Looking for an experienced mechanical design engineer

Looking for an experienced mechanical design engineer for 2~3 days to create a concept design drawing of the coffee roasting machine. This machine will have multiple components. Must be experience with mechanical drawing of IGS or STEP format drawing and 2D drawing. Please note this is the first design iteration, not the final drawing for manufacturing. We have rough specification for all components for the machine and we will finalise the details specification after research and development.