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Mariusz Błaszczyk

@mariuszbaszczyk

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BI Developer at Lottomart who delivered 30+ Power BI dashboards and semantic models for business teams.

Poland

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What I'm looking for

I'm open to remote roles in Europe.

At Lottomart, I’ve designed and delivered 30+ Power BI dashboards and semantic models, serving stakeholders across marketing, product, and operations. I’ve also built and optimized BigQuery pipelines to reduce scanned data volumes and reporting costs.

At British Council Foundation, I built Power BI dashboards, embedded applications, and analytical tools for international stakeholders. I also designed Azure Synapse Analytics pipelines and automated operational processes with Power Apps and Power Automate.

At Lumen Technologies Poland, I delivered reports and applications for EMEA business teams and designed the On-net Building Usage Dashboard. The dashboard helped teams view the geographic distribution of network infrastructure and was adopted across operational departments.

At Waldi Sp. z o.o., I delivered BI reporting for financial results, cost control, revenue tracking, and bonus calculations. I introduced OLAP cubes and Data Warehouse architecture, and I’m Microsoft Certified: Data Analyst Associate (PL-300).

Experience

Work history, roles, and key accomplishments

Current

BI Developer

Current

Lottomart

Jun 2024 - Present (2 years 5 months)

Designed and delivered 30+ Power BI dashboards and semantic models in PBIP format, serving 50–200 stakeholders. Built and optimized BigQuery pipelines and maintained a Git-based development lifecycle in Bitbucket.

Power BI DAX Power Query Tabular Editor Bravo PBIP RLS BigQuery SQL Git Bitbucket Jira Agile

Current

Data Editor

Current

Electronic Arts

Jan 2012 - Present (14 years 10 months)

Collecting, analysing, and editing Polish Ekstraklasa player data for FIFA / EA FC game titles using the EA Web Tool, in line with milestone schedules and delivery dates.

Data Collection Data Analysis Data Editing EA Web Tool

Power BI Developer

British Council Foundation

Nov 2022 - May 2024 (1 year 6 months)

Built Power BI dashboards, embedded applications, and analytical tools for international stakeholders. Designed Azure Synapse Analytics pipelines and automated operational processes using Power Apps and Power Automate.

Power BI DAX Power Query (M)RLS Azure Synapse Data Lake Storage Gen2 PySpark SQL Server Snowflake PowerApps Power Automate Azure DevOps VSCode Git

Senior Business Applications Analyst

Lumen Technologies Poland

May 2021 - Oct 2022 (1 year 5 months)

Delivered Power BI reports and applications for EMEA business teams, including an On-net Building Usage Dashboard adopted across multiple departments. Administered SharePoint and supported Office 365 workflows.

Power BI DAX Power Query (M)ETL RLS SharePoint Office 365 Oracle SQL Developer SQL Server Management Studio ServiceNow

BI Data Analyst

Waldi Sp. z o.o.

May 2012 - Apr 2021 (8 years 11 months)

Delivered end-to-end BI reporting using Power BI and Oracle BI, covering financial results, cost control, and revenue tracking. Progressed from analyst to lead BI developer over 9 years, introducing OLAP cubes and Data Warehouse architecture.

Power BI Oracle BI OLAP Data Warehouse SQL Financial Reporting Cost Control Revenue Tracking