Administrative Assistant & Office Manager

Middleburg, VA

Sandboxx builds consumer technology that supports service members and their families across the full military life cycle. We operate at national scale, work closely with the Department of War and the broader military ecosystem, and serve millions of users each year. We are looking for driven, curious people who take ownership of their work, move quickly, and want to build products that have real impact for the military community.

Location: Middleburg, VA
Work Arrangement: Full-time, in-office
Reports to: Senior Executive Assistant

Sandboxx is looking for an organized, dependable, and proactive Administrative Assistant & Office Manager to support our Middleburg office and help keep day-to-day operations running smoothly.

This role will serve as the primary in-person administrative presence in the Middleburg office and work closely with our Senior Executive Assistant, who supports the executive team. You’ll take ownership of office needs, handle administrative tasks that require an onsite presence, and assist with additional projects and responsibilities delegated by the Senior Executive Assistant.

This is an in-person role based in Middleburg, Virginia. Remote work is not available for this position.

• Serve as the primary point person for day-to-day operations of the Middleburg office.
• Maintain office, kitchen, and meeting-room supplies and place orders as needed.
• Receive, sort, and distribute mail, packages, and deliveries.
• Coordinate with building management, vendors, maintenance providers, and other office services.
• Keep shared spaces organized, stocked, and ready for employees and visitors.
• Help identify and resolve office or facilities issues.
• Welcome visitors and assist with onsite meetings.

• Support the Senior Executive Assistant with delegated administrative tasks and projects.
• Print, assemble, organize, scan, ship, and prepare documents or materials as needed.
• Assist with shipping, returns, errands, purchases, and other tasks requiring a local presence.
• Coordinate meeting rooms, meals, catering, and other onsite logistics.
• Assist with reservations, orders, research, tracking, and follow-ups.
• Maintain organized records and administrative documentation.
• Help prepare materials for executive meetings, presentations, events, and travel when physical preparation is required.

• Assist with onsite onboarding and offboarding logistics.
• Help coordinate employee equipment, supplies, merchandise, and other materials.
• Support office lunches, team gatherings, meetings, and company events.
• Assist with company merchandise, gifts, shipments, and special projects.
• Be a dependable onsite resource for employees working from or visiting the Middleburg office.

• 1-2 years of administrative, office management, operations, hospitality, or similar professional experience.
• Highly organized with strong attention to detail.
• Dependable and comfortable taking ownership of day-to-day responsibilities.
• Strong written and verbal communication skills.
• Able to prioritize multiple requests and adjust when priorities change.
• Comfortable working independently while staying closely aligned with the Senior Executive Assistant.
• Resourceful and willing to figure things out rather than waiting for step-by-step direction.
• Professional and trustworthy when handling confidential or sensitive information.
• Comfortable using modern workplace tools and learning new systems.
• Able to work full-time from our Middleburg, Virginia office.
• Military experience/familiarity preferred, but not required.

You make the physical office easy to operate from anywhere. Things are stocked, organized, prepared, shipped, scheduled, and…