Office Manager

Job description

Why Castelion, Why Now Castelion is moving incredibly fast to develop and deliver advanced defense systems at a time when execution matters more than ever. We believe focus and technical excellence are decisive advantages - and we are building a team that can deliver real capability, not just concepts. This is a rare opportunity to join at an early stage, where your work will directly shape critical systems, influence major technical decisions, and have immediate, real-world impact. Office Manager We are seeking a highly organized, proactive Office Manager to own the day-to-day operations of Castelion's Washington DC office, which serves as a key hub for customer engagement, executive meetings, and external events. This role is responsible for ensuring the office runs smoothly, professionally, and reliably. This is not a traditional administrative office role this position is critical to shaping the first impression of Castelion for customers, partners, and stakeholders. You will manage operations, logistics, and experience within a high-visibility environment that frequently hosts important meetings, briefings, and events. The ideal candidate is detail-oriented, operationally stro...