Rubén Colmenares
Rubén Colmenares

Senior AI Engineer · Mexico City

I build agents
that ship.

Agentic systems & production GenAI at GM Mexico. Martita — a multi-agent WhatsApp assistant — built solo. Don't read a résumé. Ask.

I'm an AI engineer who ships agents into production — and thinks hard about when not to build them at all.

2025 —

I lead the AI engineering practice at GM Mexico, where I’ve shipped LucIA, a hybrid-search RAG co-pilot that cut hallucinations 40% and time-to-insight 60%, and a screen-aware SOP agent that documents processes in real time. I authored the corporate Buy-vs-Build framework now used as the standard lens for new AI initiatives, and I advise the C-suite on where AI actually pays off.

2024 —

On nights and weekends I design, build, and run Martita — a WhatsApp-native, multi-tenant AI assistant for Mexican SMEs. One codebase, fully isolated per business, where Claude reasons over 21 tools to handle messy, multi-intent Spanish the way a human receptionist would.

~7,500 lines, solo, live with paying customers. It’s also my testbed for production agent patterns before they reach GM.

2023 —

Before the AI practice I was a data scientist in pricing & incentives, where I shipped Mexico’s first ML incentive-optimization engine — now the standard tool for allocating monthly pricing budgets across vehicle lines.

2014 —

I started in telecom and distributed systems — core-network engineering at Huawei and network engineering at AT&T across Latin America — before finding my way into data and, eventually, agents.

Along the way: an AI/ML certificate from UC Berkeley Haas, an M.Sc. from Tec de Monterrey, and a B.Sc. in Telecommunications Engineering.

Selected projects

Martita ↗

SOLO · LIVE

WhatsApp-native multi-tenant AI assistant. Agentic backend, 21 tools, cross-session memory, Stripe self-serve onboarding. Paying pilot.

LucIA

GM MEXICO

Hybrid-search RAG co-pilot for GM's commercial teams. −40% hallucinations, −60% time-to-insight.

Incentive engine

ML

Mexico's first ML incentive-optimization engine — price-elasticity models wired into budgeting and forecasting.

Ask Rubén

THIS SITE

The agent answering your questions above — grounded on my own writing, built to show the work rather than describe it.

I talk about AI on IAhora

ES · Español All episodes ↗

↻ Auto-updates from youtube.com/@IAhoraPodcast — newest episodes appear on each rebuild.

Writing

Buy vs. build for LLM applications — a decision framework2026Building Martita solo: production agent patterns that survive real users2026