Client Support Administrator
Company: Mercer
Role summary
Client Support Administrator is a role at Mercer in Phoenix, Arizona, United States (hybrid). Posted 2026-08-16. Experience level: 5-10.
- Job title
- Client Support Administrator
- Company
- Mercer
- Location
- Phoenix, Arizona, United States
- Work arrangement
- hybrid
- Category
- Administrative
- Experience level
- 5-10
- Date posted
- 2026-08-16
Job description
We are seeking a talented individual to join our GHSC Operations Client Support team at Mercer, a Marsh business . This role will be based in Phoenix and offers a hybrid work arrangement, requiring a minimum of three days per week in the office.
As a Client Support Administrator, you will play a key role in keeping the team organized, efficient, and client-focused by managing a variety of administrative, project, and operational responsibilities. This position offers the opportunity to collaborate closely with senior leaders while producing polished, high-quality documents, coordinating client invoicing, and ensuring projects stay on track through strong attention to detail and sound judgment. Success in this role comes from balancing multiple priorities, handling confidential information with professionalism, and proactively supporting a seamless team workflow in a fast-paced, collaborative environment.
We will count on you to:
Complete monthly client invoicing
Establish, maintain, and manage client subject files, personal working files, and legal plan documents as applicable
Thrive and be motivated by an environment that embraces AI and technology-enabled tools
Provide peer review of documents before final production/distribution to ensure quality control of the final product
Ensure all documents produced adhere to Mercer's global identity/document standards
Contribute to accurate client/project budget management through accurate and prompt time entry
Handle sensitive information with professionalism and integrity while communicating openly and often among team members
Frequently interact and collaborate with senior-level leadership while performing tasks under limited supervision
Assist team with a variety of tasks as assigned
What you need to have:
HS Diploma or equivalent
5+ years of administrative support experience, preferably in a consulting environment or professional service industry
Advanced computer skills, including extensive experience with Microsoft Office (Outlook, Word, Excel, PowerPoint)
Strong judgment, discretion, confidentiality, and decision-making skills with the ability to interact with all levels within the organization
Capability to work well under pressure and with limited direction while handling multiple tasks and prioritizing effectively
Exceptional interpersonal, organizational, business communication, and time management skills.
Strong attention to detail
Demonstrated problem solving capabilities
What makes you stand out?
Bachelor’s Degree
Strong project management skills
Excellent oral and written communication skills
Ability to adapt quickly to business needs and priorities
Previous billing/invoicing experience
Why join our team:
We help you be your best through professional development opportunities, interesting work and supportive leaders.
We foster a vibrant and inclusive culture where you can work with talented colleagues to create new solutions and have an impact on colleagues, clients, and communities.
Our scale enables us to provide a range of career opportunities, as well as benefits and rewards to enhance your well-being.
Mercer is a business of Marsh (NYSE: MRSH), a global leader in risk, reinsurance and capital, people and investments, and management consulting, advising clients in 130 countries. With annual revenue of over $27 billion and more than 95,000 colleagues, Marsh helps build the confidence to thrive through the power of perspective. For more information about Mercer, visit mercer.com, or follow us on LinkedIn and X.
Marsh is committed to embracing a diverse, inclusive and flexible work environment. We aim to attract and retain the best people and embrace diversity of age background, disability, ethnic origin, family duties, gender orientation or expression, marital status, nationality, parental status, personal or social status, political affiliation, race, religion and beliefs, sex/gender, sexual orientation or expression, skin color, veteran status (including protected veterans), or any other characteristic protected by applicable law. If you have a need that requires accommodation, please let us know by contacting reasonableaccommodations@marsh.com.
Marsh is committed to hybrid work, which includes the flexibility of working remotely and the collaboration, connections and professional development benefits of working together in the office. All Marsh colleagues are expected to be in their local office or working onsite with clients at least three days per week. Office-based teams will identify at least one “anchor day” per week on which their full team will be together in person.