PATCA PATCA, the Professional and Technical Consultants Association, is a non-profit organization created in 1975 specifically to help connect businesses and independent consultants. PATCA provides clients with an unparalleled network of outstanding professional and technical consultants, at no cost to client businesses. IEEE CNSV IEEE-CNSV, the Silicon Valley chapter of the IEEE Consultants' Network, brings together consultants, clients and interested parties to exchange ideas about electrical, electronic and software engineering IEEE The world's leading professional association for the advancement of technology. LinkedIn Professional Networking.