Assisting engineers in creating designs and/or developing circuits, processes and operations that assure proper function of product and test equipment per design specifications by working from general block diagrams, rough outlines of basic circuits, oral instructions, schematics, etc; making necessary calculations to obtain or compare data as required. Developing, constructing and testing highly complex components, assemblies, devices, circuits and systems; developing and constructing experimental and prototype devices, models and systems working from very general information; performing repairs and calibrations as necessary.