Login & Support: ADP Vantage HCM® Login. ADP Vantage HCM is a strategically focused, globally scalable HR system that delivers unmatched expertise and service, comprehensive unified services, innovative and intuitive technology, and valuable insights to help unlock your workforce’s maximum potential. The ADP Vantage HCM solution is a smart and powerful system with built-in processes to help you and your staff win at: Talent — Leverage technology and insights to develop a brand story that attracts top talent and inspires new hires from recruiting through onboarding, and connect your talent strategy to your business priorities, including ...