Charlie Carreon

I've maintained and evolved Constant Contact's core Rails API service, delivering product features, resolving incidents, and refactoring legacy code. I also built an anomaly-detection and live-error alerting system with Facebook Prophet and Python integrated into Rails.

Previously, I led five data engineers at AB InBev – Grupo Modelo, delivering ETL pipelines with Azure Databricks, SAP integrations, SQL, and HQL. I created an internal Rails tool that automated ETL documentation and transformation work across Vertica, Heroku, and Azure SQL.

At Marketful, I built the core Rails API for an ecommerce platform and integrated Shopify, Amazon, FedEx, UPS, and Estafeta services. I also developed shared shipping logic as a Ruby gem and contributed to Angular and React features.

I'm the founder and CTO of Invitazo, a digital invitations SaaS platform for the Mexican market, where I designed the Rails, Vue.js, PostgreSQL, background-worker, CI/CD, and Cloudflare architecture. I also built a financial operations portal and Flutter mobile app for EFI Soluciones.