Radomil Siegel, Developer in Olomouc, Olomouc Region, Czech Republic
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Radomil Siegel

Verified Expert  in Engineering

Business Intelligence (BI) Developer

Olomouc, Olomouc Region, Czech Republic
Toptal Member Since
November 22, 2023

Radomil is a business intelligence (BI) solution expert with 17 years of BI experience. He specializes in Teradata- and Oracle-based data warehouse solutions and IBM Cognos and Power BI reporting. He performs business analysis, with direct contact with business users, and handles Cognos administration and report or dashboard development. Radomil has also delivered projects in data analysis, semantic layer development, metadata management, and data security management at row and column levels.



Preferred Environment

Windows 11, Cognos 10, Microsoft Edge, Microsoft Power BI, Oracle Instant Client

The most amazing...

...project I've delivered is a data security implementation in IBM Cognos, ensuring the report output is filtered according to the user's security group.

Work Experience

BI Solution Expert

2014 - 2022
Oriflame Software S.R.O.
  • Analyzed business requirements, defined database steps when data was unavailable, prepared data models for reporting, and developed required reports in Cognos or Power BI.
  • Specified data quality rules and fixed issues as a level 3 support as needed.
  • Supported Cognos administration, handling issues such as failed schedulers or removed TMP files.
Technologies: IBM Cognos, Oracle, Business Analysis, Microsoft Power BI, Microsoft Excel, Dashboards

Product Quality Reports

A set of reports to inform and support the quality team in deciding which products are the best or worst in our portfolio.

As a front-end developer, I worked with the business to produce the reports. We prepared KPIs for measuring quality and defined the perspective for monitoring data, such as the percent of claimed or ordered quantity involving claims due to quality reasons.

Power BI Pilot

A Power BI pilot project that I worked on as a front-end developer to show the business that all their requirements could be implemented. We focused on security:

• Row level: Filtering data in the proper report depending on the logged user.
• Column level: Deciding what columns can be visible or invisible in the same report depending on the logged user.
1987 - 1992

Master's Degree in Mathematics and Computer Science

Palacky University Olomouc - Olomouc, Czech Republic


IBM Cognos 8 BI Administrator



IBM Cognos 8 BI Author



Teradata Certified Professional V2R5



IBM Cognos, Microsoft Excel, Microsoft Power BI






Oracle, Microsoft Edge


Cognos 10, Dashboards, Data Visualization, Oracle Instant Client, Business Analysis, DAX, Computer Science, Teradata Studio, Windows 11

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