Joël Hamilcaro, Data Scientist & Full-Stack Engineer

Co-founder of Gros Gradient

Joël Hamilcaro

Data Scientist & Full-Stack Engineer

A few facts

  • Inventor of a patented AI for aeronautics
  • 2nd place worldwide, NLP · Orange Silicon Valley
  • Automation of hospital monitoring for the Paris 2024 Olympics
  • Dual master's in mathematics and computer science

I prototype and ship AI engines, data pipelines and web interfaces for teams that need a reliable result, fast.

Get in touchSee the work

What I deliver

From scoping to production: AI and data systems ready to use, without technical friction.

AI engines

Semantic matching, RAG, scoring and automation models, from prototype through to production.

Data & scoring

Time series, prediction, data pipelines and dashboards your teams can actually use.

Web interfaces & sites

Web interfaces, static or administrable sites (WordPress or equivalent CMS), FastAPI backends, Docker and Kubernetes. SEO, performance and accessibility.

Selected work

A few missions

Gros Gradient

Co-founder · Data Scientist & Full-Stack · 2025 – Present

Micro-agency specialised in AI, data science and software engineering. We design, architect and ship AI engines, data tools and web interfaces, from scoping to turnkey delivery.

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Gros Gradient work & products

  • OSMOZ-IT: semantic matching

    20 Jun 2025

    Design and deployment of a semantic matching solution to identify TV series episodes. OpenSearch, multilingual embeddings, REST API and turnkey delivery with a comparative model benchmark.

    NLP · Semantic search · OpenSearch · Vector search · Multilingual

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  • Colandix

    5 Jul 2026

    Open-source Python library. LLM I/O sanitisation. Aligned with ANSSI guidance (PA-102) for secure exchanges with language models.

    LLM · PII · Security · ANSSI · Python

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  • Administrable sites for sports associations

    1 Sep 2025

    Modern, administrable sites for sports associations, in the same spirit as WordPress or equivalent CMS solutions: self-serve content management, responsive, SEO, performance and accessibility optimized. Built with Next.js.

    Next.js · Web · Administrable · Responsive · SEO · Accessibility

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  • Showcase sites for local trades and services

    2025

    Sites built around getting in touch (phone, WhatsApp), with services, pricing and coverage area. Designed for local search and a simple quote request.

    Next.js · Web · Local SEO · Lead capture

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AP-HP

Data Scientist · Medical & Public Health · 2023 – 2025

Predictive hospital capacity analysis (time series). Scoring models for post-Covid follow-up and Paris 2024 Olympics hospital activity. Generative AI for ICD-10 medical coding. Relational architectures and PMSI data pipelines.

Transformers · PyTorch · TensorFlow · spaCy · Spark · Pandas · PostgreSQL · CI/CD

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Safran Aircraft Engines

Data Scientist · Villaroche · Apr. – Sept. 2022

Data science for aircraft engine maintenance. Design of a patented AI for process optimization.

Python · Optimization · Modeling · Simulations

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Orange Silicon Valley

International NLP competition · 2023

2nd place in an international NLP competition at Orange Silicon Valley (California). Associated publication on ACL Anthology.

NLP · Deep Learning · Research

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Journey

Experience, education and commitment.

Experience

  1. 2025 – Present

    Co-founder of Gros Gradient · Data Scientist & Full-Stack Engineer

    Paris

    At Gros Gradient: Osmoz-IT semantic matching, Colandix (LLM I/O sanitisation / ANSSI), administrable sites for sports associations and showcase sites for local trades and services.

  2. 2023 – 2025

    Data Scientist · Medical & Public Health

    AP-HP Headquarters · Paris

    Hospital capacity, post-Covid and Paris 2024 scoring, generative AI for ICD-10, PMSI pipelines.

  3. Apr. – Sept. 2022

    Data Scientist

    Safran Aircraft Engines · Villaroche

    Predictive engine maintenance. Patented AI for process optimization.

Education

  • 2020 – 2022

    Dual Master's Maths & CS · Data Science

    Université Paris-Cité · High Honors

  • 2017 – 2020

    Dual Bachelor's Mathematics & Computer Science

    Université Paris-Cité

Community commitments

Federal karate instructor, 2nd Dan Shotokan (FFKDA)

  • Classes for kids, teens, adults and babies
  • National coach
  • Black belt exam jury

Skills

The stack I use to ship to production.

Machine Learning & AI

  • Machine Learning
  • Deep Learning
  • NLP
  • Computer Vision
  • Time Series
  • Risk Scoring
  • Generative AI
  • Anomaly Detection

Databases & data

  • SQL
  • PostgreSQL
  • MySQL
  • NoSQL
  • Spark
  • Pandas
  • ER modeling
  • Pipelines

Languages

  • Python
  • TypeScript
  • JavaScript
  • R
  • Java
  • C++
  • SQL

Tools & production

  • Next.js
  • React
  • FastAPI
  • Docker
  • Kubernetes
  • Git
  • GCP
  • Azure ML
  • Airflow
  • MLflow
  • Databricks
  • CI/CD

Let's work together

Need a POC industrialized, an AI engine scoped, an interface shipped to production, or a site built? Write to me. I reply quickly.

Email JoëlVisit Gros Gradient