Sr. Administrative/Executive Assistant, Office Manager

Company: Catharos, Inc.

Location: Palo Alto, CA (hybrid), relocating to Oakland, CA (onsite)

Reports to: Head of Operations

About Catharos

Catharos is a Series A-funded stealth climate tech company developing a novel approach to direct air capture of CO₂, preparing to move from bench-scale validation to pilot-scale demonstration.

The Role

Catharos is hiring an Executive Assistant & Office Manager to support our CEO and leadership team and keep our office running. This is a hybrid role for someone who enjoys owning both high-touch executive support and the day-to-day details of a growing office. For the right person, there is a clear path to grow into a Chief of Staff position, helping the company build good structure and organization as it grows — business systems, operational excellence, and reliable execution.

Responsibilities

• Manage complex, fast-changing calendars for the CEO and leadership team, including scheduling with investors, partners, and candidates.
• Arrange travel and prepare expense reports for the executives you support.
• Plan and run logistics for board meetings, investor sessions, offsites, and team events.
• Own day-to-day office operations, including supplies, mail and shipping, guest reception, and catering for a growing onsite team.
• Coordinate interview scheduling and first-day onboarding logistics for new hires.
• Support the leadership team with meeting preparation, follow-ups, and ad hoc projects, handling confidential information with discretion.

Required Qualifications

• 4+ years of experience as an executive assistant, office manager, or in a similar role supporting senior leaders.
• Exceptional organization and follow-through across many simultaneous threads.
• Strong written and verbal communication with stakeholders at all levels.
• Sound judgment and discretion with confidential business and personnel information.
• Comfort building structure and process in an environment where little exists yet.
• Ability to work onsite in Palo Alto one day a week initially, and full-time onsite in Oakland once our next facility opens.

Strongly Preferred Qualifications

• Experience at an early-stage or venture-backed startup.
• Experience supporting multiple executives simultaneously.
• Experience planning board meetings, investor events, or offsites.
• Experience coordinating recruiting logistics and candidate scheduling.
• Ambition to grow into a Chief of Staff role and take on broader operational ownership.

Compensation

• Competitive salary and equity commensurate with experience. Details discussed during the interview process.