Office Administrator

Job Title: Office Administrator

Industry: Professional Services

Location (City, State): Washington, DC

Assignment Type: Contract-to-Hire

Pay: $35–$43/hour (depending on experience)

Work Schedule:

Monday–Friday, 9:00 AM – 5:30 PM (flexibility required for events and peak periods)

Benefits:

This position is eligible for medical, dental, vision, and 401(k).

About Our Client:

Our client is a well-established and highly connected professional services firm based in Washington, DC. They offer a collaborative, polished office environment and are seeking a long-term addition to their team who can serve as a key operational partner across the organization.

Job Description:

We are seeking an experienced Office Administrator to support senior leadership while overseeing daily office operations. This individual will play a critical role in ensuring organizational efficiency, managing administrative systems, and coordinating high-level events. The ideal candidate is detail-oriented, proactive, and comfortable operating in a fast-paced, professional environment.

Key Responsibilities:

Executive Support

• Manage complex calendars and scheduling for senior leadership
• Coordinate meetings with internal stakeholders and external partners
• Arrange domestic and international travel, including logistics and itineraries
• Prepare and reconcile expense reports
• Provide project-based and administrative support as needed
• Develop and maintain internal processes, templates, and documentation

Finance & Accounting Support

• Handle invoicing, accounts receivable, and accounts payable processes
• Assist with bank deposits and reconciliation activities
• Track contract renewals and ensure timely processing
• Review employee expenses for accuracy and policy compliance
• Support reporting and ad hoc financial analysis

Office Management

• Oversee daily office operations and maintain a professional workspace
• Manage vendor relationships, office supplies, and building coordination
• Support onboarding and offboarding processes
• Maintain shared systems, files, and communication tools
• Coordinate internal communications and team activities

Team & Event Coordination

• Assist with scheduling across multiple team members
• Organize internal meetings and maintain reporting documentation
• Plan and execute team outings and internal events

Event Planning & Execution

• Lead logistics for large-scale and high-profile events, including corporate gatherings and fundraisers
• Manage event timelines, vendor coordination, and budgets
• Oversee guest communications, RSVP tracking, and event-day execution
• Coordinate post-event follow-ups and process improvements

Qualifications:

• 10+ years of administrative experience in a professional services environment
• Strong background supporting senior executives
• Experience with bookkeeping and financial coordination tasks
• Proven ability to manage office operations and vendor relationships
• Demonstrated success in planning and executing events
• Proficiency in Microsoft Office 365 (Word, Excel, PowerPoint, Outlook)
• Comfortable learning new tools and technologies, including emerging AI platforms
• Highly organized with strong attention to detail and accuracy
• Excellent communication skills and ability to handle sensitive information with discretion
• Bachelor’s degree preferred; equivalent experience will be considered

Additional Details:

• Contract-to-hire opportunity with long-term potential
• Competitive compensation aligned with experience
• Opportunity to work closely with senior leadership
• Exposure to high-level events and strategic operations

Perks:

• High-visibility role with leadership interaction
• Opportunity to own and improve internal processes
• Involvement in large-scale, high-impact events
• Collaborative and professional team environment

Addison Group is an Equal Opportunity Employer. Addison Group provides equal employment opportunities (EEO) to all employees and applicants for employment without regard to race, color, religion, gender, sexual orientation, national origin, age, disability, genetic information, marital status, amnesty, or status as a covered veteran in accordance with applicable federal, state and local laws. Addison Group complies with applicable state and local laws governing non-discrimination in employment in every location in which the company has facilities. Reasonable accommodation is available for qualified individuals with disabilities upon request.