Alexandros Karatzoglou
Principal Applied Scientist Senior Science Manager at Amazon
Barcelona, Catalonia, Spain
Summary
👤
Senior🎓
Top SchoolAlexandros Karatzoglou is a Principal Applied Scientist and Senior Science Manager in Barcelona with 12 years of industry experience building production ML and generative AI systems at Amazon and Google DeepMind. He leads teams that develop custom LLMs for recommendation retrieval and curation, applying continual pre-training, supervised fine-tuning and RL to bridge research and large-scale product needs. His career combines deep academic roots (PhD in Machine Learning) with applied leadership at Telefonica Research, where he led interdisciplinary groups and mentored many PhD interns. Alexandros has a long history in recommender systems, bandits, ranking and context-aware models, and has translated those foundations into transformer- and RL-based solutions for YouTube and retail-scale recommenders. He brings rare expertise in taking cutting-edge ML — from kernel methods and online learning to modern LLM pipelines — into production at internet scale. Based in Barcelona and fluent in both research and product priorities, he is known for turning complex research ideas into measurable improvements in personalization systems.
12 years of coding experience
18 years of employment as a software developer
Vienna University of TechnologyErasmus Semester Statistical Physics, Erasmus Semester Statistical Physics at KU LeuvenPhysics, Physics at Aristotle University of Thessaloniki (AUTH)
English, German, Greek, Spanish, Italian
Github Skills (15)
tidymodels10
meta-analysis10
r-package10
cran9
interpretable-machine-learning9
predictive-modeling9
iml9
multilabel-classification9
kernel8
machine-learning6
filtering6
package-repository6
testing5
collaborative-filtering5
python3
Programming languages (1)
Github contributions (5)
cran/kernlab
Oct 2016 - Jun 2022
:exclamation: This is a read-only mirror of the CRAN R package repository. kernlab — Kernel-Based Machine Learning Lab
Contributions:7 commits in 5 years 9 months
kernelcran-rr-packageimltidymodels
alexkz/upf-ml2
May 2016 - May 2016
Contributions:3 pushes, 1 branch in 1 day
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