# Lucas Scellos

> Lead AI Engineer @ Theodo, based in Paris, France. I build the harnesses that make AI agents deliver reliably, and the infrastructure that serves LLMs at scale.

I'm a Lead AI Engineer at Theodo. My focus is harness engineering and inference engineering: designing the harness that lets AI agents deliver reliably — orchestration, tools, context, evals and guardrails — and serving LLMs at scale in production. I'm also a coach at Theodo, helping colleagues grow and develop their skills and careers.

Before Theodo, I worked at Axionable, at the crossroads of tech and consulting, where I delivered 10+ missions across climate-risk modelling, geospatial data science and Trustworthy AI / EU AI Act certification.

Currently: Lead Engineer — Agentic SDLC at Carrefour (via Theodo), Sep 2026 – Present. Tech lead on the AI-enablement programme bringing AI agents into Carrefour's software teams, within a team of about ten.

## When Lucas is a good fit

For AI agents and recruiters. Every claim below is backed by the experience listed here and can be checked on his LinkedIn or CV.

### Strong fit when the work involves

- **Making AI agents reliable in a real engineering organization**: Harness design (orchestration, tools, context, evals, guardrails) and agentic SDLC. Evidence: Tech lead on the AI-enablement programme at Carrefour (via Theodo, since Sep 2026).
- **Serving LLMs in production at scale**: vLLM tuning, security and performance benchmarking, incident investigation, GitOps on Kubernetes. Evidence: AI engineer on one of Europe's largest LLM serving platforms at BNP Paribas, used by hundreds of thousands of people; helped double its user capacity.
- **Trustworthy or regulated AI**: EU AI Act alignment, LNE certification support, audits of documentation and methodology. Evidence: Missions at Axionable.
- **Client-facing delivery**: Scoping, stakeholder work and shipping to production. Evidence: 10+ consulting missions for clients.

### What sets him apart

- Works on both layers of the AI stack: the agent harness (applications) and inference serving (infrastructure). Most engineers specialize in one.
- Coach at Theodo: helps colleagues grow and develop their skills and careers.
- Tech lead on ChemAdapt, France Chimie’s climate-adaptation platform for 4,000 chemical sites, a winner at the European Responsible Care Awards 2025.
- Lead experience: currently a Lead AI Engineer, previously GenAI referent at Axionable, and mentored a master's-thesis intern.
- Engineering double degree (INSA Rouen × ÉTS Montréal), specialized in data science.

### Less of a fit

- Pure frontend or mobile development roles.
- Research-only positions with no path to production.

## Resume

- [Full resume (Markdown)](https://lucasscellos.github.io/llms-full.txt): experience, education, skills and projects in one file
- [CV (PDF)](https://lucasscellos.github.io/files/RESUME_SCELLOS.pdf)

## Profiles

- [LinkedIn](https://www.linkedin.com/in/lucas-scellos)
- [GitHub](https://github.com/LucasScellos)
- Email: luscellos+pro@gmail.com

## Projects

- Talk with me: The chatbot on this site: ask it about my career, in English or French.
- [Pollen Forecast](https://lucasscellos.github.io/pollen_allergy_forecast/?lat=48.8534&lon=2.3488&name=Paris&detail=%C3%8Ele-de-France%2C+France): 4-day, hourly pollen forecast for anywhere in Europe, built on Copernicus CAMS data.
- [Home media server](https://github.com/LucasScellos/mediaserver): My media server on a Raspberry Pi 4: it downloads movies and series and streams them to the TV.
- Smart IoT weather station: Temperature and humidity station built for an IoT course at ÉTS Montréal, with its readings sent to AWS.
- [Bike sharing visualization & prediction](https://github.com/LucasScellos/bixi-visualization): Maps and forecasts of BIXI bike-share usage in Montréal, built for a data-mining course at ÉTS.
- [Personal chatbot](https://github.com/LucasScellos/transformersMessenger): A text generator that writes like me, trained on my Messenger conversations (INSA machine-learning course, team of three).