Expert ETL Engineer at Self-employed

Led migration of the company’s main data solution from Oracle to Microsoft SQL Server on Azure, ensuring full functional and performance alignment. Designed and implemented ETL processes in Azure Data Factory (ADF), optimizing data flows and reducing processing time. Developed automated procedures to convert float to decimal datatypes, ensuring data accuracy and consistency across systems. Performed cross-engine analysis and debugging (Oracle vs. MS-SQL) to identify and resolve discrepancies in migrated datasets. Acted as technical lead for the LIMS modernization project, integrating legacy ODI architecture into T-SQL Azure using ADF pipelines. Implemented an efficient change data capture mechanism, eliminating redundant date comparisons and reducing daily data processing loads. Provided on-call production support, monitoring nightly ETL runs and ensuring system stability and SLA adherence. Continuously optimized performance, investigating long-running pipelines and applying ADF best

Expert ETL Engineer at ING

Strong expertise in ETL architecture, performance optimization, and data visualization (Cognos & Power BI). Technical lead within the team, overseeing the entire ETL data chain — from ingestion to customer-facing data delivery. Led performance improvements for long-running ETL processes focusing on indexing, partitioning, query optimization and execution plan analysis. Designed and developed complex SQL stored procedures and data transformations with significant impact across teams. Served as part of the ETL Committee at tribe level, guiding architecture decisions and performance standards. Led Cognos integration and backend interface framework to support enterprise reporting, and created Power BI dashboards to monitor data product performance including KPIs on run status, execution times, and error diagnostics.

BI Developer at IONOS

Led the migration of the core FeatureMart solution from SAP IQ to Microsoft SQL Server, ensuring stability, scalability, and compatibility across environments. Designed and implemented delta export mechanisms for large-scale data outputs (~500M rows/day in CSV), driving major performance improvements and data reliability. Acted as Technical Architect for the NGCS project, responsible for overall design — including database architecture, stored procedures, indexing strategy, and execution plans. Served as data owner for key business domains, performing high-impact data alterations to enhance query efficiency and reporting performance. Contributed to Power BI data modeling to support analytics enablement and training initiatives.