West Valley Staffing Group | 30,076 followers on LinkedIn. Celebrating 57 Years of Staffing Excellence | West Valley Staffing Group brings over 55 years of experience managing and staffing contingent workforce programs of every size, scope, and complexity. We have redefined Staffing by providing comprehensive solutions through specialization – four companies to be exact! West Valley Engineering - Technical Specialists Prostar Staffing Service - Administrative Specialists West Valley Technology - IT + Software Specialists Accountants Now!