Hello, I'm

José Chaparro

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Full Stack Engineer with expertise in backend systems, cloud infrastructure (AWS), and microservices architecture

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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 a 25-table PostgreSQL schema on AWS RDS with 24 foreign keys, 34 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
  • Built the data pipeline's operator tooling (CLIs, idempotent S3-PostgreSQL sync, drift audits) and automated model training via GitLab CI on ephemeral AWS GPU instances with MLflow tracking; prototyped edge inference on NVIDIA Jetson (YOLO on TensorRT)
FastAPI Docker Compose AWS PostgreSQL C# / .NET 10 Avalonia Nginx GitLab CI MLflow
February 2025 - Present

Full Stack Engineer & Co-founder

Bifrost Code — Independent Software Studio

  • Deliver full-stack web apps end-to-end with React, Next.js, NestJS, and Express on TypeScript pnpm monorepos with PostgreSQL; earlier delivered projects shipped with React Native, FastAPI, and Django
  • Production projects for real clients: FisioApp (multi-tenant clinic management, WCAG 2.1 AA audited), Feriu (multi-tenant shared-expense platform), and Karaoke Balu (real-time karaoke request platform with SSE and kiosk mode)
  • Self-host client applications on the studio's own infrastructure — a Proxmox VM running Ubuntu Server with Dokploy and Docker Compose; DNS through Cloudflare and services exposed securely via Cloudflare Tunnels (no open ports), a low-cost alternative to Vercel or AWS
React Next.js NestJS Express.js TypeScript PostgreSQL Dokploy Cloudflare Proxmox
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 FastAPI, PostgreSQL on AWS, and integrated ML capabilities.

FastAPI AWS PostgreSQL Python
Contact for Details
In Production

FisioApp

Multi-tenant management system for physiotherapy clinics: patients, clinical records, appointments, packages, and payments. WCAG 2.1 AA audited, automated off-site backups.

Next.js PostgreSQL Dokploy TypeScript
Contact for Details
In Production

Feriu

Multi-tenant, self-hosted shared-expense platform with a Splitwise-style settlement engine, built as a NestJS + Next.js pnpm monorepo on PostgreSQL.

NestJS Next.js PostgreSQL TypeScript
Contact for Details
In Production

Karaoke Balu

Real-time karaoke request platform for live events: SSE-synced queue, admin panel, self-serve kiosk mode, and Virtual DJ integration. Express + React monorepo.

Express.js React SSE PostgreSQL
Contact for Details
Stable Diffusion Fine-tuning Output
Completed

Fine-Tuning Stable Diffusion

Custom dataset training for personalized image generation. Explored deep learning model fine-tuning techniques.

AI Deep Learning Python
View Presentation
Galaga For Everyone Game
Completed

Galaga For Everyone

Unreal Engine game controlled via smartphone accelerometer using Processing and HTTP requests.

Unreal Engine Processing Android
View on GitHub

Get In Touch

Looking to build backend systems, cloud infrastructure, or scalable APIs? Let's connect.

Email

jc_chaparro@hotmail.com

LinkedIn

José Chaparro

GitHub

JoseCarlosChaparro

Resume / CV

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