Li XU

Senior AI & Data Engineer | Full Stack

Salary / Daily rate

Paris, France

Mobility: Paris

Freelance, open to permanent contract

Can come onsite

Skills

PythonFullstack DevelopmentData EngineeringMachine Learning

Languages

Chinese (Native)French (Fluent)English

About me

Intro

AI/ML Engineer with 10+ years full-stack development and 5+ years IA expertise. Je conçois des solutions robustes, de bout en bout : systèmes RAG avec LangChain, modèles de Machine Learning en production, pipelines de données, et applications web ou APIs performantes.

Links

Work experience

AI / ML / Data Engineer

FreelanceFreelance

Oct 2021 - Present

5 years 1 month

Paris, France

Consultant technique accompagnant plusieurs clients dans le déploiement de solutions IA et Data Engineering. PROJET PRINCIPAL : RAG - Support Documentaire Intelligent (Synodis) - Conception d'un système RAG pour interroger la documentation technique. - Pipeline de données : Extraction, nettoyage, chunking et vectorisation. - Intégration hybride : Modèles propriétaires (OpenAI) et modèles Open Source (Llama 3, Mistral) issus de l'écosystème Hugging Face. - Déploiement on-premise conteneurisé via Docker et Ollama. - Orchestration (Airflow) et API de requêtage (FastAPI). Tech : LangChain, LangGraph, Hugging Face, Transformer, Ollama, Chroma, FastAPI, Docker. PROJET ML : Estimation des Prix d'Enchères (FTPROD) - Analyse et nettoyage des données historiques de ventes. - Entraînement et optimisation de modèles Machine Learning (Scikit-learn, LightGBM). - Déploiement du modèle en production via une API REST conteneurisée (Docker). Tech : Python, Pandas, Scikit-learn, LightGBM, FastAPI, Docker. PROJET DATA ENGINEERING : Données de Santé (IPC, AFNOR, AHP, ROFIM) - Développement de pipelines ETL pour l'intégration de données de santé (FHIR/HL7). - Implémentation de protocoles de sécurité pour les données sensibles. - Développement de modules Python avancés intégrés dans InterSystems IRIS. Tech : Python, InterSystems IRIS, ObjectScript, Azure, AWS. PROJET ARCHITECTURE : ERP & Analytique (SAM, Nanni Energy) - Architecture et développement d'un ERP (Django) et de dashboards analytiques. - Conception d'APIs REST (NestJS/FastAPI) pour la gestion des produits et utilisateurs. Tech : Django, NestJS, TypeScript, PostgreSQL, Plotly/Dash.

Data Scientist / Engineer

Modis

Jan 2021 - Oct 2021

10 months

Paris, France

Project on Data Lake of Université Toulouse-III-Paul-Sabatie - Collection and processing of multi-type data from files or streaming - construction of the data lake architecture Technical environment: Python, Scala, Spark, Airflow, OpenStack Swift, InfluxDB, MongoDB, Neo4J, MQTT, Flask, React, Docker Projet on Predictive / proactive of parcel delivery for GeoPost · Exploration, cleaning, pre-processing of raw data · Training, adjustment, evaluation of machine learning models · Preparing environments to train and deploy models. Technical environment: Python, Scala, Spark, Kafka, Cassandra, Kubernetes

Machine Learning Engineer

nCefalon Corporation

Jul 2020 - Dec 2020

6 months

San Jose, CA, USA

- Development of deep neural networks to use brain waves to predict epileptic seizures - Building of an end-to-end machine learning system, including data preprocessing, model training, post-processing, testing and evaluation Technical environment Python, Pytorch, Keras, AWS

Data Scientist

Veepee

Nov 2019 - Jul 2020

9 months

Paris, France

Professional project with Télécom Paris on Price elasticity - Study of how price variation affects sales - Modeling for price optimization and sales forecasting - Application of different models: Random Forest, Catboost, Neural Networks, etc. - Developed a sales simulator based on dynamic pricing. Technical environment Python, GCP, BigQuery, Scikit-learn, Tensorflow/Keras, Plotly/Dash

Lead Full Stack Developer

Orange

Sep 2014 - Aug 2019

5 years

Paris, France

Project on Orange Pro Shop (boutiquepro.orange.fr) - Development and design of new modules and features. - Technical reference: code review, performance optimization, security. Project on Orange Wi-Fi Hotspots shop - Launch and architecture of the project. - Technical support for the team. Technical environment PHP, MySQL, JavaScript/jQuery, Html5/CSS3/Sass, Zend, Symfony, Magento, Bootstrap, XML/JSON, SOAP/REST, Memcached, Apache, Linux (CentOS/Redhat) / Bash, Git, Composer, PHPUnit, Behat, Jenkins, Docker, Vagrant, JMeter, Burp Suite, Redmine, Jira

Pinkstone

May 2010 - May 2014

4 years 1 month

Paris, France

Full Stack Web Developer

Nov 2010 - May 2014

3 years 7 months

Paris, France

- Design and production of e-commerce websites for SMEs (such as: lafitte.fr) - DevOps Technical environment PHP, MySQL, MS SQL Server, JavaScript/jQuery/prototype, Html/css, XML, SOAP, Magento, WordPress, Apache, Linux/Bash, Windows server

Web Developer

May 2010 - Dec 2010

8 months

Paris, France

- Website development Technical environment PHP, MySQL, Magento, JavaScript/jQuery/prototype, Apache, Linux


Education

Télécom Paris

Mastère Spécialisé

2019 - 2020

2 years

Activities and societies: Big Data Engineering AWS/NoSQL - GDELT  - Construction of a distributed, resilient and efficient storage system on AWS - Data preprocessing by Spark - Deployment of MongoDB replica set Technic: EMR (Spark/Zeppelin), EC2 (MongoDB), S3 (Raw csv), Visualization (StreamLit)  Fusion of algorithm for facial recognition IDEMIA - Feature engineering of big and non-balances data - Application of different binary classification algorithms Technic: Pandas, Scikit-learn, LightGBM, Catboost KickStarter Campaigns - Scala programming - Machine learning application with Spark ML Technic: Scala, Spark.ML Anomaly Detection - Airbus - Detect the anomaly of helicopter accelerometer  Technic: Scikit-learn, Keras, AutoEncoder, IsolationForest

SUPINFO

Master's degree

2009 - 2010

2 years

Jiangsu University of Science and Technology

Bachelor's degree

2005 - 2009

5 years

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