Senior Power BI Developer

Aon sp. z o.o.

Senior Power BI Developer

Are you an experienced Power BI professional who can turn complex enterprise data into clear business insights? Would you like to own reporting solutions from requirements gathering through delivery and ongoing support? Join us in our Krakow office with the flexibility to work in a 50/50 hybrid model.

Aon is in the business of better decisions

At Aon, we shape decisions for the better to protect and enrich the lives of people around the world. As an organization, we are united through trust as one inclusive team and we are passionate about helping our colleagues and clients succeed.

What the day will look like

In this role, you will design, develop, and maintain scalable Power BI solutions that help stakeholders understand performance, identify opportunities, and make informed decisions. You will take ownership of reporting solutions throughout their lifecycle, from gathering requirements and translating business questions into technical specifications to delivery, optimization, and ongoing support.

Your responsibilities will include

• Designing and maintaining interactive Power BI reports, dashboards, semantic models, data marts, and reusable reporting assets.
• Developing and optimizing DAX measures, calculated columns, KPIs, Power Query transformations, and enterprise data models using star and snowflake schemas.
• Analyzing large and complex datasets to identify trends, risks, anomalies, and opportunities, while performing root-cause analysis and providing data-driven recommendations.
• Supporting forecasting, scenario analysis, business planning, and the development of meaningful success measures aligned with business objectives.
• Working with SQL, data warehouses, cloud data platforms, and Databricks datasets to access, prepare, transform, and integrate data for Power BI reporting.
• Improving report performance and data efficiency through performance tuning, data optimization, validation, reconciliation, and quality-control techniques.
• Establishing reporting standards, governance principles, and Power BI development best practices.
• Collaborating with business leaders to understand analytical needs and presenting findings to both technical and non-technical audiences.
• Partnering with data engineering teams to improve data pipelines and architecture while ensuring data quality, consistency, and integrity across reporting solutions.

Skills and experience that will lead to success

• A bachelor’s degree in Data Analytics, Computer Science, Information Systems, Mathematics, Statistics, or a related field, together with at least five years of experience developing Power BI solutions in a corporate environment.
• Advanced expertise in Power BI Desktop, Power BI Service, DAX, Power Query (M), SQL, and dimensional data modeling, including star and snowflake schemas.
• Experience working with large-scale enterprise datasets, SQL databases, data warehouses, cloud data platforms, and Databricks data prepared for Power BI reporting.
• Strong analytical and problem-solving capabilities, including the ability to identify trends, conduct root-cause analysis, develop meaningful KPIs, and translate complex data into clear recommendations.
• Excellent stakeholder-management, communication, and data-storytelling skills, with experience presenting insights to technical and non-technical audiences across multiple business functions.
• Additional experience that would be valuable includes:
• Experience with the Azure Data Platform, including Azure SQL, Azure Synapse Analytics, Azure Data Lake, or Microsoft Fabric.
• Knowledge of statistical analysis, forecasting techniques, and scenario analysis.
• Experience using Python or R for advanced analytics.
• Familiarity with data governance, reporting standards, and BI strategy.
• Microsoft Power BI Data Analyst certification, such as PL-300 or an equivalent qualification.
• Experience in financial services, consulting, insurance, or transformation programs.

Please attach CV in English only.

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