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Javier Fernández MayoJF

Javier Fernández Mayo

Software engineer | Java | Full-Stack

€350/day
La Coruña, ES
3-7 years

Average response time: 1 hour

About Javier

Soy un ingeniero de software con más de 4 años de experiencia en desarrollo backend y fullstack, especializado en Java y Spring Boot, con conocimientos en Angular y Javascript. He trabajado en empresas de producto final como Idealista y Zara.com, donde he desarrollado soluciones escalables con un alto sentido de ownership y responsabilidad.

Tengo experiencia en el diseño de microservicios, integración con RabbitMQ y PostgreSQL y programación reactiva. Además, he contribuido a proyectos open source en Ruby on Rails y React, destacando mi participación en iNaturalist.

Actualmente, busco proyectos como freelancer con interés en trabajar en entornos internacionales y aportar soluciones eficientes en arquitectura de software, APIs y sistemas escalables.

📍 Basado en España, disponible para trabajo remoto.
💡 Especializado en arquitectura de software, optimización de rendimiento y sistemas distribuidos.

English:
I am a software engineer with over 4 years of experience in backend and fullstack development, specializing in Java and Spring Boot, with knowledge of Angular and Javascript. I have worked in product-based companies like Idealista and Zara.com, developing scalable solutions with a strong sense of ownership and responsibility.

My expertise includes microservices architecture, RabbitMQ, PostgreSQL and working with reactive programming. Additionally, I contribute to open source projects in Ruby on Rails and React, with notable participation in iNaturalist.

I am currently seeking freelance opportunities with a focus on international projects where I can bring value in software architecture, API development, and scalable systems.

📍 Based in Spain, open to remote work.
💡 Specializing in software architecture, performance optimization, and distributed systems.

  • Spanish

    Native or bilingual

  • English

    Fluent

Remote only
Primarily works remotely

Experience

  • Codurance S.L
    Senior Software Craftperson
    July 2025 - April 2026 (9 months)
    Backend development for Webbeds, a global hospitality technology platform,
    using C# and .NET in an agile, TDD environment.

    Collaborate in a cross-functional team applying Software Craftsmanship
    principles. TDD, Trunk-Based Development, pair programming, and continuous
    refactoring.
    C# .NET
  • idealista
    Software engineer
    May 2023 - November 2024 (1 year and 6 months)
    Developing and maintaining the idealista website—the leading real estate platform in Spain, Italy, and Portugal—in the homeowner and login/account management teams, using Spring MVC, Spring Boot, JavaScript, and Kotlin, following DDD principles, making both architectural and product decisions, and delivering value to a 12-year-old legacy codebase by ensuring stability while introducing new improvements.
  • Zara.com – Inditex
    Software engineer
    October 2021 - April 2023 (1 year and 6 months)
    La Coruña, Spain
    Developing and maintaining INDITEX's CRM (MOCA)—a globally used, high-demand, and prestigious platform—in the customer care area, working as the only in-house team member, having responsibilities regarding the product and participating in decision making, using Spring Boot, non-blocking reactive programming with Spring WebFlux, and Angular, and applying TDD principles in a microservices-based, hexagonal architecture.

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Education

  • Bachelor of Science in Computer Science
    University of León
    2020
    Bachelor degree in Computer Science

Certifications

Skill set

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