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.

Marketing Intern - Summer 2026

Castelion is seeking a driven and talented Marketing Intern for Summer 2026. You’ll play an integral role on the in-house creative team, redefining how aerospace and defense companies market themselves. You'll work alongside experienced marketers and designers, as well as engineers and builders to visually represent one of the fastest growing startups in Los Angeles.

Key Responsibilities

• Produce Marketing Collateral: Produce marketing collateral from conception, through design iterations to completion.
• Coordinate Key Marketing Events: Work closely with the marketing team to devise and support marketing events, both for government partners and hiring events.
• Support In-House Production Team: As a vital member of Castelion’s in-house production team, you will pitch new video ideas, and work alongside photographers, videographers, social media specialists and editors to produce engaging, on-brand visual content for Castelion’s social media.

Basic Qualifications

• Current Student or Recent Grad: Candidate is currently enrolled or a recent graduate of a marketing-adjacent degree program: Marketing, Advertising, Video Production, Graphic Design, etc.
• Photo & Video Understanding: Candidate has a basic understanding of the Adobe Suite: Photoshop, Lightroom, Premiere Pro, Adobe Illustrator and InDesign.
• Juggle Many Projects at Once: Candidate has the ability to juggle multiple projects with Castelion’s in-house production team, marketing team, and brand studio to produce engaging marketing content and events.
• Attention to Detail: Strong time management skills and ability to thrive in a fast-paced environment.

Preferred Skills and Experience

• Bonus Software: Experience in Adobe After Effects, DaVinci Resolve, Cinema 4D, or Autodesk Maya a plus.
• Industry Interest: Demonstrated interest in technology, aerospace and defense, with a willingness to push creative boundaries within a technical industry

Why Castelion

At Castelion, you'll be part of a mission-driven company where every project matters. Our interns don't just observe they contribute directly to critical hardware and software that supports national security. This is a unique opportunity to work at the cutting edge of defense and aerospace engineering, while building the skills and experience to grow into a future leader in the field.

You'll leave with

• Real-world projects that demonstrate your ability to work within branding guidelines and creative direction
• Technical proficiency in Adobe Creative Suite (Photoshop, Illustrator, InDesign)
• Professional development working with client feedback, time management, and collaborating within a design team
• Industry knowledge within video production, vendor relationship, file management, and workflows.

Leadership Qualities

• Bias to Action and Creative Problem Solving. Desire and experience questioning assumptions in ways that lead to break through 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 significant 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 and integrity.
• Clear Communicator. Proactively communicates 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 eliminate ambiguity.

ITAR Requirements

• To conform to U.S. Government export regulations, the 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. Department 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 protected status.

This internship is paid at an hourly rate of $30 per hour. Compensation may vary based on experience and education level. For non-local interns, housing or relocation stipends may be available to help offset temporary living expenses.