Senior Human Resources Generalist

Job description

About Castelion Castelion is bringing a new approach to defense development and production: one that focuses on short, iterative design cycles, rapid testing in development, and modern commercial manufacturing strategies for production at scale. We're designing, building, and testing next generation long range strike weapons systems to give America and its Allies a definitive edge and deter future conflicts. Senior Human Resources Generalist The Sr. Human Resources Generalist will lay a foundational role in building and optimizing the core people infrastructure that enables our teams to do their best work—on the ground and beyond. You'll design, implement, and continuously improve critical HR systems and processes across onboarding, payroll, benefits administration, and people analytics. Partnering closely with leadership and cross-functional teams, you'll help create scalable, compliant, and employee-centric experiences that support rapid hiring and operational complexity. Responsibilities: Payroll Operations: - Deliver 100% on-time payroll processing with little to no error rate. - Serve as first point of contact for payroll tax inquiries, notices, and agency communications. - En...