
Li XU
Senior AI & Data Engineer | Full Stack
Salary / Daily rate
Paris, France
Mobility: Paris
Freelance, open to permanent contract
Can come onsite
Skills
Languages
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