Senior Principal Data Scientist

• Mar 2023 - Present

Principal Data Scientist

• Mar 2017 - Mar 2023

Member of (earlier) AI R&D (later) Central Analytics team.Focus on: • causal models – design and implementation of methods used in medicine to help running many multiple RCTs (ab-tests) in parallel including: interaction, heterogeneity effect, baseline imbalance correction, stationarity detection, • activity, game difficulty, LTV modelling and implementation– simulations, dynamical models, time-series , statistical models • research: theoretical/numerical to derive the models and validate them• programming: mostly Python / SQL but also R, JAVA• supervision of projects • helping stakeholders making the best decision under circumstances • education – writing regularly internal blog posts popularizing application of statistics (and causal models) in DS work Show less

Senior Data Scientist

• Mar 2015 - Mar 2017

Data Scientist / Data Engineer

• Jan 2013 - Feb 2015

Hadoop, data mining, Luigi, Python, Hive, Data pipeline, users retention, payment data, SPSS Hadoop, data mining, Luigi, Python, Hive, Data pipeline, users retention, payment data, SPSS

Senior Research Analyst

• Jul 2011 - Dec 2012

Outsourced to a New York investment bank; a team member of Multi-Asset Quantitative Group; developing, programing (mainly in MATLAB but also VBA, C++) and backtesting models for risk parameters estimation required by SFA formula (Basel II Supervisory Formula - capital requirements for securitized products) – PD, LGD, EAD, N for a variety of classes of securitized products: ABS backed by student loans (FFELP and PSL), trade receivables, auto loans and credit cards receivables. Preparing and giving trainings in principles of Hadoop technology and big data analysis. Show less

Analyst

• Dec 2009 - Jun 2011

*Research work - algorythmic trading on FOREX market *Calculating and specifying supporting mathematical and financial algorithms *Development of test scenarios *Testing the components of the internal systems *VBA programming: reporting program (around 300 statistical and financial indices); algorithms supporting research, many macros *Market analyses *Analyses of market data and data produced by the internal systems *Financial models development *Analyses of inner-system efficiency Show less

Professor's assistant

• Sep 2007 - Aug 2009

• Solving structure of new materials (X-ray diffraction) • Numerical structure model development (Excel, Statistica, Origin, VBA, C) • Supervising trainees and students preparing for their Bachelor or Master Degree theses • Writing and publishing scientific papers • Attending conferences • Solving structure of new materials (X-ray diffraction) • Numerical structure model development (Excel, Statistica, Origin, VBA, C) • Supervising trainees and students preparing for their Bachelor or Master Degree theses • Writing and publishing scientific papers • Attending conferences

Business Solution Manager

• Oct 2007 - Jul 2009

• Research; preparing documentation concerning Data Mining analyses for Comarch CRM system • Contact Comarch’s clients; presentation of Comarch’s analytical solutions for financial companies • Representing Comarch at Polish and international conferences (as a speaker); writing technical articles • Working with clients on analytical solutions for banking IT systems • Testing Data Mining modules (i.e. 4 types of neural networks) • Working with SPSS, Statistica, Excel (plus VBA macros) Since VII.2008 (informal promotion) – additional responsibilities: • Supervising a three-member team • Designing analytical solutions for the whole family of Comarch CRM systems (rating model, financial calculators, financial reports, tools for staff management (i.e. work scheduler)) Since I.2009 – promotion to Business Development Manager • Managing analytical (banks’ financial statements analysis) and marketing projects (web mining; Web 2.0) • Representing Comarch at conferences; writing news and articles • Developing ROI models and calculators for IT investments (CRM, Contact Center, Internet Banking) Show less

Assistant

• Sep 2006 - Nov 2006

Work at 3 audit projects concerning automotive industry Work at 3 audit projects concerning automotive industry