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, ownership, and excellence are decisive advantages - and we're building a world-class team to turn bold ideas into real capability.
This is a rare opportunity to join at an early stage, where you'll have significant ownership, collaborate with exceptional teammates, and make a direct, measurable impact on our mission and the future of the company - regardless of your function.
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.
NX Engineer
Castelion is seeking a hands-on, high-agency NX Engineer to own the Siemens NX and support Teamcenter environment that our design engineers depend on every day. You will be the go-to technical expert for NX across Castelion's hypersonic vehicle programs, keeping the CAD/PLM toolchain fast, stable, and standardized so engineers can move from concept to flight hardware in weeks, not years. This role is ideal for someone who thrives in fast-paced environments, loves solving engineers' problems at the desk and at scale, and wants to see their work directly accelerate flight hardware.
Responsibilities
- Own installation, licensing, configuration, and upgrades of Siemens NX across engineering workstations, including license server administration and version rollouts
- Administer and support NX/Teamcenter integration (NX Integration), with working awareness of BMIDE data model configuration and Active Workspace
- Provide desk-side and remote support to design engineers, troubleshooting CAD, data management, and performance issues quickly to keep hardware programs moving
- Develop and deliver training for engineers on NX best practices, workflows, and Castelion standards
- Build and maintain NX templates, drafting and modeling standards, and customer defaults
- Automate repetitive engineering tasks using NX Open, journals, and Knowledge Fusion
- Enable model-based definition (MBD) and PMI practices to support manufacturing, inspection, and supplier data packages
- Support NX CAM users and post-processor configuration as needed
- Coordinate with ECAD (Altium) users and tool owners to ensure smooth MCAD/ECAD coexistence and data exchange
- Create and maintain documentation for configurations, procedures, and known issues
- Serve as primary liaison with Siemens support and resellers, managing tickets, escalations, and roadmap discussions
Basic Qualifications
- 5+ years of experience administering or supporting Siemens NX in an engineering environment
- Hands-on experience with NX/Teamcenter integration and Teamcenter administration concepts
- Experience with NX licensing, installation, deployment, and version upgrades
- Strong troubleshooting skills and a customer-first mindset when supporting engineers
- Experience in aerospace, defense, or other hardware-focused industries
- Ability to work on-site in Torrance 5 days a week with occasional travel to other sites across US
Preferred Qualifications
- Active Top Secret security clearance
- Experience with NX Open (C#, C++, Python, or VB.NET), journals, and Knowledge Fusion
- Experience with BMIDE, Active Workspace, and Teamcenter workflows
- Experience implementing MBD/PMI in a production environment
- NX CAM and post-processor experience
- NX Routing experience (Routing Electrical for 3D wire harness design, Routing Mechanical for tubing/piping), ideally alongside Siemens Capital (Capital Harness Design / Formboard)
- Experience with Siemens Fibersim for NX (composite ply design, flat patterns, and manufacturing outputs such as ply nesting and laser projection)
- Familiarity with Altium Designer and MCAD/ECAD collaboration
- Experience supporting engineering IT in a CMMC / NIST 800-171 or ITAR-controlled environment
Benefits And Perks
All full-time employees are granted meaningful long-term equity, sharing in the company's significant growth trajectory. We offer four (4) weeks of paid time off, ten (10) company-paid holidays, and comprehensive health benefits - including 100% employee-covered medical and strong dependent coverage, along with dental and vision plans. We also provide paid parental leave to support growing families, a $100 monthly fitness stipend to promote health and performance, and onsite EV charging for convenience. In addition, employees enjoy perks like catered meals, company-covered food during high-demand periods, and a fully stocked kitchen to stay fueled throughout the day.
An active Top Secret clearance is preferred. Candidates without an active clearance must have the ability to obtain and maintain a U.S. government–issued security clearance. U.S. citizenship is required, as only U.S. citizens are eligible for a security clearance.
Affirmative Action/EEO Statement 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.
Castelion offers a generous benefits package. Please refer to the bottom of our Careers page for more details.
Other Duties
Please note this job description is not designed to cover or contain a comprehensive listing of activities, duties or responsibilities that are required of the employee for this job. Duties, responsibilities and activities may change at any time with or without notice.
Additional Eligibility Requirements
This position may require access to classified information or restricted U.S. Government sites, systems, or information, as determined by the Company and/or applicable U.S. Government requirements. If the position is so designated, your employment in the role may be contingent upon your ability to obtain and maintain the required U.S. Government security clearance or other government authorization, and to satisfy any citizenship or other eligibility requirements imposed by applicable law, regulation, executive order, or government contract requirements. You will be notified if and when such requirements apply.
Affirmative Action/EEO Statement
Castelion is an Equal Opportunity Employer. We are committed to providing equal employment opportunities to all applicants and employees without regard to race, color, religion, sex, sexual orientation, gender identity, national origin, age, disability, genetic information, protected veteran status, or any other characteristic protected by applicable federal, state, or local law.
Castelion is committed to providing reasonable accommodations to qualified individuals with disabilities throughout the application and hiring process. If you require a reasonable accommodation to complete an application, participate in the interview process, or otherwise participate in the hiring process, please contact hr@castelion.com. Requests for accommodation will be considered on an individual basis and handled in accordance with applicable law.
Castelion is committed to fostering a workplace where employment decisions are based on qualifications, business needs, and the ability to perform the essential functions of the role, with or without reasonable accommodation.
EAR/ITAR Requirements
This position requires access to export-controlled information, and as such, employment (or hiring of a contractor) is contingent upon the candidate’s ability to access all applicable export-controlled information without additional export licensing being required by the Bureau of Industry and Security and/or the Directorate of Defense Trade Controls.
