Senior Human Resources Generalist

Castelion Corporation • Torrance, CA

6d

About The Position

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.

Requirements

• Bachelor's degree in Human Resources, Business, or related field
• 3+ years of HR experience with strong ownership of payroll and benefits
• Experience working in a startup or high-growth environment
• Proficiency with HRIS platforms (e.g., Rippling, ADP, Workday, or similar)
• Strong analytical skills (excel required; dashboards/BI tools a plus)
• High attention to detail and ability to manage sensitive information
• Solid understanding of employment laws and compliance requirements

Nice To Haves

• Experience in aerospace, defense, manufacturing, or other regulated industries
• Familiarity with government compliance environments (e.g., audits, reporting standards)
• Experience building or scaling HR processes from the ground up
• HR certification (PHR, SHRM-CP, or equivalent)
• Payroll certification (CPP or equivalent)

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.
• Ensure timely and accurate payroll tax filings, reconciliations, and reporting across federal, state, and local jurisdictions, meeting all deadlines to avoid penalties.
• Resolve payroll discrepancies and inquiries within 24–48 hours.
• Ensure compliance with multi-state wage and hour laws, tax regulations, and reporting requirements.
• Continuously improve payroll processes to support rapid scaling through automation and system optimization.
• Benefits Administration
• Manage and optimize employee benefits programs (e.g., retirement, leave management, health insurance) to increase employee participation and satisfaction.
• Respond to benefits inquiries within 24 hours with 95% resolution satisfaction.
• Support open enrollment and serve as a trusted resource for employee questions.
• Analyze utilization trends and recommend benefit enhancements.
• People Analytics & HR Systems
• Maintain HRIS integrity and ensure accurate, real-time employee data.
• Translate data into actionable insights for leadership and workforce planning.
• Support compliance reporting and audits with a high degree of accuracy.
• Onboarding
• Ensure Day 1 readiness for all new hires (e.g., new hire documentation, new hire checklist, compliance requirements).
• Maintain 95% new hire satisfaction score on onboarding surveys.
• Track onboarding progress and identify opportunities to enhance efficiency and engagement.
• General HR Operations
• Support onboarding and offboarding with a seamless, high-quality experience.
• Respond to employee inquiries within 24 hours, with 90% first-touch resolution rate.
• Maintain audit-ready employee records with compliance-free deficiencies.
• Ensure completion of offboarding tasks within company standards.
• Identify opportunities to automate, streamline, and strengthen HR processes.

Benefits

• All employees are granted long-term stock incentives as part of their employment as Castelion.
• All employees receive access to comprehensive medical, vision, and dental insurance, and the company offers three weeks of paid time off per year.

What This Job Offers

• Job Type: Full-time
• Career Level: Mid Level