Juan Carlos Guajardo, Developer in Monterrey, Mexico
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Juan Carlos Guajardo

Verified Expert  in Engineering

Software Developer

Monterrey, Mexico
Toptal Member Since
April 7, 2022

Juan Carlos is a hands-on person who likes to play around and tweak things, especially processes and the infrastructure that connects them. He tries to document as much as possible and enjoys using RDoC, Javadoc, and JSDoc as much as possible, but he adjusts naturally to whatever the project's preference is.


Ruby on Rails (RoR), Ruby, Docker Compose, Docker
Ruby, Ruby on Rails (RoR), RSpec, React, TypeScript, Mapbox
HP Inc
Java 7, Java 8, Node.js, Amazon Web Services (AWS), AWS Lambda, Terraform...




Preferred Environment

Ruby, Linux, Ruby on Rails (RoR)

The most amazing...

...achievements I've had is upgrading legacy apps to modern Ruby and RoR and working on the app's high-throughput telemetry data process.

Work Experience

Senior Software Engineer

2021 - PRESENT
  • Upgraded legacy applications to modern Ruby and RoR and added new features. Wrote documentation along the way.
  • Upgraded dependencies when working on new features to ease up later upgrade process occasionally.
  • Implemented new features and followed along with quality assurance tests to increase release speed.
Technologies: Ruby on Rails (RoR), Ruby, Docker Compose, Docker

Senior Full-stack Developer

2020 - 2021
  • Managed a high-scale application with high throughput for API format, as well as browser UI interaction.
  • Worked on Mapbox and WebGL integration using React and TypeScript via web components.
  • Implemented new features with full code ownership practices from start to deployment.
Technologies: Ruby, Ruby on Rails (RoR), RSpec, React, TypeScript, Mapbox

Senior Software Engineer

2018 - 2020
HP Inc
  • Worked on an application to process collections of telemetry data, ensured data consistency with local and remote databases, and triggered relevant processes.
  • Implemented new features to the existing codebase while updating legacy code.
  • Documented existing processes, features, and peripheral microservices.
Technologies: Java 7, Java 8, Node.js, Amazon Web Services (AWS), AWS Lambda, Terraform, Serverless Framework, Jenkins

Software Engineer

2018 - 2018
  • Designed and implemented microservices to interact between carriers from different countries and internal applications.
  • Designed CI/CD pipelines using GitLab CI to automate deployments to production.
  • Designed, documented, and implemented new features (DB, UX, and processes) with minimal overhead and easy extension/customization to an internal CMS.
Technologies: PHP, Laravel, GitLab CI/CD, Bash, Linux, PHPUnit

My Finances Progressive Web Application (PWA)

A privacy-focused, client-only PWA to keep a record of expenses. Easy to use, easy to erase.

It's a front-end application written with Vue.js storing data in the browser's database using Dexie.js and mostly Creative Commons images for icons.

Recycling Materials CRM

A Ruby on Rails full-stack application to store and visualize recycling opportunities of a larger project.

For the front end, I used Vue.js and VueX with Webpacker connecting the build process with RoR, PostgreSQL, and PostGIS for geo operations.

System Administrator

Linux Foundation


Vuex, Vue, Vue 2, React, Node.js


RSpec, Docker Compose, Terraform, Jenkins, GitLab CI/CD


Ruby on Rails (RoR), minitest, Serverless Framework, Laravel, PHPUnit


Ruby, JavaScript, TypeScript, Java 7, Java 8, PHP, Bash


Linux, Docker, Mapbox, Amazon Web Services (AWS), AWS Lambda


System Administration

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