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Marcos Javier Alvarez

Senior Full-Stack Engineer · AI/LLM Systems in Production

Senior full-stack engineer specialized in taking AI from demo to production.

About

Senior full-stack engineer specialized in taking AI from demo to production. For the past several years I have built LLM pipelines for document data extraction, communication infrastructure that syncs and classifies email and SMS at scale, and agentic workflows that are tested, cost-traced, and measured like any other engineering system. What I care about most is the gap between an AI demo and an AI system: evaluation harnesses, human-graded ground truth, cost discipline, and observability. Full-stack since 2013 — event-driven backends, React frontends, infrastructure, and DevOps.

Highlights

Recent roles

Senior Full Stack Engineer, House Numbers

Core engineer on a multi-service TypeScript monorepo for an AI-powered mortgage-lending platform, working across backend services, frontend, and infrastructure.

Senior Software Development Engineer, Xogito Group

Main backend engineer on a cloud-based, multi-tenant SaaS for real-time quality-control inspections across factories, product lots, and distribution points.

Senior Software Engineer, FullStack Labs

Full-stack development of a platform supporting a fiduciary purchasing agent for FF&E/OS&E procurement, for a US client.

Selected projects

cowork

Open-source Python CLI that orchestrates multiple AI coding agents into role-based teams, with phase gates, per-role evals and cost reporting.

AI Document Extraction Pipeline

Production LLM pipeline for extracting structured data from documents, with a fallback lane that lifted field accuracy from roughly 0.30 to 0.87 on documents an incumbent OCR vendor could not process at all.

LLM Evaluation Infrastructure

Solo-built evaluation infrastructure for production LLM features — a labeled corpus, human-graded ground truth, LLM-as-judge scoring, per-call cost tracing and version-controlled prompts.

Top skills

  • TypeScript
  • JavaScript
  • Node.js
  • React
  • AWS
  • Docker
  • OpenAI API
  • REST APIs

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Try asking

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  • Has Marcos worked with event-driven architectures? Show me the evidence.
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