Executive Assistant & Workplace Manager (SF)

Who Are We? RZR is an AI-native advertising platform built for the next era of performance marketing. We operate at the intersection of machine learning, programmatic media, and full-funnel mobile growth, powering campaigns for some of the world's most ambitious advertisers. Our platform is purpose-built to deliver outcomes at scale, not just impressions. We are a team of builders, operators, and technologists who believe the advertising industry is overdue for a fundamental rethink. We move fast, operate with a high degree of ownership, and hold ourselves to an exceptionally high standard of craft. RZR is scaling aggressively with an active M&A pipeline and a platform vision that puts us on a path to becoming an industry leader. This is a rare opportunity to join a company at an inflection point and help shape what it becomes. Role Overview We are looking for a seasoned Executive Assistant & Workplace Manager to become the backbone of our San Francisco office. This is a dual-scope role: the majority of your time goes to high-trust executive support — owning calendars, travel, and communications for our C-suite — while you also take full ownership of our physical office, from vendors and supplies to events and day-to-day facilities. This is a brand-new role, which means you will be building the systems and standards from scratch rather than inheriting someone else's playbook. You will work onsite five days a week and be the person our leadership team and SF employees rely on to keep everything running smoothly. The right person for this role combines the discretion and judgment of a seasoned EA with the operational ownership of someone who thrives running a function independently. If you want a role with genuine variety, high visibility, and the satisfaction of building something lasting — this is it. Key Responsibilities Manage complex, shifting calendars for senior executives, proactively resolving conflicts and prioritizing time against business needsOwn end-to-end travel planning and expense reporting for the executive teamServe as the primary point of contact and gatekeeper for executive leadership, screening requests and coordinating cross-functional communicationsManage the SF office day to day: vendor relationships (cleaning, IT/facilities, catering), supply inventory, and maintenance issuesPlan and execute internal events, offsites, and team gatherings hosted out of the SF officeOwn office budget tracking and vendor invoicing in partnership with FinancePrepare materials, agendas, and follow-ups for executive meetingsAct as the go-to person for all in-office matters, ensuring a professional and functional workplace experience for onsite employees Required Skills And Experience Must-Have 8+ years of experience as an Executive Assistant supporting C-level or senior leadershipExperience owning an office space or facilities function, including vendor managementDemonstrated ability to manage complex calendars and travel across competing prioritiesHigh discretion and judgment handling confidential executive informationExcellent written and verbal communicationBased in San Francisco; able to be onsite 5 days per week Nice-to-Have Experience in a startup or scale-up environmentVendor negotiation experienceEvent or offsite planning experienceFamiliarity with expense and travel tools such as Ramp, Expensify, or Navan Work Setup This is a fully onsite role based in our San Francisco office, five days per week. Candidates must be located in or able to commute to San Francisco. Remote and hybrid candidates will not be considered. Why Join RZR? Direct, daily partnership with both the CEO and COO — this is a high-trust, high-visibility role from day one. You will be an extension of the executive office, not a supporting function at a distance.Build from the ground up — there is no existing playbook to inherit. You will design the systems, set the standards, and define what great executive and workplace support looks like at RZR's SF headquarters.Broad, varied scope — no two days look the same. You will move between executive calendar management, vendor negotiations, event logistics, and office operations — a genuinely wide-ranging mandate.Be the face of RZR in San Francisco — for the onsite team and every visitor who walks through the door, you are the person who sets the tone for what RZR feels like as a place to work.Fast-growing company at an inflection point — RZR is profitable, scaling aggressively, and investing in its headquarters. The work you do here will matter and will be seen. RZR Behaviors RZR operates by eight core behaviors: Extreme Ownership Move Fast Drive for Excellence Proactive Communication Courage Curiosity Deliver Results Manage Ambiguity