Administrative Assistant III

Administrative Assistant - Corporate Experience

6‑month, full‑time (40 hours/week), hybrid contract role. Located in San Francisco, CA.

This role provides high‑level administrative support to senior managers and broader teams, serving as a key operational partner within the organization. The Administrative Assistant III independently manages complex administrative tasks, acts as a primary point of contact for internal and external stakeholders, and ensures smooth day‑to‑day operations through strong organization, judgment, and communication.

• Efficiently manage complex calendars, prioritize meetings, and coordinate meeting logistics (rooms, visitor access, equipment).
• Arrange comprehensive travel arrangements, compile expense reports, and ensure timely reimbursements.
• Produce correspondence, reports, and presentations; manage mail and communications; maintain files, databases, and sensitive records.
• Identify opportunities to improve administrative processes.
• Track data and provide analysis, produce reports, and train junior administrative staff.
• Support special projects and serve as the first point of contact for inquiries related to the team or department.

• 5+ years of experience in administrative support roles.
• Passion for operational excellence with a strong foundation in executive support and office administration.
• Proficient in Microsoft Office, especially Outlook, Word, Excel, and PowerPoint.
• Familiarity with corporate administrative policies, travel and expense processes, and meeting best practices.
• Skilled in collaborating with senior leaders, cross‑functional teams, and external partners.
• Able to work independently and manage multiple priorities simultaneously.
• Flexible and adaptable to changing priorities, timelines, and stakeholder needs.
• Strong written and verbal communication skills with exceptional attention to detail.
• Demonstrates sound judgment, discretion, and professionalism when handling confidential information.

$40.00 – $41.38 per hour (W‑2).

San Francisco, CA. Hybrid work schedule required.

Eligible for PTO, health and dental insurance, and 401(k) benefits upon meeting certain length of service and hours requirements.

Mathys+Potestio values applicants of all backgrounds and experiences. We do not discriminate based on race, color, national or ethnic origin, ancestry, age, religion or religious creed, disability or handicap, sex or gender, gender identity and/or expression, sexual orientation, military or veteran status, genetic information, or any other characteristic protected under applicable federal, state, or local law.