Castelion was founded to restore America’s ability to field advanced weapons at speed and scale. Inspired by the engineering urgency of the WWII and Apollo eras, we combine rapid iteration, vertical integration, and scalable manufacturing to deliver affordable, high-performance strike systems. Our mission: rebuild industrial agility to strengthen national security and outpace evolving threats.

About the Role:

We are seeking a Lead Integration & Test Engineer with deep expertise in the integration and verification of warhead systems into complete hypersonic missile vehicles. This role focuses on leading the safe and reliable integration of warheads (including energetics, fuzing, safe-and-arm devices, and structural interfaces) with missile airframes, radars, propulsion, avionics, and thermal protection systems. You will own end-to-end integration & test strategies from subassembly through full vehicle level, supporting ground qualification, environmental testing, and flight test campaigns for next-generation hypersonic strike weapons. You will serve as the technical authority on warhead-vehicle integration and test, collaborating closely with design, manufacturing, propulsion, radar, quality, and mission assurance teams to meet stringent DoD standards and mission requirements.

Requirements

Required Qualifications

Education:

Bachelor's or Master's degree in Aerospace Engineering, Mechanical Engineering, Systems Engineering, or related field.

Experience:

8+ years in integration and test for complex aerospace or defense systems.
4+ years specifically working with warheads, munitions, or energetic systems integration.
Demonstrated leadership of vehicle-level integration and test campaigns, preferably on missile or hypersonic programs.

Technical Skills

Strong experience with ordnance handling, safe-and-arm devices, and energetic materials integration.
Proficiency in test automation (LabVIEW, Python, MATLAB), data acquisition systems, and telemetry.
Hands-on with environmental testing and ordnance functional verification.
Requirements management and configuration control.
Familiarity with 3D CAD for integration planning.

Preferred Experience

Direct experience on DoD missile or hypersonic warhead programs.
Background in fast-paced development environments
Knowledge of insensitive munitions and advanced warhead designs.
Prior flight test support at ranges
Experience with classified programs and TS/SCI level work.

Soft Skills

Proven ability to lead technical teams in high-stakes, safety-critical environments.
Excellent communication and presentation skills for executive and customer briefings.
Strong problem-solving under stringent safety and schedule constraints.

Benefits

Employee Equity: Meaningful equity for all full-time employees - share value has increased 150x in three years
Personal Time Off: Four (4) weeks of paid time off to unplug, reset, and come back sharp—velocity matters, burnout doesn't
Company Paid Holidays: Ten (10) company paid holidays
Medical: We offer plans at 100% employee covered and 80% of dependent coverage
Dental & Vision: We cover 90% employees and 80% for dependents to ensure you and your family have access to quality preventive and ongoing care
FSA/HSA: To support long-term health and financial resilience, we offer FSA and HSA options that allow employees to set aside pre-tax dollars for eligible medical and dependent care expenses
Retirement: 401k plan offered to support long term financial growth along side high-impact, high-velocity work
Paid Parental Leave: We support growing families with meaningful time to bond and recover. Birthing parents are eligible for up to 10 weeks of paid leave, while non-birthing parents may take up to 4 weeks of paid leave. This time can be used for pre-natal care, pregnancy, childbirth, and related medical needs—ensuring every parent has the support they need during this important life moment.8-weeks of paid parental leave for all parents. Additional paid pregnancy leave for CA employees
Meals & Catering: Frequently catered lunches and team meals, plus company-covered meals when extra time or effort is required
Snacks & Beverages: Fully stocked kitchen with unlimited snacks and drinks to keep you fueled throughout the day
Performance & Fitness: $100 monthly fitness stipend to support peak performance and health, both inside and outside of work
EV Charging: Onsite electric vehicle charging available for employees

Learn more about this Employer on their Career Site