Edmundo Perez Castrejon, Developer in Colima, Mexico
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Edmundo Perez Castrejon

Verified Expert  in Engineering

Software Developer

Colima, Mexico
Toptal Member Since
February 24, 2022

Edmundo has been developing web-based information systems for about 15 years. In the last 10 years, he has worked with Ruby on Rails and various JavaScript frameworks. Positive, proactive, and a good communicator, Edmundo enjoys working on front-end and back-end challenges and efficiently collaborates with designers and UI/UX experts. Having had the opportunity to work with some exciting companies, he has also developed excellent eCommerce skills.


Valence Labs
HTML, CSS, Tailwind CSS, Bootstrap, Stimulus, JavaScript, Webpack, eCommerce UX...
Ruby on Rails (RoR), Ruby on Rails API, React, Angular...
Behavior-driven Development (BDD), CSS, Agile, Ruby on Rails (RoR), JavaScript...




Preferred Environment

Ruby on Rails (RoR), CSS, HTML, JavaScript, React, Ruby

The most amazing...

...thing I've helped build was a ModCloth front-end store using Ruby on Rails and later migrating it to an enterprise-level engine, Salesforce Commerce Cloud.

Work Experience

Senior Software Engineer

2021 - 2022
Valence Labs
  • Developed HTML and CSS layouts ready to connect to Phoenix back end.
  • Created style guides and design systems as ready-to-start building blocks for developers.
  • Built basic user interaction for interfaces using Stimulus and other JavaScript frameworks, so the integration with the back end is seamless.
Technologies: HTML, CSS, Tailwind CSS, Bootstrap, Stimulus, JavaScript, Webpack, eCommerce UX, Typing (75+ WPM), Web Layout, Web UI, Software Development

Senior Software Engineer

2016 - 2022
  • Built the information systems and eCommerce sites for various clients using Ruby on Rails (RoR) and front-end frameworks, such as React and Angular.
  • Specialized in CSS architecture, front-end matters, and UI/UX layout building.
  • Empowered and improved my clients' teams and helped them develop fast, easy-to-use, and functional products.
Technologies: Ruby on Rails (RoR), Ruby on Rails API, React, Angular, Test-driven Development (TDD), Behavior-driven Development (BDD), Bootstrap, Tailwind CSS, CSS, HTML, Web Layout, Web UI, eCommerce UX, TypeScript, Typing (75+ WPM), Agile, Salesforce Commerce Cloud (SFCC), Solidus, Software Development, Stimulus, Ruby, Webpack, Sass, Full-stack

Software Engineer

2015 - 2016
  • Built information systems and eCommerce sites for various clients using RoR and front-end frameworks like Angular, Ember.js, and React.
  • Used the Agile methodologies and collaborated with various clients from the USA and Mexico.
  • Learned about eCommerce, search engine optimization (SEO), and marketing to help clients improve conversion and engagement.
Technologies: Behavior-driven Development (BDD), CSS, Agile, Ruby on Rails (RoR), JavaScript, Ember.js, HTML, Search Engine Optimization (SEO), Spree Commerce, eCommerce UX, Typing (75+ WPM), Ruby on Rails API, Test-driven Development (TDD), Web Layout, Web UI, Solidus, Software Development, React, Ruby, Webpack, Sass, Full-stack

Software Engineer

2012 - 2015
Crowd Interactive
  • Assisted a company to create its website using Ruby on Rails and Backbone.js.
  • Helped with the CSS and HTML for many landing pages for clients.
  • Maintained a Spree application, giving back end and front store support as well as implementing new features.
Technologies: Ruby on Rails (RoR), CSS, Sass, HTML, Backbone.js, Test-driven Development (TDD), Ruby on Rails API, Behavior-driven Development (BDD), Web Layout, Web UI, Agile, Software Development, Ruby


While working as a staff augmentation resource for the engineering team at ModCloth, I had the opportunity to collaborate on their eCommerce platform, including the storefront and social commerce. As a developer, I helped with the migration of the platform to the Demandware enterprise platform.


HITRECORD is an open online community for creative collaboration, founded and led by actor and artist Joseph Gordon-Levitt. I helped the engineering team build the class project milestone using Ruby on Rails, Angular, and an in-house CSS framework.

HERB Delivery

HERB Delivery delivers marijuana flowers, edibles, vaporizers, and more straight to its users' door. It was founded in 2014 on the conviction that cannabis consumers deserve better than the service and quality commonly found in the industry. I built this Ruby on Rails 6.0 application on top of the Solidus eCommerce platform and deeply customized it. Also, I assisted in creating the look and feel of the site, created the style guide, and designed system components as pieces for building the site. Finally, I integrated third-party features, such as Alchemy CMS, a very flexible and customizable content management system, Twilio for SMS services, and Klaviyo for email marketing.
2004 - 2007

Master's Degree in Information Technologies

University of Colima - Colima, Mexico


React, Ruby on Rails API, Twilio API, Backbone.js


Salesforce Commerce Cloud (SFCC), Webpack


Ruby on Rails (RoR), Tailwind CSS, Stimulus, Angular, Bootstrap, Cypress, Ember.js


Agile, Test-driven Development (TDD), Behavior-driven Development (BDD), Search Engine Optimization (SEO)


CSS, HTML, JavaScript, Ruby, TypeScript, SQL, Sass




Software Development, Information & Communications Technology (ICT), Human-machine Interface (HMI), Web Layout, Web UI, eCommerce UX, Content Management Systems (CMS), Web Marketing, Email Marketing, Spree Commerce, Typing (75+ WPM), Full-stack

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