Kristyna Kowalski

Overview

Based in Kraków. I lead fraud detection at Feedzai. Built the trust & safety models now used in 10 product decisions a quarter. Taught SQL to 74 non-analysts. Most at home with anomaly detection and LightGBM. I write a small newsletter about fraud detection.

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Experience

1. Director of Data Science

   Sep 2022 - Present
   Feedzai · 4 yr 1 mo · Full-time · Kraków, Poland
   • Taught SQL to 101 non-analysts.
   • Caught $3 million of fraud in the first year of the new models.
2. Data Scientist

   Feb 2020 - Jul 2022
   SAP · 2 yr 5 mo · Full-time · Kraków, Poland
   • Caught $6 million of fraud in the first year of the new models.
   • Wrote the metric definitions the leadership team reviews every week.
3. Data Analyst

   May 2016 - Feb 2020
   Cabify · 3 yr 9 mo · Full-time · Kraków, Poland
   • Cut false positives on payment blocks by 35%.
   • Taught SQL to 121 non-analysts.
4. Data Analyst

   Dec 2013 - May 2016
   TotalEnergies · 2 yr 5 mo · Full-time · Kraków, Poland
   • Cut false positives on payment blocks by 21%.
   • Taught SQL to 86 non-analysts.

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Education

1. Sorbonne University

   Licence, Operations Research
   2010 - 2013