José Chaparro | Full Stack Engineer

About Me

Full Stack Engineer with 2+ years of production experience building backend-heavy systems in Python and .NET, deploying cloud infrastructure on AWS, and developing cross-platform applications.

Currently at Moneta Market, where I own the microservices architecture: a 6-container production platform integrating ML pipelines, event-driven webhooks, and a C# desktop app. I also work as an independent contractor building full-stack systems with React, FastAPI, and PostgreSQL.

Languages

Spanish Native

English Upper-Intermediate (B2)

2+

Years Experience

10+

Technologies

Work Experience

August 2025 - Present

Full Stack Engineer

Moneta Market LLC

Architected the company's first containerized platform: 6-service Docker Compose stack (2 FastAPI microservices, Label Studio, MLflow, Nginx reverse proxy) deployed on AWS EC2 with private networking and automated health checks
Designed an 18-table PostgreSQL schema on AWS RDS with 18 foreign keys, 28+ strategic indexes, a custom idempotent migration system, and soft-delete audit trail; accessed via SSH tunnel through EC2 bastion host
Built an event-driven FastAPI webhook service integrating Label Studio with S3: Repository pattern, atomic DB/S3 rollback on failure, async connection pooling, and in-memory cache with DB fallback
Developed a cross-platform C# desktop app (.NET 10, Avalonia, migrated from Windows-only WPF) for human review of ML-labeled video frames: MVVM architecture, two-pass verification workflow, and sliding-window prefetch cache
Implemented least-privilege IAM policies and AWS Secrets Manager for credential management; used LocalStack for local S3 emulation without exposing production credentials

FastAPI Docker Compose AWS PostgreSQL C# / .NET 10 Avalonia Nginx

February 2025 - Present

Full Stack Developer

Independent Contractor

Built complete web and mobile applications using React, React Native, and Next.js, delivering responsive interfaces and optimized user experiences
Designed backend architectures with FastAPI, Django, and Express.js, scalable RESTful APIs with PostgreSQL and SQLite, normalized schemas, and efficient query design
Self-host client applications on a personal Linux server using Dokploy and Docker Compose (backends, frontends, and databases); manage DNS through Cloudflare and expose services securely with Cloudflare Tunnels (no open ports), offering clients a low-cost alternative to Vercel or AWS

React React Native Next.js FastAPI Django Express.js Dokploy Cloudflare

March 2024 - August 2025

.NET Software Developer

Grupo Roga

Maintained and extended the internal ERP used across 170+ branches and 1,750+ employees (Mueblería El Pasito / Villarreal Muebles / Dinexpress); built modules for multi-branch inventory, pricing, accounts receivable, and POS in .NET Framework
Designed SQL Server database architecture supporting multi-branch retail operations: stored procedures for inventory aggregation and pricing logic, automated reports and email delivery via SQL Server Agent
Standardized security practices across the development lifecycle: password manager for credential handling, physical security keys, and formalized coding processes

.NET Framework C# SQL Server Stored Procedures Scrum

Technical Skills

Languages

Python JavaScript C# SQL HTML5 / CSS3

Frontend

Next.js React React Native

Backend

FastAPI Django Node.js Express.js .NET Framework Avalonia (.NET 10)

Cloud & Infrastructure

AWS EC2 / RDS / S3 IAM Secrets Manager Docker Compose Nginx Dokploy Cloudflare Tunnels Linux / Ubuntu GitHub Actions

Databases

PostgreSQL SQL Server SQLite

Architecture

Microservices RESTful APIs MVVM Repository Pattern Event-driven

Featured Projects

In Progress

Smart Cooler Grab-and-Go

Full-stack system with cloud infrastructure, RESTful APIs, and database management. Built with Flask, PostgreSQL on AWS, and integrated ML capabilities.

Flask AWS PostgreSQL Python

Contact for Details