Nelvin Jaziel Marquez

Full-Stack Developer | React, Next.js & PostgreSQL

Building under the JazieLabs name

Available for remote & freelance work

About Me

I'm a Full-Stack Developer with hands-on experience building web applications end to end — from React and Next.js front ends to PostgreSQL-backed services exposed through clean REST APIs. I'm currently leading technical development at JazieLabs, where I build and maintain production web solutions with a focus on scalability, clean code and user experience.

Beyond web development, I also have a strong Python background: I've built backend systems with FastAPI, published a library on PyPI, and shipped several computer-vision and automation projects from scratch — experience that gives me a broad, practical toolkit for solving problems across the stack.

Technical Expertise

Frontend

  • React.js
  • Next.js
  • Tailwind CSS
  • HTML / CSS / JavaScript
  • TypeScript

Backend & Data

  • PHP
  • Python (FastAPI, Flask)
  • REST APIs
  • PostgreSQL / SQL
  • SQLite

Practices & Tools

  • Clean Code
  • Git / GitHub
  • Cloud Deployment
  • Web Scraping & Automation

Highlights

My Projects

View all on GitHub →

Venvidrio Hot-Zone Production System

Production-monitoring platform for a glass-bottle plant: real-time output tracking, quality inspections with criticality levels, machine-downtime logging and role-based access for operators, inspectors and admins. Three-tier React SPA → FastAPI REST API → MySQL, with schema auto-provisioning on first run.

ReactViteFastAPIPydanticMySQL
View on GitHub →

Sales Management System

Full-featured sales management tool with automated price updates via web scraping, PDF invoice generation, and SQLite database integration.

PythonFletSQLiteBeautifulSoup
View on GitHub →

AI-Powered CV Generator

Generates professional Europass-format CVs using AI (Gemini), with a FastAPI backend, Streamlit frontend, automated PDF export and Pydantic data validation.

PythonFastAPIStreamlitGemini AI
View on GitHub →

BCV Exchange-Rate API

REST API that scrapes the Venezuelan Central Bank site with BeautifulSoup and serves live currency rates: list all rates, query by symbol, and a POST endpoint that converts an arbitrary amount. Built with FastAPI and automatic OpenAPI docs.

PythonFastAPIBeautifulSoupWeb Scraping
View on GitHub →

Sector — Organization Management

Full-stack management system for a multi-branch organization: member and staff records, attendance tracking, meeting coordination, user administration and report generation. PHP REST API documented with Swagger/OpenAPI, backed by MySQL with versioned migrations.

PHPMySQLREST APIsSwagger
View on GitHub →

TxtToImg — Published Python Library

Open-source library (MIT, published on PyPI) for programmatic text-to-image generation: overlay styled text on a remote image or a generated gradient background, with configurable colour, scale and positioning, then display or export the result.

PythonOpenCVRequestsPyPI
View on PyPI →

PC Control with Facial Recognition

Hands-free computer control using facial gestures and voice commands, with 95% accuracy across varied lighting conditions.

PythonOpenCVMediaPipePyAutoGUI
View on GitHub →

Face-Controlled Rocket Game

Real-time face-tracking gameplay optimized for 60 FPS performance, with dynamic difficulty adjustment.

PythonPygameOpenCV
View on GitHub →

Contact Me

Open to remote, full-time and freelance opportunities.