Stained Wood Patio Roof Design

I need an engineer to create a structural design for a 15ft by 20ft lean to style wooden patio with a metal roof. 15ft out from the house and 20ft long with the 20ft length only having posts at the end... (Budget: $30 - $250 USD, Jobs: 3D Modelling, 3D Rendering, Architectural Engineering, AutoCAD, Building Architecture, Building Design, Civil Engineering, Construction Engineering, Construction Management, Structural Engineering)