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Xavi Castro CollXC

Xavi Castro Coll

Flutter senior developer

€300/day
Barcelona, ES
8-15 years

Average response time: 1 hour

About Xavi

I am a Senior Flutter Developer with 8+ years of experience building applications of all sizes, from MVPs to large-scale products used in production. I have worked in teams of 10+ people, collaborating closely with product managers, designers, and backend engineers to deliver reliable, scalable solutions.

One of my key strengths is anticipating the long-term technical challenges that projects face. That’s why I apply a clean architecture approach and a methodical development process, ensuring that every project I work on is maintainable, testable, and ready to grow with your business needs.

I have successfully developed and deployed applications across mobile, desktop, and web platforms, helping companies reach users on multiple devices with a single, consistent codebase.

Currently, I work as a Senior Flutter Developer in a leading company, but I am available for part-time freelance projects that don’t require a full-time commitment. If you’re looking for a developer who combines technical expertise with scalable software practices, I’d be glad to help bring your project to life.
  • Spanish

    Native or bilingual

  • English

    Fluent

  • Catalan

    Native or bilingual

Remote only
Primarily works remotely

Experience

  • Smarting
    Flutter senior developer
    TECH
    September 2023 - Today (2 years and 9 months)
    Barcelona, Spain
    Working as a Senior Flutter Developer on solutions and projects with clean base arquitecture making scalable applications.

    My tasks are to manage and build solutions, built in Flutter, for the company, create standards for other developers can follow in order to build or help in Flutter solutions.

    My role is to set Flutter as a viable technology in the company.
    Dart Flutter Front-End development Git Mobile application
  • SlashMobility
    Flutter developer
    BANKING AND INSURANCE
    March 2022 - October 2023 (1 year and 7 months)
    Barcelona, Spain
    Worked on big application for Insurance sector. The application was used in more than 30 countries. The arquitecture was crucial in this project.
    I worked as a developer in diferent features, bug fixing and refactoring non efficient parts of the applications due to its growing.

    Also I was refactoring and scaling browser-app back office application to manage and use in web.
    Git Front-End development Dart Flutter Mobile application

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Education

  • Grado en Ingeniería
    ESEIAAT-UPC
    2020
    Grado en Ingeniería

Skill set

Categories