Senior Residential Mechanical Designer, Residential Mechanical Design, Residential HVAC Design, HVAC Engineering, Mechanical Engineering, Residential MEP, HVAC Load Calculations, Manual J, Manual D, Manual S, ACCA, WrightSoft, Wrightdraw, AutoCAD, RESCheck, REM/Rate, Energy Modeling, Energy Efficiency, IECC, ENERGY STAR, Green Building, High-Performance Buildings, Residential Construction, Home Energy Ratings, QA/QC, Mechanical Design, HVAC Design, Fairfax VA, Virginia. As a Senior Residential Mechanical Designer, you will serve as a senior technical resource for residential HVAC design and analysis, taking ownership of load calculations, duct sizing, equipment selection, QA/QC, energy modeling, project coordination, and technical problem-solving.