Michał Janik
Senior Data Scientist
Lower Silesian Voivodeship, Poland
Summary
👤
Senior🎓
Top SchoolMichał Janik is a Senior Data Scientist with 7 years of experience specializing in machine learning, recommender systems, and large-scale experimentation, currently shaping personalization and search at Allegro. He builds end-to-end ML solutions—from model design through scalable PySpark/BigQuery implementations to production deployment—and architected Allegro’s in-house A/B testing platform used across dozens of teams. His work has driven measurable uplift in GMV via campaign recommenders, improved conversion through category-aware search, and applied reinforcement learning to homepage personalization. Michał combines hands-on engineering with mentorship and product collaboration, and while completing a Master’s in Machine Learning he retains a practical systems focus that bridges research and production.
7 years of coding experience
4 years of employment as a software developer
Engineer's degree Computer Science, Engineer's degree Computer Science at Wrocław University of Science and TechnologyMaster's degree Machine Learning, Master's degree Machine Learning at University of Warsaw
English, Polish
Github Skills (7)
application9
fine-tuning7
llm7
data-structures7
vector-database7
gpt5
editing1
Programming languages (7)
Github contributions (5)
mihal09/3SEM
Nov 2019 - Nov 2019
Contributions:7 commits, 1 PR, 4 pushes in 21 days
Harp0n/PaperRPG-Project
Nov 2019 - Nov 2019
Contributions:27 commits, 8 PRs, 23 pushes in 13 days
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