Hi, I'm Adam Zieliński, a Senior Data Engineer based in Gdańsk, Poland, with 8+ years of hands-on experience delivering reliable data platforms, operational reporting systems, and high-volume data processing solutions across consulting, analytics, and engineering-led organizations. I'm known for my attention to detail, disciplined execution, and the ability to handle large volumes of structured and semi-structured information while maintaining data integrity and confidentiality.

Adam Zieliński

Hi, I'm Adam Zieliński, a Senior Data Engineer based in Gdańsk, Poland, with 8+ years of hands-on experience delivering reliable data platforms, operational reporting systems, and high-volume data processing solutions across consulting, analytics, and engineering-led organizations. I'm known for my attention to detail, disciplined execution, and the ability to handle large volumes of structured and semi-structured information while maintaining data integrity and confidentiality.

Available to hire

Hi, I’m Adam Zieliński, a Senior Data Engineer based in Gdańsk, Poland, with 8+ years of hands-on experience delivering reliable data platforms, operational reporting systems, and high-volume data processing solutions across consulting, analytics, and engineering-led organizations.

I’m known for my attention to detail, disciplined execution, and the ability to handle large volumes of structured and semi-structured information while maintaining data integrity and confidentiality.

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Experience Level

Expert
Expert
Expert
Expert
Expert

Work Experience

Senior Software Engineer at Billigence
August 2, 2024 - October 2, 2025
Led a data operations project focused on accurate ingestion and standardization of high-volume business records from invoices, forms, and operational systems into centralized databases. Engineered structured data entry workflows using SQL and transformation logic to reduce manual errors and ensure consistent formatting across datasets. Reviewed and corrected incoming data with predefined data quality rules, improving record accuracy by approximately 35%. Automated routine data updates and reconciliation tasks, reducing processing time for daily operations. Maintained large-scale digital records to support downstream reporting, analytics, and audit requirements. Collaborated with finance and operations stakeholders to clarify data requirements and resolve inconsistencies. Implemented controlled access and handling procedures for confidential business data, ensuring compliance with internal data protection standards. Supported ad-hoc data extraction requests by preparing clean data sets
Software Engineer at Audacia
March 2, 2020 - August 2, 2024
Designed and delivered a business intelligence solution centered on clean, well-organized operational data for executive and departmental reporting. Collected and verified data from multiple business sources, ensuring completeness and consistency before loading into analytics systems. Developed SQL-based transformations to standardize raw inputs such as transactional logs, spreadsheets, and third-party extracts. Performed regular data audits to identify inaccuracies, duplicates, and formatting issues, improving trust in reported KPIs. Built interactive dashboards relying on accurately maintained data sets, enabling faster operational decision-making. Automated scheduled data refreshes and routine update tasks, reducing manual intervention and reporting delays. Documented data definitions, refresh logic, and validation steps to support long-term maintainability. Collaborated with finance and operations stakeholders to clarify data requirements and resolve inconsistencies.
Senior Software Engineer at Headquarters
September 2, 2017 - July 2, 2018
Worked on early-stage data pipelines focused on collecting and organizing operational data from multiple internal sources. Performed routine data checks to ensure accuracy and completeness before downstream processing. Assisted in maintaining structured data sets used for internal analytics and reporting. Learned and applied best practices around data consistency, documentation, and controlled updates.

Education

B.Sc. Computer Science at University of Warsaw
August 2, 2013 - August 2, 2017

Qualifications

Add your qualifications or awards here.

Industry Experience

Software & Internet