Open to opportunities

Rafał Polarski

@rafapolarski

Message

Senior DWH / Data Engineer driving scalable financial data solutions.

Poland

Message

What I'm looking for

I seek senior data-engineering roles in finance where I can build scalable ETL/ELT pipelines, improve regulatory reporting, work with cloud and CI/CD practices, mentor engineers, and contribute to data-quality and performance improvements.

I am a Senior DWH / Data Engineer with over 12 years of experience designing and optimizing ETL/ELT pipelines, regulatory reporting systems, and trading platforms in the financial sector. I specialize in performance tuning, cloud services, CI/CD frameworks and delivering business-critical data solutions.

I have built enterprise-class data warehouses and automated regulatory reporting systems (EMIR, SFTR, BFG), developed counterparty risk engines and counterparty limit applications, and created end-to-end data pipelines using databases, flat files and REST APIs. I collaborate closely with cross-functional teams, support and onboard junior developers, and prepare analyses and reports for senior stakeholders.

Technically, I work with Snowflake, Oracle, SQL Server, Postgres, MongoDB, Python, PySpark, dbt, Airflow, Azure DevOps and major CI/CD tools. I bring deep domain knowledge of derivatives and counterparty risk, practical experience with trading systems, and a strong focus on data quality, scalability and automation.

Experience

Work history, roles, and key accomplishments

Current

Senior DWH / Data Engineer

Current

Aristocrat Interactive

Jan 2025 - Present (8 months)

Developed end-to-end data consolidation platform and ETL pipelines using Snowflake, dbt, Airflow and PySpark; implemented CI/CD with Azure DevOps and onboarded junior developers to improve delivery and data reliability.

Snowflake DBT Airflow Pyspark Azure DevOps ETL CI CD Data Consolidation

Senior Data Engineer

UBS Business Solutions

Jan 2024 - Jan 2025 (1 year)

Built an Early Warning System and maintained portfolio/trading systems, performing database performance tuning and developing ETL/ELT pipelines to support asset management and risk workflows.

ETL SQL Trading Systems Development System Integration Pl SQL Data Pipelines

Senior Software Engineer (ETL Developer)

mBank S.A.

Dec 2021 - Jan 2024 (2 years 1 month)

Developed automated regulatory reporting system and built an enterprise data warehouse with scalable ETL pipelines for EMIR, SFTR and BFG derivative reporting; introduced CI/CD and performance tuning.

ETL Regulatory Reporting DWH CI CD SQL Tuning Oracle

Credit Risk Analyst

National Development Bank (BGK)

Jul 2012 - Jul 2014 (2 years)

Worked in the Credit Risk Department performing risk analyses and contributed to risk-related data processes and reporting to support credit decisioning.

Credit Risk Analysis Credit Risk Reporting Data Analysis Financial Statements SQL

Education

Degrees, certifications, and relevant coursework

Warsaw School of Economics (SGH)

Master of Science, Quantitative Methods in Economics and Information Systems

2011 - 2014

Completed a master's program in Quantitative Methods in Economics and Information Systems, focusing on quantitative analysis and information systems for economics.