions, embedded apps (Node.js, Express, PostgreSQL) and customer account extensibility, including work for Scandinavian and German brands.

  4. August 2023 – February 2024

    Web Developer

    Reduncle, Shopify agency

    Large influencer storefronts and premium Spanish brand sites with highly custom designs, alongside growth and CRO teams.

  5. January – October 2023

    Front-End Developer

    Growthmile, Shopify agency

    Custom Shopify themes built from scratch for premium B2C brands such as Born Living Yoga, Polos El Capote, Pompeii and Name The Brand.

  6. April 2021 – July 2022

    Front-End Developer

    VRANDED Haus, digital agency (Madrid)

    First Shopify role: Liquid, responsive design, JavaScript and Git.

Got a Shopify project?

Get in touch