Job Description

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.

Software & Web Development Intern (Onsite role based in Allen, TX)

Castelion is building next-generation hypersonic missile systems to bring peace through deterrence. As we rapidly develop and scale, we are seeking a highly motivated Software & Web Development Intern to support our software and infrastructure efforts. This role provides an opportunity to work on real-world engineering challenges, collaborating closely with our engineering and operations teams.

Responsibilities

• Develop and maintain internal web applications and dashboards to support engineering and test operations.
• Assist in building and optimizing software infrastructure, including cloud-based tools and automation.
• Support database management, API development, and front-end/back-end web services.
• Collaborate with engineers to improve workflow efficiency and software toolsets.
• Troubleshoot and debug software and web applications as needed.

Basic Qualifications

• Currently pursuing a Bachelor’s or Master’s in Computer Science, Software Engineering, or a related field .
• Experience with web development technologies such as JavaScript, React, Node.js, Python, or Flask/Django .
• Knowledge of databases (SQL, PostgreSQL, Firebase, or MongoDB) .
• Familiarity with cloud platforms (AWS, GCP, or Azure) and CI/CD tools is a plus.
• Strong problem-solving skills and ability to work in a fast-paced, startup environment.
• Interest in aerospace, defense, or high-performance computing is a bonus.

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. 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, applicant must be a (i) U.S. citizen or national, (ii) U.S. lawful, permanent resident (aka 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.

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