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Location

Poland

Rate

$30  / per hour

Years of experience

7+

About

As an experienced SQL developer, I specialize in crafting complex queries, stored procedures, and functions, with a strong focus on performance tuning and query optimization in big data environments. My expertise spans all phases of database programming, including data warehousing and ETL processes. Throughout my career, I have successfully implemented numerous projects, ensuring robust customer relations and the seamless execution of database solutions. My technical skill set includes a deep proficiency in technologies such as SQL Server, Snowflake, Python, PowerBI, and Hadoop, among others. Currently, as a SQL Developer at Nordea, I am part of the Environmental, Social, and Governance development team, where I architect, enhance, and optimize multi-terabyte data warehouses. My responsibilities include ETL processes from various sources like Snowflake and Hadoop, developing scalable analytical models, and optimizing queries for large-scale databases. Prior to this, I served as a Senior Implementation Specialist at Mastercard Processing S.A., where I led technically complex processing projects and managed the entire project lifecycle. My background also includes significant experience at Centrum Finansowe S.A., where I developed and optimized the database infrastructure for the debt collection process, ensuring efficient operational workflows and generating critical reports for executive management.

Tech Stack

SQL Server, Confluence, DAX Studio, Git, Hadoop, Jira, Power BI, Python, Snowflake, SQL, Ssis, SSRS

Experience

  • Designed, enhanced, and optimized multi-terabyte data warehouses to support complex analytical needs, ensuring high performance and scalability.
  • Managed ETL (Extract, Transform, Load) processes from diverse data sources, including Snowflake, Hadoop, and SQL Server, to ensure seamless data integration and processing.
  • Specialized in performance tuning and optimization of complex queries in big data environments, improving efficiency and reducing processing times.
  • Spearheaded the execution of technically complex processing implementation projects, managing all phases of the project lifecycle from planning to delivery.
  • Developed and managed sophisticated database infrastructures, particularly in the context of debt collection processes, to enhance operational workflows.
  • Generated detailed reports for executive management, facilitating informed decision-making through precise data analysis and reporting.
  • Developed scalable and tabular analytical models tailored for end-user applications, leveraging tools like PowerBI and DAX for advanced data analysis.

Employment history

SQL Developer, Nordea March 2024 - Present
  • Architected, enhanced, and optimized multi-terabyte data warehouses.
  • Developed ETL processes from various data sources including Snowflake, Hadoop, and SQL Server.
  • Created proprietary, scalable, and tabular analytical models for end-user applications.
  • Performed performance tuning and query optimization for large-scale big data databases.
  • Collaborated with a team of experts on data integration and analytical solutions.
  • Utilized tools like Python, PowerBI, and DAX for advanced data analysis.
Senior Implementation Specialist, Mastercard Processing S.A. September 2023 - March 2024
  • Led the execution of technically complex processing implementation projects.
  • Managed multiple customer implementation projects concurrently.
  • Oversaw all phases of the project lifecycle, ensuring precise and timely delivery.
  • Utilized tools like PL/SQL, Linux, Git, and GitLab for project development and deployment.
SQL Server Developer in IT Department, Centrum Finansowe S.A. June 2017 - August 2023
  • Developed and managed database infrastructure for the debt collection process.
  • Created proprietary solutions to enhance operational workflows.
  • Optimized complex queries and managed MS SQL Server infrastructure.
  • Generated detailed reports for executive management to support decision-making.
  • Utilized tools like SQL Server, SSIS, SSAS, and SSRS for database development and reporting.
Specialist in Valuation and Analysis Department, Centrum Finansowe S.A. November 2016 - June 2017
  • Conducted valuation and analysis of financial data.
  • Supported the IT department with data analysis tasks.
  • Collaborated with other departments to ensure accurate financial reporting.
Office Worker/Senior Office Worker in Retail Debt Collection Department, Centrum Finansowe S.A. January 2012 - October 2016
  • Assisted in the debt collection process through data management and reporting.
  • Supported senior management with administrative tasks related to debt collection.
  • Maintained and updated debt collection databases.

Education history

Uniwersytet Warszawski 2017 - 2018 Postgraduate Studies, Economical data analysis in Microsoft Excel and VBAprogramming language
Szkoła Główna Gospodarstwa Wiejskiego w Warszawie 2015 - 2016 Postgraduate Studies, Information Systems and Data Analysis
Szkoła Główna Gospodarstwa Wiejskiego w Warszawie 2010 - 2012 Masters studies, economics
Szkoła Główna Gospodarstwa Wiejskiego w Warszawie 2006 -2010 Bachelor studies, economics
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