Sr. Administrative/Executive Assistant, Office Manager

Company: Catharos, Inc.

Location: Palo Alto, CA (hybrid), relocating to Oakland, CA (onsite)Reports to: Head of OperationsAbout 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.