Manager, Social Media & Strategic Communications

About Castelion

Castelion is bringing a new approach to defense development and production: short, iterative design cycles, rapid testing, and modern commercial manufacturing strategies built for 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. The brand studio you will help build is how the world comes to understand that mission.

Manager, Social Media & Strategic Communications

Castelion is building next-generation strike systems to restore credible deterrence and expand the industrial base for national security. We are looking for a Manager, Social Media & Strategic Communications to lead Castelion's presence across social and owned channels while supporting broader media, executive communications, and strategic storytelling.

This role is responsible for turning Castelion's mission, technology, milestones, leadership perspective, and culture into clear, credible, high-impact content for defense, aerospace, policy, technology, investor, and talent audiences. The right candidate understands how to build momentum on LinkedIn, X, YouTube, and emerging platforms while maintaining the judgment required to communicate in a national-security environment.

You will work closely with company leadership, engineering, business development, recruiting, legal, security, and communications to shape social-first narratives around hypersonic systems, advanced effects, missile defense, defense manufacturing, and emerging national-security technologies.

This is a hands-on role for a sharp writer, fast operator, and high-judgment communicator who can move from strategy to execution quickly. The best candidate will be comfortable writing under deadline, building a content calendar, spotting timely narrative opportunities, working with technical stakeholders, and knowing when not to post.

What You'll Do

• Develop and execute Castelion's social media and owned-channel strategy across social channels, including X, LinkedIn, YouTube, and other priority platforms.

• Own the editorial calendar for company channels, including announcements, milestones, recruiting content, executive perspective, industry commentary, event coverage, and evergreen brand storytelling.

• Draft, edit, schedule, and publish social content that is technically accurate, visually compelling, and appropriate for defense, policy, customer, investor, and talent audiences.

• Build social-first campaigns around major company announcements, product milestones, test activity, launch activity, executive appearances, industry events, and recruiting priorities.

• Partner with creative, design, video, engineering, and recruiting teams to develop visual assets, short-form video concepts, carousels, explainers, and behind-the-scenes content.

• Support executive social presence, including drafting posts, shaping point of view, identifying timely moments, and translating leadership perspective into credible public commentary.

• Monitor defense, aerospace, technology, policy, competitor, and geopolitical conversations to identify relevant moments for Castelion to engage or avoid.

• Produce a concise daily executive media and social brief summarizing relevant coverage, industry developments, competitor activity, social conversation, geopolitical events, and emerging narratives.

• Track channel performance, audience growth, engagement, sentiment, and campaign results, then use those insights to improve content strategy.

• Manage community engagement, comment monitoring, inbound message routing, and escalation workflows.

• Support media strategy for announcements and high-visibility moments, including drafting press materials, talking points, briefing notes, media pitches, and social amplification plans.

• Help identify high-quality podcasts, interviews, conferences, speaking opportunities, and other visibility moments for company leadership.

• Support rapid-response communications and issue management with discretion, accuracy, and sound judgment.

• Maintain consistency of Castelion's external voice, messaging, terminology, and narrative across social, press, web, recruiting, and executive channels.

• Coordinate with legal, security, engineering, and business stakeholders to ensure communications meet OPSEC, export-control, customer-sensitivity, and technical-accuracy standards.

What We're Looking For

• 4-7 years of experience in social media, strategic communications, public affairs, journalism, defense communications, technology communica