Full stack engineer · Backend · Cloud

José Chaparro I build production software, and the infrastructure it runs on.

React and Next.js on the front, Python and .NET behind it, PostgreSQL and AWS underneath. I designed the production platform at Moneta Market and run client products through my studio, Bifrost Code.

  • US citizen — no visa sponsorship needed
  • Open to remote or US relocation
  • Based in Chihuahua, Mexico
  • English B2 · Spanish native
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José Chaparro
  • 1,750+ employees across 170+ branches use the ERP I extended
  • 3 client products I built, live in production
  • 6 services in the production platform I designed at Moneta Market

01 · Selected work

What I've built

Most of this is employer or client work, so the code is private. I'm glad to walk through any of it on a call.

Moneta Market · Computer vision

Grab-and-go cooler vision

In progress

An unattended retail cooler has to know which products each customer takes, with no cashier.

  • Two-stage detection and classification running on an NVIDIA Jetson Orin Nano, optimized with TensorRT FP16.
  • Multi-object tracking at 60 fps, with automatic camera recalibration through SIFT homography.
  • The evaluation harness (leave-one-day-out validation, pre-registered thresholds) that set the production frame-rate and image-format requirements.

NVIDIA Jetson · TensorRT · YOLO · OpenCV

Bifrost Code · Client product

FisioApp

In production

Physiotherapy clinics need one place for patient records, appointments, treatment packages and payments, with each clinic's data kept apart.

  • Multi-tenant Next.js application on PostgreSQL covering clinical records, scheduling, packages and payments.
  • Audited against WCAG 2.1 AA.
  • Self-hosted on the studio's own infrastructure behind Cloudflare Tunnels, with automated off-site backups to Backblaze B2.

Next.js · PostgreSQL · Dokploy · Backblaze B2

Bifrost Code · Client product

Feriu

In production

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

Bifrost Code · Client product

Karaoke Balu

In production

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

Express · React · SSE

Earlier work: Galaga For Everyone, an Unreal Engine game played with a phone's accelerometer, and Stable Diffusion fine-tuning on a custom dataset.

02 · Experience

Where I've worked

August 2025 — Present

Moneta Market LLC

Full Stack Engineer

Designed and built the company's production platform (six services on AWS, the database behind it and an on-device vision pipeline) and led the team's two interns after the lead developer left.

  • Replaced manual deployments with the company's first containerized platform: six services on AWS EC2 (two FastAPI microservices, Label Studio, MLflow, Nginx) brought up reproducibly with Docker Compose.
  • Built an on-device computer-vision pipeline on NVIDIA Jetson Orin Nano that identifies the products a customer takes from a retail cooler, plus the evaluation harness that set its production requirements.
  • Designed the PostgreSQL schema the operation runs on: 25 tables on AWS RDS with 24 foreign keys, 34 indexes, idempotent migrations and a soft-delete audit trail, reachable only through an SSH bastion.
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  • Built an event-driven FastAPI webhook service between Label Studio and S3 that keeps the two consistent when a step fails: atomic rollback across database and S3, async connection pooling, a cache with database fallback. Wrote the runbooks to operate it.
  • Moved the frame-review desktop app off Windows-only WPF to cross-platform C# (.NET 10, Avalonia): MVVM, two-pass verification and a sliding-window prefetch cache.
  • Locked down access with least-privilege IAM, AWS Secrets Manager and LocalStack, so development never touches production credentials; set up the CI pipelines.
  • Built the data pipeline's operator tooling (CLIs, idempotent S3-to-PostgreSQL sync, drift audits) and automated model training in GitLab CI on ephemeral AWS GPU instances, tracked in MLflow.
FastAPIDocker ComposeAWS EC2 / RDS / S3PostgreSQLNginxNVIDIA JetsonTensorRTC# · AvaloniaGitLab CI

February 2025 — Present

Bifrost Code

Side project, alongside my full-time role

Co-founder & Full Stack Engineer

Co-founded a studio that designs, builds and hosts web products for clients; three of them run in production today.

  • Shipped three products that still run for real clients: FisioApp (multi-tenant clinic management, audited against WCAG 2.1 AA), Feriu (multi-tenant shared expenses) and Karaoke Balu (real-time requests over SSE, kiosk mode).
  • Deliver end to end on TypeScript pnpm monorepos: React and Next.js front ends, NestJS and Express APIs, PostgreSQL. Earlier projects shipped on React Native, FastAPI and Django.
  • Host every client app on the studio's own infrastructure as a low-cost alternative to Vercel or AWS: Proxmox and Ubuntu Server, Dokploy and Docker Compose with health checks, Cloudflare Tunnels with no inbound ports open.
Next.jsNestJSReactTypeScriptPostgreSQLProxmoxDokployCloudflare Tunnels

March 2024 — August 2025

Grupo Roga

.NET Software Developer

Kept the ERP of a retail group with 170+ branches running and growing, and designed new modules for it from scratch.

  • Extended the ERP running 170+ branches and used by 1,750+ employees (Mueblería El Pasito, Villarreal Muebles, Dinexpress) across point of sale, multi-branch inventory, pricing and accounts receivable, in .NET Framework.
  • Designed and built from scratch the module that manages field agents visiting customer homes for credit approval, with DevExpress maps plotting assignments and data from a companion Android app.
  • Designed the SQL Server layer behind multi-branch operations (stored procedures for inventory aggregation and pricing, and HTML report emails composed with Chilkat), replacing manual report compilation.
.NET FrameworkVB.NETSQL ServerT-SQLSQL Server AgentChilkatDevExpress

2018 — 2023

Education

BSc Computer Science Engineering

Autonomous University of Chihuahua (UACH) · Degree awarded by academic merit

03 · Toolkit

Technical skills

Languages

PythonJavaScriptTypeScriptC#SQL

Frontend

ReactNext.jsTailwind CSSReact NativeAvalonia (desktop)

Backend

FastAPINestJSDjangoExpress.NET

Databases

PostgreSQLSQL ServerSQLite

Cloud & infrastructure

AWS EC2 / RDS / S3IAMSecrets ManagerDocker ComposeNginxProxmoxCloudflare TunnelsGitHub ActionsGitLab CI/CDLinux

Computer vision & edge

Ultralytics YOLOTensorRTONNXOpenCVNVIDIA Jetson

Architecture & practice

MicroservicesRESTful APIsEvent-drivenMVVMCI/CDGitScrum

04 · Contact

Let's talk

Hiring for a full stack, backend or infrastructure role? I'm a US citizen based in Chihuahua, open to remote work or relocating to the US. Email is the fastest way to reach me.

[email protected]
LinkedIn in/jose-c-chaparro GitHub JoseCarlosChaparro Résumé / CV Download PDF