Office Assistant

Contribute meaningfully at the core of corporate operations for Post Holdings, Inc. We are a Fortune 500® company headquartered in Brentwood, a suburb of St. Louis, Missouri. Our casual professional atmosphere encourages team members to collaborate, innovate, and support our operating companies. With over 100 years of heritage, we drive both inorganic and organic growth through brands like Honey Bunches of Oats, Fruity Pebbles, Malt-O-Meal, Bob Evans, and more. Our foodservice and ingredient businesses supply products globally, with offices and manufacturing sites in more than 60 locations across five countries and 11,500+ employees.

About the role

We are seeking a skilled Office Assistant to join our St. Louis headquarters and support our corporate leaders with top-tier administrative and office services. This full-time, onsite role offers the chance to be at the heart of our daily operations—balancing admin support, office coordination, and event logistics. If you’re a multitasker with a sharp eye for detail and a passion for creating order, this is your opportunity to help fuel team success.

Responsibilities

Administrative Support

• Manage calendar and prioritize inquiries and requests, resolve scheduling conflicts, and schedule internal and external meetings for corporate leaders as requested
• Coordinate travel arrangements, prepare itineraries, plan logistics, and prepare and submit expense reports
• Prepare certain documents on behalf of leaders and proofread materials for clarity, completeness, and accuracy
• Prepare and send letters as directed
• Order, schedule, and set up food for luncheons and trainings
• Screen all incoming phone calls, inquiries, visitors, and correspondence, and route accordingly
• Perform research as needed
• Create reports, presentations, and meeting minutes as requested
• Develop and carry out an efficient documentation and filing system
• Coordinate events as necessary
• Perform other administrative duties and project work as assigned

Office Services

• Greet and assist onsite guests
• Order and timely maintain office supply inventory in the building
• Identify opportunities for process and office management improvements, and support these improvements
• Ensure office policies and procedures are implemented appropriately
• Assist with office layout planning and office moves with Corporate Facilities
• Place service calls for office equipment and act as the primary point of contact for general office inquiries and building maintenance
• Maintain and stock copy room, kitchen, and conference rooms in an orderly and timely manner
• Ensure a clean and organized office environment
• Provide oversight for the safety and security of employees and their property
• Manage expense reporting according to internal policies and procedures
• Oversee proper maintenance for coffee service, vending machines, cleaning, etc.
• Liaison with building management company

Requirements

• At least 3-5 years of experience as a receptionist, office manager, or an administrative assistant
• High School degree or equivalent required
• Excellent knowledge of Microsoft Office and Adobe Professional
• Ability to work with minimal oversight
• Exemplary planning and time management skills
• Strong attention to detail and organizational skills
• Ability to solve problems, including non-routine issues
• Ability to multitask and prioritize daily workload
• Establish and maintain cooperative and effective working relationships with others
• Excellent written and oral communication skills
• Self-motivated and ability to work independently
• Complete work with many interruptions
• Ability to maintain discretion and keep highly sensitive information confidential

Physical Demands

• Sitting or standing for extended periods of time
• Bending at the waist, kneeling, or crouching to file materials
• Lifting, carrying, pushing, or pulling objects up to 25 pounds
• Reaching overhead and above shoulders to retrieve supplies

This is a fully onsite role located in St. Louis, Missouri.