Bihara Dissanayake

Built finance and social performance Power BI dashboards using custom DAX measures to deliver clear, self-service KPIs. Developed per-region demand forecasting models in Databricks using Prophet with a custom holiday calendar, tuned with Hyperopt and validated with cross-validated SMAPE. Applied time-series decomposition and k-means retailer segmentation to identify drivers of flat sales volumes and select pilot markets; documented the forecasting methodology and presented results to senior management.