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Wojtek Koscik, Senior Data Scientist

Wojtek Koscik

Senior Data Scientist·Auctane

Poland

High school or equivalent, Biotechnology

Work experience

Total years of experience: 8 years, 8 months

Senior Data Scientist

December 2024 - Present

Auctane

Zielona Gora, Poland •Remote

December 2024 - Present

• Creation of anti-fraud predictive models
• Validation and improvement of anti fraud rules
• Close collaboration with business departments with the aim of making company decisions
more data-driven
• Creation of first two ML fraud models in the company:
○ Fraud model for new customers
○ Fraud model detecting potential account takeover
• BigQuery, Python, GCP, git
Company industry:
Internet & E-commerce

Senior Anti-Fraud Analyst

January 2023 - January 2024

Ramp

Warsaw, Poland •Remote

January 2023 - January 2024

• Manual processes automatization by implementing first ML models in the company, with daily
re-training in order to increase models power
• Creation of anti-fraud prediction models
• Implementation of new anti fraud rules
• Improvement and supervision of existing anti fraud rules
• Partnership with business by implementing their suggestions as well as with own initiative, in order
to make company-wide decisions more data-driven
• Expanding economics model by addition of fraud-related costs to overall money flow
• BigQuery, Python, GCP, tableau, omni
Company industry:
Civil Engineering

Data Science Consultant

November 2019 - December 2023

Ignited S.A.

Wroclaw, Poland •Hybrid

November 2019 - December 2023

• Working with various Ignited S.A. clients as an external contractor
• Supporting Ignited S.A. Projects in field of Data Science, ETL, dashboards, reporting
• R, R Shiny, SQL, spark-SQL
Company industry:
IT Services

Lead Data Scientist

January 2022 - January 2023

Nielsen Media

Warsaw, Poland •Remote

January 2022 - January 2023

• Quality checks for production TV viewership data
• Statistical calculations regarding demographic information for Polish population
• Ongoing scenario testing for TV viewership
• Testing/introducing new viewership information (for example: additive advertisement measurement
for TV and online campaigns for Poland)
Company industry:
IT Services

Data Science Consultant

January 2021 - December 2022

Credit Suisse

Wroclaw, Poland •Remote

January 2021 - December 2022

• Project aimed at finding data consistency between source systems and final data system
• After finding (in)consistencies the project moved to the phase of creating an intermediary system
which will orchestrate data flow between banks systems
• SQL (Oracle), Python
Company industry:
Banking

Data Science Consultant

January 2020 - January 2021

HSBC

Krakow, Poland •Remote

January 2020 - January 2021

Financial Crime Threat Mitigation department, Outlier team
• Working on fraud detection classification problem from perspective of money laundering
• Data analysis from perspective of model usability
• Working on new models creation to improve financial crime detection
• Analyzing models output consistency
• A/B testing for new features
• Technologies: python (pandas, matplotlib, sklearn, numpy), SQL, BigQuery, JupyterLab, GCP (Google
Cloud Platform), Jira
Company industry:
Banking

Credit Risk Analyst

November 2019 - January 2020

Takto Finanse

Wroclaw, Poland

November 2019 - January 2020

• Analytics for upgrading Credit Risk Policies
• Researching cohorts of clients, which bring higher risk of default than acceptable threshold
• Querying and analyzing data from external and internal data sources stored in xml/json or table
format in MSSQL Database
• Automatization of a loan process
• Technologies: MSSQL, R, Python, Excel
Company industry:
Financial Services

Artificial Intelligence Analyst

January 2017 - October 2019

Infosys Consulting

Wroclaw, Poland

January 2017 - October 2019

• Developing R and Python based prototypes;
• Working with Agile and Scrum;
• Developing prototypes based on ML, NLP and Advanced Analytics;
• Identifying and proposing Artificial intelligence opportunities in customer business (Consulting,
Pharma, Banking, Production, Automotive, Retail)
• Acting as an Agile Project Lead, by documenting and translating requirements to both IT and sales
teams;
Company industry:
IT Services

Jr. Data Science Specialist

January 2017 - January 2017

BZ WBK SA (Currently Santander Bank Polska)

Wroclaw, Poland

January 2017 - January 2017

• Supporting Business and Credit Risk teams with analysis of credit risk of an individual client in order
to modify companys credit risk policies;
• Analysis were completed and visualized using R (with additional visualization packages) and SQL;
Company industry:
Banking

Education

KU Leuven

January 2014

January 2014

High school or equivalent, Biotechnology

Belgium

Wrocław University of Life and Environmental Sciences

January 2013

January 2013

Bachelor's degree, Biotechnology

Poland

Skills

AUTOMATION

Expert

ANALYTICAL SKILLS

Expert

Anti fraud

Expert

DATA SCIENCE

Expert

ECONOMICS

Intermediate

FRAUD INVESTIGATION

Expert

GOOD CLINICAL PRACTICES GCP

Intermediate

INFORMATION VISUALIZATION

Intermediate

PYTHON PROGRAMMING LANGUAGE

Intermediate

STATISTICS

Expert

Fraud Analysis

Expert

fintech

Intermediate

Artificial Intelligence

Expert

Anti Money Laundering

Intermediate

aml

Expert

data analytics

Expert

Machine Learning

Expert

cryptocurrencies

Intermediate

Languages

Polish

Native Speaker

English

Expert

Arabic

Beginner

Training and Certifications

Certifications
IELTS certification