Business Operations & Workplace Manager

Sei Development Foundation is seeking an experienced operations generalist to be a go-to operator across the business and run the physical office in NoHo. You'll join the Operations team as the sole owner of workplace experience, creating the experiences that make people want to come into the office while handling executive support, events, people operations, finance operations, and general business operations. This is a builder's role with no facilities team behind you, where you balance operational excellence with real hospitality and keep culture and community as your north star. As a 5 days per week on-site role, you'll be the steady presence in the office, welcoming people and making each day count.

What you'll do

• Provide executive assistant-style support: calendar management, travel and logistics, meeting prep, and follow-through
• Support recruiting logistics including candidate communication, scheduling on-site visits, and delivering a great candidate experience
• Run new-hire onboarding, including equipment, accounts, access, and delivering a welcoming first day
• Support finance operations: expense management, invoices, vendor management, and budget tracking
• Take on cross-functional special projects and process improvements such as setting up new systems, running audits, and building workflows
• Run daily office operations: front-of-house, mail and packages, snacks and supplies, and general upkeep
• Own vendor and landlord relationships, including sourcing, contracts, renewals, and service quality
• Be the first point of contact for employee requests and office issues, resolving them yourself or finding who can
• Manage facilities needs such as space planning, repairs, equipment, and safety compliance
• Own the office budget: track spend, negotiate pricing, and flag cost-saving opportunities
• Plan and run team events, including offsites, happy hours, and gatherings
• Coordinate company-wide moments such as all-hands and milestone celebrations
• Build in-person rituals and traditions that make the office the center of the community
• Gather employee feedback and keep improving the workplace experience

What you bring

• 5-10 years in operations, executive support, chief of staff, office management, or a similar role
• A true generalist mindset: comfortable moving from planning an offsite to reconciling expenses to onboarding a new hire in the same day
• Track record of working independently as the sole owner of an area
• Strong vendor management and budgeting skills
• Experience planning events from start to finish
• Highly organized and proactive: you spot problems before they are reported
• Excellent judgment and discretion with sensitive information
• Clear, warm communication style where you treat colleagues as customers
• Comfort in a small company where you wear many hats
• Ability to work on-site at the Manhattan office 5 days a week
• Experience with workplace and business tools such as Google Workspace, Slack, Notion, expense and procurement platforms, and HR systems, plus fluency in using AI to work faster

Nice to have

• Passion for web3 and interest in blockchain ecosystems
• Experience at a startup or high-growth company