You're seeing this page as if you were . The main menu is still yours, though. Exit from immersion
Alejandro UdaquiolaAU

Alejandro Udaquiola

Ruby on Rails & Shopify Developer

€300/day
8 projects
Málaga, ES
3-7 years

Average response time: 4 hours

Freelancer profile translated to English.
Back to original language

About Alejandro

Hello! I'm Alejandro,

I am a backend developer specializing in Ruby on Rails and Shopify. I help e-commerce businesses and companies build, improve, and maintain robust applications, focusing on performance, scalability, and code quality.

What I do:

  • Web application development with Ruby on Rails
  • Shopify development: apps, Shopify Functions, and theme customization (Liquid)
  • Design and build REST APIs
  • Integration of payments, ERPs, analytics, and other third-party services
  • Database modeling and SQL query optimization
  • Process automation and data synchronization between systems
  • Bug fixing, maintenance, and improvement of systems in production

My focus is on building maintainable and well-structured software, paying attention to the technical details that impact long-term product growth.

I seek long-term working relationships where I can contribute as a trusted developer for the technical evolution of the product, not just for one-off tasks.

If you need help with your backend, your Shopify store, or your application, let's talk about your project.
  • English

    Fluent

  • Spanish

    Native or bilingual

  • Portuguese

    Basic

  • French

    Basic

Remote only
Primarily works remotely

Experience

  • EL CAFE DE DON MANUEL
    Malt logoOn Malt
    Shopify Integration ↔ a3factura
    RETAIL (LARGE RETAILERS)
    January 2026 - February 2026 (1 month)
    Málaga, Spain
    • Automatic Shopify-A3Factura synchronization
    • Verifactu regulatory compliance
    • Real-time invoice generation and sending
    • Workflow without manual intervention
    Shopify API E-commerce Web Integration a3factura
  • Sakona Tostadores SL
    Malt logoOn Malt
    Shopify Integration ↔ a3factura
    HOSPITALITY
    January 2026 - February 2026 (1 month)
    Málaga, Spain
    • Automatic Shopify-A3Factura synchronization
    • Verifactu regulatory compliance
    • Real-time invoice generation and sending
    • Workflow without manual intervention
    Shopify API Ruby on Rails a3factura Web Integration
  • Blóð
    Malt logoOn Malt
    Shopify development tasks in
    December 2025 - January 2026 (1 month)
    Barcelona, Spain
    Project tasks:

    • Shopify theme development
    • Bug fix and theme improvements
    • Research on integration with inventory management system
    Shopify Liquid JavaScript

Reviews

5.0

Out of 8 ratings

S

Sakona

Integración A3Facturas/Shopify - Sakona Tostadores SL

Reviewed on 3/10/2026

I contacted Alejandro through a recommendation and honestly, I have nothing but good words for him. The work has been impeccable in all aspects. From the beginning, he was very communicative and explicit when shaping the project, and so it was. A communicative, attentive, practical, professional, involved, and resourceful person.
D

Daniel

Integración A3factura/Shopify - EL CAFE DE DON MANUEL

Reviewed on 3/10/2026

100% recommended. I found Malt through internet suggestions and honestly, I had many doubts about what I was doing since I had never contacted programmers before and you always have that fear that things will go wrong. But nothing could be further from the truth. Once I presented the project I needed, Alejandro was the person who gave me the most peace of mind and confidence. He explained things very well, the steps to follow, and that's why I accepted his project. And once we started working together, I have to give him a 10 in everything: attention, communication, problem-solving, involvement in the project, EVERYTHING. So, if anyone is new to this like I was, I can confirm that this person is completely trustworthy and, above all, very professional, so I can do nothing but recommend him 200%.

Recommendations

These freelancer profiles also match your criteria

AgathaA

Agatha Frydrych

Backend Java Software Engineer

4.7

(3)

2

BaptisteB

Baptiste Duhen

Fullstack developer

4.6

(4)

5

AmedA

Amed Hamou

Senior Lead Developer

4

(2)

7

AudreyA

Audrey Champion

Web developer

4.3

(3)

4

Education

  • Le Wagon
    Full Stack Developer junior
    2020

Skill set

Categories