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Focused on people, right from the start.

From a small Michigan startup to helping thousands of managed employees, our story is one of growth achieved through service to people — yours and ours.


Big things often start small

Michael Bulgarelli founds CoStaff Services with one fundamental question in mind: “If I were the client, how would I build my service offering?” With a people-focused mindset and company priorities clear, CoStaff sets out to become a leader in Professional Employer Organization (PEO) industry.


Creating a culture of service

CoStaff launches CoStaff Benefit Services, an employee benefit agency servicing its PEO clients, as well as benefits-only clients that work direct to the insurance carriers. This expanded offering helps CoStaff grow rapidly and enables them to offer employee benefits-only services in addition to comprehensive HR services.


Empowering clients & their teams

Building onto their existing suite of best-in-class services and products, CoStaff adds a state-of-the-art HRIS platform in PrismHR for clients, extending through volume purchasing power their ability to attract and retain top talent with Fortune-500 benefits offerings through BlueCross BlueShield, Blue Care Network, Unum, Captrust, Omega Benefit Strategies and other elite institutions.


Looking to the future

With a philosophy of never resting on their laurels and always putting clients’ interests ahead of short-term profit motives, CoStaff today is one of the largest and best regarded PEO organizations in Michigan and the Midwest, proud to serve hundreds of clients and their thousands of managed — and deeply valued — employees.


We seek to simplify employment for the modern workforce and set a new standard for the human resources industry by doing right by people, building relationships on trust not transactions, and delivering a level of service we, ourselves, would expect from an HR partner.









Your success starts with your people. Our success depends on yours.

Your success starts with your people. Our success depends on yours.

Discover what working with a full-service HR partner can do for your team and your business.

CoStaff works differently than other outsourced human resources solutions. By prioritizing your unique needs and goals, we become an extension of your team — not separate from it — working tirelessly to support your success. From strategic workforce planning to talent acquisition, employee development, and beyond, your CoStaff team provides a comprehensive range of services tailored to your organization. With deep expertise and industry knowledge, we navigate complex HR challenges on your behalf, allowing you to focus on core business functions.

Our client-first approach ensures your specific requirements are met, fostering a strong partnership built on trust, collaboration, and shared objectives.


Have some questions? Ready to get started?

Reach out to us today. We’re always here to help.


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