Seeking a Senior HR Business Partner to provide comprehensive HR support across multiple companies, focusing on employee relations, performance management, and compliance. The role involves leading investigations, advising leaders, developing performance improvement plans, and ensuring a positive employee experience. Responsibilities include managing onboarding, policies, and legal compliance, analyzing HR metrics, and supporting training programs. Candidates need at least six years of HR experience, with three in a consultative role, and knowledge of federal and state labor laws. Preferred experience includes government contracting, union workforce, and HRIS systems. The position is based in Chantilly, VA, with a hybrid schedule, reporting to the HR Manager. The organization values collaboration, fairness, and cultural integrity, offering comprehensive benefits and equal opportunity employment.