Executive Assistant to Chief Executive Officer

About Castelion

Castelion is bringing a new approach to defense development and production: one that focuses on short, iterative design cycles, rapid testing in development, and modern commercial manufacturing strategies for production at scale. We're designing, building, and testing next generation long range strike weapons systems to give America and its Allies a definitive edge and deter future conflicts

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Executive Assistant to C

EO
As Executive Assistant to the CEO at Castelion, you'll be the strategic partner who ensures our leadership can focus entirely on developing next-generation defense technologies that protect America and its allies. Working at a defense technology company where precision, security, and flawless execution are paramount, you'll serve as the operational backbone that enables our CEO to drive the mission of deterring future conflicts through superior long-range strike capabilities. This role offers the unique opportunity to directly support national security objectives while working alongside brilliant engineers and executives in a fast-paced, high-stakes environment where your attention to detail and proactive leadership directly impacts our ability to deliver cutting-edge defense solutio

ns.
Responsibili

• ties
  Executive Operations Management: Manage and optimize the CEOs calendar, including scheduling internal/external meetings, coordinating travel, and managing logis
• tics.Strategic Communication Hub: Act as a gatekeeper and liaison, ensuring clear and timely communication across teams, customers, investors, and government stakehol
• ders.Mission-Critical Project Support: Track and drive execution of high-priority initiatives across engineering, business development, and operations t
• eams.Executive Preparation & Briefings: Support preparation for key meetings, including compiling agendas, briefings, presentations, and n
• otes.Confidential Information Stewardship: Handle highly sensitive and business-critical information with absolute discretion and appropriate security proto
• cols.Event & Meeting Orchestration: Organize team offsites, board meetings, customer visits, and strategic planning sess
• ions.Executive Decision Support: Anticipate needs, resolve issues proactively, and ensure seamless day-to-day operat

ions.
Basic Qualific

• ations
  3+ years of direct experience supporting C-level executives in fast-paced, high-stakes enviro
• nments.Proven ability to manage complex calendars and prioritize scheduling across multiple stakeholders and time zones with accuracy and disc
• retion.Experienced in coordinating travel logistics, including flights, hotels, ground transportation, and a
• gendas.Proficient in managing expense reports and reconciling financial documentation with accuracy and time
• liness.Skilled at producing polished support materials such as slide decks, memos, and briefing doc
• uments.Expert-level proficiency with tools and technologies that streamline EA responsibilities e.g., Google Workspace (Calendar, Docs, Sheets), Microsoft Office, Slack, Zoom, Expensify, TripActions, Notion, and scheduling tools like Calendly or
• Motion.Exceptional organizational skills, attention to detail, and follow-t
• hrough.Calm under pressure and capable of juggling competing priorities and dea
• dlines.Thrives in ambiguous, fast-paced environments; quick to adapt with sound ju
• dgment.Mission-driven with a "no task too small" at
• titude.100% onsite in To

rrance.
Preferred Skills and Ex

• perience
  Previous experience in defense, aerospace, technology, or other mission-critical in
• dustries.History of supporting executives through high-growth phases, funding rounds, or strategic ini
• tiatives.Experience coordinating with government customers, regulatory bodies, or security-sensitive stak

eholders.
All employees are granted long-term stock incentives as part of their employment as Castelion. All employees receive access to comprehensive medical, vision, and dental insurance, and the company offers four weeks of paid time off

per year.
Leadershi

• p Qualities
  Bias to Action & Creative Problem Solving: Desire and experience questioning assumptions in ways that lead to breakthrough ideas that are ultimately implemented. Successfully bring in applicable processes/concepts/materials from other industries to achieve efficiency gains. The ability to personally resolve minor issues in development without requiring signific
• ant support.High Commitment, High Initiative: A successful candidate will have a genuine passion for Castelion's mission and consistently look for ways to contribute to the company's technical goals and prevent hardware blockers. Ability to work in a fast paced, autonomously driven, and demanding atmosphere. Strong sense of accountability an
• d integrity.Clear Communicator: Proactively communicate blockers. Trusted in previous roles to be voice of company with regulators, suppliers, gate keepers and customers. Capable of tactfully managing relationships with stakeholders to achieve company-desired outcomes without compromising relationships. Emails, IMs and verbal interactions are logical, drive clarity, and detailed enough to eliminat

e ambiguity.
ITAR

Requirements:
To conform to U.S. Government export regulations, applicant must be a (i) U.S. citizen or national, (ii) U.S. lawful permanent resident (green card holder), (iii) Refugee under 8 U.S.C. § 1157, or (iv) Asylee under 8 U.S.C. § 1158, or be eligible to obtain the required authorizations from the U.S. Depart

ment of State.
Employment with Castelion is governed on the basis of competence and qualifications and will not be influenced in any manner by race, color, religion, gender, national origin/ethnicity, veteran status, disability status, age, sexual orientation, gender identity, marital status, mental or physical disability or any other legally pr