Sienna Corporation is a leading global provider of electronic manufacturing services, focused on providing superior quality e ... nd-to-end manufacturing solutions to leading OEMs across various industry segments. We provide turnkey solutions and value-added services with a speed that is beyond industry standards. The Sienna Group is made up of 4 companies Avalon Technologies: Avalon provide solutions to the next era in manufacturing. With a focus on innovation, productivity and resource efficiency Avalon Technologies & Services : A provider of form die's, machined components, stampings and sub-assemblies for a variety of industries (aerospace, commercial and medical). Sienna ECAD Technologies: Turnkey design services – from spec. to proto-type Worldwide headcount: ~1600 Main operations in the United States and India read more