HR Generalist – Benefits Focus (PEO)

Company Overview

CoStaff Services delivers high-impact HR, payroll, and benefits solutions to small and mid-sized businesses, empowering our clients to focus on what they do best. As a leader in the PEO and HRO space, we combine deep expertise with a highly personalized service model.

We’re continuing to grow and are looking for a Benefits-focused HR Generalist who thrives in a fast-paced, client-driven environment and takes pride in delivering exceptional service and accuracy.

If you enjoy being the go-to expert, solving complex benefits challenges, and making a meaningful impact for both clients and their employees, this is a great opportunity to join a collaborative team with a strong culture and momentum.

Position Summary

This role is ideal for an HR professional who is passionate about benefits and enjoys working across a diverse client base. Approximately 90% of this role is dedicated to benefits administration, making it a great fit for someone who wants to deepen their expertise and play a critical role in client success.

You’ll partner closely with HR Business Partners, Payroll, and external vendors to deliver a seamless, compliant, and high-quality benefits experience.

Lead Benefits Administration (Primary Focus)

• Own the day-to-day administration of employee benefits, including medical, dental, vision, FSA, HSA, COBRA, and 401(k)
• Lead open enrollment from start to finish, configuration, communication, and employee support
• Conduct monthly billing audits and proactively resolve discrepancies
• Oversee COBRA administration and ensure full regulatory compliance
• Support FMLA and leave tracking as it relates to benefits eligibility
• Serve as a trusted resource for clients and employees, resolving questions with confidence and care
• Partner with carriers, brokers, and vendors to troubleshoot and resolve complex issues
• Maintain accurate and clean benefits data within HRIS systems

Deliver Exceptional Client Experience

• Provide high-touch, responsive support across a multi-client PEO environment
• Interpret and clearly communicate benefits plans, eligibility, and compliance requirements
• Support audits, reporting, and ongoing compliance with federal, state, and local regulations

Collaborate Across Teams

• Partner closely with Payroll to ensure accurate benefit deductions and client billing
• Support onboarding and benefits enrollment processes
• Work cross-functionally to ensure a seamless client and employee experience
• Maintain strong data integrity and documentation within HR systems

Education

• Bachelor’s Degree in Human Resources or related field preferred
• PHR, SHRM-CP, SPHR, or SHRM-SCP certification is a plus

Experience

• 3–7+ years of HR experience with a strong focus on benefits administration
• Experience supporting multiple clients or business units preferred
• PEO, HRO, or broker experience is highly valued

Skills & Qualifications

• Strong knowledge of employee benefits, compliance, and regulations
• Experience with COBRA, open enrollment, billing audits, and leave administration
• Highly detail-oriented with strong organizational skills
• Exceptional customer service mindset; you’re responsive, solutions-oriented, and proactive
• Ability to manage multiple priorities in a fast-paced environment
• Proficiency in HRIS platforms and Microsoft Office (PrismHR experience is a plus)

Why CoStaff?

• Collaborative, team-oriented culture where your contributions matter
• Opportunity to build deep expertise in benefits within a growing PEO environment
• Exposure to a diverse client base across industries
• A company that values service excellence, accountability, and continuous improvement
• Competitive compensation and a comprehensive benefits package

Additional Details

Position Type: Full-Time, Exempt Location: Royal Oak, MI (Remote / Hybrid)

To learn more about CoStaff Services, visit www.costaffservices.com

If you’re ready to take the next step in your HR career and make an impact, we’d love to connect. Please submit your resume along with your salary expectations.