Executive Assistant & Workplace Manager; SF

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.

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.

• Manage complex, shifting calendars for senior executives, proactively resolving conflicts and prioritizing time against business needs
• Own end-to-end travel planning and expense reporting for the executive team
• Serve as the primary point of contact and gatekeeper for executive leadership, screening requests and coordinating cross-functional communications
• Manage the SF office day to day: vendor relationships (cleaning, IT/facilities, catering), supply inventory, and maintenance issues
• Plan and execute internal events, offsites, and team gatherings hosted out of the SF office
• Own office budget tracking and vendor invoicing in partnership with Finance
• Prepare materials, agendas, and follow-ups for executive meetings
• Act as the go-to person for all in-office matters, ensuring a professional and functional workplace experience for onsite employees

• 8+ years of experience as an Executive Assistant supporting C-level or senior leadership
• Experience owning an office space or facilities function, including vendor management
• Demonstrated ability to manage complex calendars and travel across competing priorities
• High discretion and judgment handling confidential executive information
• Excellent written and verbal communication
• Based in San Francisco; able to be onsite 5 days per week

• Experience in a startup or scale-up environment
• Vendor negotiation experience
• Event or offsite planning experience
• Familiarity with expense and travel tools such as Ramp, Expensify, or Navan

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.

• 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…