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.

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
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
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
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
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
Notes App

Notes App

Personal Project

A modern, collaborative note-taking app built with React Native (Expo). Create, edit, and organize your notes in real time, instantly synced across devices. Includes secure authentication, offline access, and cloud backups for reliability and privacy.

ReactNext.jsTypeScriptCI/CDAWS

Contact me