Karl Hajjar
Machine Learning Engineer at Nabla
Paris, Ile-de-France
Summary
👤
Senior🎓
Top SchoolKarl Hajjar is a Machine Learning Engineer based in Paris with eight years of experience bridging rigorous applied mathematics and production ML. He holds a PhD from Université Paris-Saclay and has advanced research credentials—including a visiting PhD stay at EPFL and a Microsoft AI internship collaborating on extensions to the Tensor Program for sequential models. Karl has moved ideas from theory to impact across industry roles at Nabla, Zalando and InstaDeep, deploying probabilistic and attention-based systems and applying RL+MCTS to combinatorial optimization challenges. Comfortable both in deep theoretical work on wide neural networks and in shipping production systems, he combines formal training from École normale supérieure and École Polytechnique with hands-on engineering. Outside work he brings a creative perspective shaped by a passion for music, an uncommon thread that often informs his approach to modelling and signal-like data.
8 years of coding experience
2 years of employment as a software developer
Doctor of Philosophy - PhD, Applied Mathematics, Doctor of Philosophy - PhD, Applied Mathematics at Université Paris-SaclayMaster 2 (M2), Mathematics, Machine Learning, Computer Vision, Graduated with Highest Honours (Mention Très Bien), Master 2 (M2), Mathematics, Machine Learning, Computer Vision, Graduated with Highest Honours (Mention Très Bien) at École normale supérieure Paris-SaclayUndergraduate level, Maths, Physics, Undergraduate level, Maths, Physics at Lycée Sainte-GenevièveNavy Officer, Navy Officer at French NavyMaster's degree, Applied Mathematics - Statistics, Machine Learning, Operations Research and Optimisation, Master's degree, Applied Mathematics - Statistics, Machine Learning, Operations Research and Optimisation at École Polytechnique
Github Skills (18)
transformers10
pytorch10
language-model10
python10
machine-learning10
deep-learning10
tensorflow10
bert10
natural-language-processing10
transformer10
speech-recognition10
nlp10
jax10
seq2seq9
flax9
Programming languages (1)
Github contributions (5)
karl-hajjar/wide-networks
Sep 2020 - May 2023
Contributions:181 pushes, 3 branches, 1 issue in 2 years 8 months
karl-hajjar/pop-conic
Jan 2023 - Sep 2023
Contributions:6 pushes, 1 branch in 8 months
Find and Hire Top DevelopersWe’ve analyzed the programming source code of over 60 million software developers on GitHub and scored them by 50,000 skills. Sign-up on Prog,AI to search for software developers.