Sienna ECAD Technologies Private Limited | 5,360 followers on LinkedIn. PCB Design engineering team offering value added services to Electronic product and design companies | SIENNA ECAD is one of India's leading PCB design/analysis engineering company located in Bangalore, India. The parent companies Sienna Corporation and Avalon Technologies are Electronics Manufacturing Services providers based in USA/India with facilities in Atlanta, Fremont, Chennai, Bangalore. SIENNA ECAD's PCB Engineering team works with clients across the globe addressing solutions for highly complex PCB design solutions meeting IPC specifications.