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Leonardo de Sá
Leonardo Sá
AI Engineer · Production Systems

Engineering AI
that ships.

I build AI systems for teams that answer to regulators. I ship them, I run them, and I stand behind what they output.

Madrid, Spain · from August 2026 · EN / FR / PT / ES

Engineering Trajectory

Where I've worked.

I work on production AI today. Before that: software engineering and a technology degree.

2025 – 2026

AI Solutions Consultant → AI Engineer

KPMG Brazil — Tax Transformation

I joined as an AI solutions consultant and was promoted to AI Engineer. I built AI systems for tax and compliance teams. In that world, every system must keep records of what it did and protect client data — so I build that in from the start.

  • Helped build a legal search engine — Legal and Corporate teams validated 94% of its answers
  • Cut task time by 30–80% on the workflows I automated
  • Trained 1,600+ professionals to use AI in their daily work
2023 – Present

Co-founder & AI Engineer

Revisa Master

Revisa Master reviews academic manuscripts. I co-founded it, and I am its entire engineering department. I built the review platform end to end and I keep it running. I answer for its uptime, its costs and its output quality — there is no one else to escalate to.

  • A review that took an expert six hours now takes fifteen minutes
  • Built the funnels and landing pages behind ~90% revenue growth in one quarter
  • Every AI call is traced in production, so I can see what the system did and why
2021 – 2023

Full Stack Developer

Garden São Paulo

Built the company's digital foundation end-to-end — its first institutional website, CRM integrations, and operational automation for commercial and administrative processes.

  • Developed the company's first institutional website and digital-presence strategy
  • Automated quotation generation and inventory-control workflows
  • Built customer-service automation supporting 120%+ revenue growth in the period
2023 – 2026

Technologist Degree — completed

Faculty of Technology of Praia Grande — Systems Analysis & Development

Full technology degree covering software engineering, systems architecture, databases, and applied AI — completed with a final GPA of 8.8/10. The theoretical foundation under the practical work.

  • Programming logic, data structures, and algorithms
  • Database design, SQL, and systems architecture
  • Web development, APIs, and applied AI
Why the foundation matters

Building production AI is engineering work — not prompting.

A demo is easy. A system that runs every day for a regulated team is hard. The difference is engineering: pipelines that don't break, answers you can audit, and checks that catch the model's mistakes before a client sees them.

That discipline came from practice. I co-founded a platform and I keep it running in production. I built a company's website, CRM integrations and automations, end to end. I finished a systems degree with an 8.8/10 GPA. The AI gets the headlines. The engineering makes it ship.

Where the pattern started

When something interests me, I go all the way in. In linguistics, that meant graduating top of my cohort at the University of São Paulo (9.2/10 GPA) and earning a merit scholarship to Université Lumière Lyon 2 in France. In technology, it means a systems degree finished with an 8.8/10 GPA, a promotion at KPMG, and a peer-reviewed paper on multi-agent architecture — the same architecture I run in production. I changed fields. The standard stayed.

How I work

Four principles I won't compromise on.

Production-first

I architect for the live system, not the demo. The work that survives contact with real users is the work that matters.

Ship to learn

A prototype proves an idea. A running system teaches you what is actually true. So I deploy early and iterate fast.

Multi-agent by default

I split big problems into small agents. Each agent has one job. That makes the system easier to test, debug and explain.

Build for adoption

A system nobody uses is a failed system. I teach the team while I build — not after.

Need someone who ships production AI?

Let's talk.

Building AI that has to work every time? Let's talk.

leonardo@leonardosa.pro

Madrid, Spain · from August 2026 · English / French / Portuguese / Spanish

© 2026 Leonardo Costa de Sá