Mario Alarcón
Consultor Técnico Certificado Sage X3 at AITANA
Valencia, Valencian Community, Spain
Summary
🤩
RockstarMario Alarcón is a seasoned Sage X3 technical consultant with 12 years of experience delivering ERP implementations, integrations and custom development across Spain, currently based in Valencia. He combines deep hands-on skills in Sage X3 architecture, web services, Crystal Reports and data integrations with a background in Oracle, Java and PHP that lets him bridge legacy systems and modern web stacks. Mario has led development teams and training efforts at multiple consultancies and has notable full‑stack open-source contributions around React + Rails tooling and test infrastructure. Practical and client-focused, he has implemented solutions for diverse sectors—from retail and foodservice to manufacturing—often tackling complex integrations between ERPs and external platforms. An habitual problem-solver, he pairs configuration and development expertise with a habit of improving testability and build tooling behind the scenes.
12 years of coding experience
17 years of employment as a software developer
English
Stackoverflow
3,588reputation
1.1mreached
79answers
3questions
error-handling
top-5%
ruby
top-5%
ruby-on-rails
top-5%
Github Skills (24)
javascript10
react-components10
testing10
rspec10
rails10
capybara10
react-component10
webpack10
webpacker10
ruby-on-rails10
react10
rubygems9
ruby-rails9
ruby9
error-handling9
Programming languages (13)
Github contributions (5)
shakacode/react_on_rails
Sep 2015 - Aug 2018
Integration of React + Webpack + Rails including server-side rendering of React, enabling a better developer experience and faster client performance.
Role in this project:
Full-stack Developer
Full-stack DeveloperContributions:8 commits, 12 PRs, 26 pushes in 2 years 11 months
Contributions summary:Mario primarily focused on setting up and improving the testing infrastructure for the `react_on_rails` project. This included integrating Capybara for integration tests, adding tests for React components on the index page, and creating basic test coverage for the helper methods. Furthermore, the user extracted options for the `react_component` helper and addressed regressions related to the `json_safe_and_pretty` method. These contributions improved the project's test coverage and maintainability.
railsreactserver-side-renderingwebpackreact-rails
shakacode/react-webpack-rails-tutorial
Jul 2015 - Jan 2016
Legacy full-app React on Rails tutorial repo and live demo. See reactonrails.com/examples for current maintained demos.
Role in this project:Full-stack Developer
Full-stack DeveloperContributions:8 commits, 14 PRs, 1 push in 6 months
Contributions summary:Mario primarily contributed to the frontend and related configurations of the React-based application within the Rails environment. They fixed UI-related issues and refactored existing code, including updates to the `CommentBox`, `CommentForm`, and `CommentList` components. Furthermore, the user integrated the `react_on_rails` gem for client-side rendering, and refactored build configurations. The contributions also included changes related to dependency management (adding phantomjs gem).
react-on-railsreactwebpackrailsruby-on-rails
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