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Brad Guillen Garcia

@bradguillengarcia

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Senior Web Developer specializing in React, delivering scalable migrations and performance-focused web apps.

Costa Rica

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What I'm looking for

I’m looking for a React-focused role where I can lead migrations (micro-frontends, state management), improve performance, mentor teams, and ship clean, maintainable web applications in an agile environment.

I’m a Senior Web Developer with 8+ years in web development, specializing in React. I build and maintain large-scale applications, drive technical migrations, optimize performance, and consolidate codebases into clean, maintainable solutions within agile teams.

At Keller Williams Inc., I owned multiple interconnected frontend applications and led a Micro Frontend migration to improve deployment independence and scalability. I also migrated the data layer by removing Redux for a more maintainable, performant state approach, reduced dashboard load time with lazy loading, and unified multiple repositories to eliminate duplication. Earlier, as Team Lead / Full Stack Developer at Advision development, I mentored a frontend team of four and led a migration from a legacy React CMS to WordPress via REST-connected microservices.

Experience

Work history, roles, and key accomplishments

Current

Senior Web Developer

Current

Keller Williams Inc.

Nov 2020 - Present (5 years 5 months)

Owned and maintained 3 interconnected frontend applications for a real estate technology platform and coordinated cross-project features and fixes. Led migrations to a micro frontend architecture, removed Redux (reducing boilerplate ~40%), and improved dashboard load time by 35%+ using lazy loading.

React TypeScript Module Federation GraphQL Redux State Management Performance Optimization Lazy Loading CI CD

Team Lead / Full Stack Developer

Advision Development

Nov 2017 - Nov 2020 (3 years)

Led a frontend team of 4, mentoring developers through code reviews and requirement analysis while facilitating Scrum ceremonies and stakeholder communication. Migrated a legacy React CMS to a WordPress CMS via REST APIs to microservices, and developed reusable components for 3+ web applications.

React Frontend Architecture WordPress APIs Microservices Scrum Mentoring Code Review Deployment Management Agile

Software Developer

First Factory

May 2016 - Nov 2017 (1 year 6 months)

Built a Yeoman generator to scaffold full CRUD APIs in Spring Boot (Java) or Node.js based on user-selected options. Architected a Java REST API from scratch using Hibernate, Jersey, JUnit, and Mockito, and supported enterprise applications with Java 8, JSP, Spring, and jQuery.

Yeoman Spring Boot Node.Js REST APIs Webpack Google Apps Script Hibernate Junit Mockito Selenium NodeJS

Software Developer Intern

Intertec International

Oct 2014 - Nov 2014 (1 month)

Developed a SharePoint application using C#, Java, and SQL. Prepared daily progress reports for the Operations Manager and participated in daily and weekly meetings.

SharePoint C Java SQL Progress Reports