Yann Defretin
Staff Engineer at SAHAR
Paris, Ile-de-France
Summary
👤
Senior🎓
Top SchoolYann Defretin is a Staff Engineer based in Paris with 11 years of experience building AI-driven cybersecurity and data solutions, currently leading technical efforts at SAHAR. He blends deep ML and deep learning expertise (from sklearn/XGBoost to Transformers and YOLO) with solid DevOps and software engineering skills—shipping production pipelines using Docker, GitLab CI/CD and MLflow. Before SAHAR he designed end-to-end AI systems for threat intelligence at Orange Cyberdefense, improving detection performance for international clients. His background in cinema and sound engineering informs a creative, systems-level approach to problem solving and communication across cross-disciplinary teams. An active open-source contributor, he has hardened popular PHP tooling like the twitteroauth library by improving retry resilience and stability.
11 years of coding experience
6 years of employment as a software developer
Master of Arts - MA Cinema, Master of Arts - MA Cinema at University of Paris I: Panthéon-SorbonneBachelor of Applied Foreign Languages English, Bachelor of Applied Foreign Languages English at Université de Picardie Jules Verne (Amiens)Data AI Developer Artificial Intelligence, Data AI Developer Artificial Intelligence at Simplon.coHigh School Diploma Sciences, High School Diploma Sciences at UFA Lycée CASSINISound Engineer Sound & Cinema, Sound Engineer Sound & Cinema at ESRATOEFL TOEIC Cambridge class Second Language Studies, TOEFL TOEIC Cambridge class Second Language Studies at GV English Centres
French, English, Spanish
Github Skills (7)
php-library10
error-handling10
php10
api10
apidoc10
twitter-api10
refactoring9
Programming languages (24)
Github contributions (5)
abraham/twitteroauth
Jul 2017 - Aug 2017
The most popular PHP library for use with the Twitter OAuth REST API.
Role in this project:
Back-end Developer
Back-end DeveloperContributions:9 commits, 2 PRs, 6 comments in 6 days
Contributions summary:Yann focused on improving the reliability and stability of the Twitter OAuth library. Their contributions include implementing retry mechanisms for server errors, resetting the attempt counter, and refactoring the retry logic. They also corrected minor typos and updated configuration-related comments within the codebase. These changes aim to improve the resilience and robustness of the library when interacting with the Twitter API.
twitteroauthapiphptwitter-apirest
kinoute/textract
Feb 2022 - Jan 2025
extract text from any document. no muss. no fuss.
Contributions:4 PRs, 6 pushes in 2 years 11 months
nlpextractionpythonextract-textnatural-language-processing
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