A HEC-RAS job involves using the Hydrologic Engineering Center's River Analysis System (HEC-RAS) software to model water flow, floodplains, and sediment transport in rivers and channels. Professionals in this role analyze hydrological and hydraulic data to support flood risk management, infrastructure design, and environmental impact studies. They typically work for government agencies, engineering firms, or consulting companies specializing in water resources. Strong skills in GIS, fluid mechanics, and data analysis are often required.