Available for hire

Full-Stack
Architect &
Problem Solver.

I'm Juan Zapata. I architect scalable web ecosystems and sophisticated backend infrastructures. Specializing in React, Node.js, and TypeScript, I bridge the gap between complex engineering challenges and seamless user experiences, enhanced by cutting-edge AI integration.

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Tech Stack

Technical Arsenal

A robust combination of systems engineering, frontend precision, and AI model evaluation.

See Experience

Full-Stack Core

JavaScript (ES6+) TypeScript React.js Node.js PHP

AI & Optimization

Generative AI Prompt Engineering Code Evaluation LLM Testing

DevOps & Systems

Docker AWS S3 MySQL REST APIs Git

Career Timeline

Scale AI

Technical Squad Lead & Senior GenAI Engineer

02/2025 – Present
  • Lead a cross-functional team of 5+ engineers evaluating AI code quality across 12+ LLMs.
  • Specialize in JavaScript/TypeScript analysis, developing 100+ comprehensive test prompts.
  • Identify critical bugs and security vulnerabilities in AI-generated solutions.
  • Increased team efficiency by 30% through standardized review processes.

Millennium Center

Full-Stack Developer

04/2024 – 02/2025
  • Architected enterprise system using Node.js, React, TypeScript, Docker, and MySQL.
  • Built complex microservices for shift management and payroll processing.
  • Developed an intelligent WhatsApp bot with customizable conversation flows.
  • Reduced operational costs by 35% through process automation.

Energia Solar Helios

Full-Stack Developer

02/2022 - 03/2024
  • Created ALUMAT, a comprehensive city infrastructure management platform.
  • Developed credit application systems with PHP and AWS S3 integration.
  • Integrated Dolibarr CRM for enhanced product/invoice management.
  • Improved application processing efficiency by 45%.

Engineered Solutions

Scalable architectures and complex systems built to solve real business problems.

Support Center Manager

Support Center Manager

Enterprise Management System

Comprehensive system built with React.js and Node.js managing shift rotations, payroll processing, and employee performance. Features Docker containerization and automated expense reporting.

React Node.js Docker
ALUMAT

ALUMAT

Infrastructure Management

Software designed to manage city light poles. Optimizes maintenance, installation, and replacement tasks. Features a work order system, location lookup, and inventory tracking.

Express MySQL Maps API
ARIA Framework

ARIA Framework

WhatsApp Automation Bot

A flexible framework managing WhatsApp bots for sales and support. Allows creation of custom conversation flows, rich media messaging, and database integration for dynamic responses.

Node.js WhatsApp API React
Helios Platform

Helios Platform

Credit & Payroll System

Platform for managing credit applications and job listings. Integrates with Dolibarr ERP/CRM. Handles medical exams, interviews scheduling, and payroll calculation.

PHP MySQL CRM

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Currently accepting new projects and job opportunities.
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