Can I still use my preferred vendor?

If they are enrolled in the new Managed Services Program, yes.

All vendors and staffing agencies currently providing contingent workers to participating tubs are invited to participate in the program. Once they join the program, they will have the opportunity to submit resumes for job requisitions posted in Fieldglass. The DZConneX PMO will shortlist candidates based on qualifications. Note that this is a vendor neutral selection process and hiring managers will no longer see the name of the supplier on a resume.