Juan Fernando Lozoya Valdez

Full Stack Developer

Computer Systems Engineer experienced in building scalable web solutions (React & Node.js). Passionate about automation, performant UIs, and user-friendly tools.

Download CV

Profile

Computer Systems Engineer with 7+ years of experience delivering scalable web solutions for Silicon Valley companies. Specialized in fullstack JavaScript (React, Node.js) with a proven record of improving product performance, usability and reliability. Experienced leading distributed teams and driving innovation in test automation and user interaction technologies.

Experience

Functionize

Full Stack Developer · SEP 2019 - SEP 2025
  • Built and maintained core features of an AI-driven testing platform using React.
  • Improved frontend performance and responsive behavior across devices.
  • Maintained backend services primarily in Node.js and built test automation tooling.
  • Built Architect a Chrome extension to record user interactions for automation.

Ventus Technology

Tech Lead · DEC 2018 - SEP 2019
  • Led a team of 4 developers building cross-platform apps with React Native.
  • Responsible for technical decisions and solution design.

CIMAV

Resident Engineer · JUN 2017 - DEC 2017
  • Developed a cross-platform app for field sampling of environmental pollutants (React Native).

Education

2013 - 2017 · Computer Systems Engineering (mobile specialization)
ITD | Durango Institute of Technology — B.E. (GPA: 9.5 / 10.0)

Projects

AI Test Platform UI

AI Test Platform UI

Functionize

Frontend for an AI-driven test automation platform, focusing on performance and large datasets.

ReactNext.jsReduxNode.jsTailwindPythonPHPDockerPerformanceAWSGCloud
ViewDetails
Architect

Architect

Functionize

Chrome extension that records user interactions (clicks, typing, drags, navigation, downloads, uploads, custom js injections, etc...) into a structured list for automation.

Chrome ExtensionJavaScriptReduxAutomationTailwind
ViewDetails
Rave

Rave

Personal Project

This application is an evolving social network featuring integrated payment gateways, infinite scrolling, role-based user access, user analytics, and a dedicated blog page.

IonicMySQLRESTful APIHibridLaravelOAuth2Online Payments
View
Insurance Wallet

Insurance Wallet

Ventus Technology

Built a reliable interface for distributing insurance policies, integrating SQL procedures with an API deployed on Azure’s server infrastructure.

SQLAzureMiddlewaresAPIsBackend
Field Sampling App

Field Sampling App

CIMAV

Cross-platform React Native app to record environmental pollutant samples and sync to server.

React NativeTypeScriptSQLiteRESTful APIMobile
Dockerized Chat

Dockerized Chat

Personal Project

This project is a CI/CD pipeline automation exercise for a React-based chat application and an Nginx reverse proxy. Both the client and server applications are automatically deployed and updated through the pipeline.

ReactSocket.ioNode.jsDockerCI/CD
ViewDetails
This Portfolio

This Portfolio

Personal Project

It is built with React, Next.js, and TypeScript, with a CI/CD pipeline for integration into AWS.

ReactNext.jsTypeScriptCI/CDAWS
View

Contact me