Power BI Developer

Senior Power BI Developer (Tableau Experience Mandatory)Location: Philadelphia, PATax Term: W2 / C2CJob Type: ContractDuration: Long-Term ContractJob Description:We are seeking a Senior Power BI Developer with strong hands-on experience in Power BI and Tableau to design, develop, and maintain reporting solutions for operational and executive audiences. The candidate must have a minimum of 5+ years of recent Tableau experience. The ideal candidate will have strong SQL skills, experience integrating multiple data sources, data normalization and transformation experience using Python or similar scripting languages, and a strong understanding of data visualization and dashboard design best practices.Minimum 5+ years of recent experience in Tableau is mandatory.Roles & ResponsibilitiesDesign, develop, and maintain reports and dashboards in Tableau and Power BI for operational and executive audiences.Write and optimize complex SQL queries for data extraction, aggregation, joins across large datasets, and performance tuning.Connect and integrate multiple data sources (databases, APIs, flat files, enterprise platforms) into unified reporting datasets.Build and maintain scripted data normalization and transformation pipelines (e.g., Python) to standardize, cleanse, and reconcile data from disparate systems.Aggregate data across domains to produce consistent, reliable metrics and KPIs.Apply data visualization best practices to make complex data intuitive — right chart for the right story, clean layouts, drill-down paths.Partner with business and technology stakeholders to gather reporting requirements and translate them into scalable reporting products.Automate recurring manual reporting processes to improve speed, consistency, and scalability.Validate data quality and investigate discrepancies across source systems; document data lineage and reporting logic.Develop complex SQL queries using joins, aggregations, window functions, and query optimization techniques.Build dashboards and reporting solutions using Tableau and Power BI.Aggregate data and connect multiple data sources into consolidated reporting datasets.Develop script-based data normalization and transformation processes using Python or similar technologies.Apply data visualization principles and dashboard design best practices.Work with stakeholders to translate business questions into reporting requirements.Maintain strong attention to detail and commitment to data accuracy.Required Skills5+ years of recent Tableau experience – MandatoryTableauPower BIStrong SQLComplex SQL QueriesSQL JoinsSQL AggregationsWindow FunctionsSQL Query OptimizationData VisualizationDashboard DevelopmentMultiple Data Source IntegrationData AggregationData NormalizationData TransformationPython or similar scripting languageData Quality ValidationData LineageKPI DevelopmentReporting AutomationBusiness Requirements GatheringQualifications5+ years of recent hands-on experience with Tableau is mandatory.Strong hands-on experience developing dashboards and reports using Tableau and Power BI.Strong SQL development experience with complex joins, aggregations, window functions, and performance tuning.Experience integrating databases, APIs, flat files, and enterprise platforms into consolidated reporting datasets.Experience with Python or similar scripting languages for data normalization and transformation.Strong understanding of data visualization principles and dashboard design.Experience translating business requirements into scalable reporting solutions.Strong data quality, analytical, and problem-solving skills.Excellent attention to detail and commitment to data accuracy.Strong communication and stakeholder collaboration skills.