About this opportunity
STEM Boomerang lists this Senior GNC Engineer (Navigation) opportunity in rio rancho, New Mexico. Review the employer’s description below for duties, qualifications and application requirements.
Job description
Rio Rancho, United States | Posted on 08/06/2026
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 Senior GNC Engineer to develop advanced navigation solutions for Castelion's long-range hypersonic strike vehicles. This role is critical to enabling precise state estimation across all mission phases, including GPS-denied environments. You will work hands-on with multidisciplinary engineering teams to design, analyze, implement, and validate multi-sensor navigation algorithms, including star tracker-based alternative navigation and sensor fusion architectures, in a fast-paced, hardware-driven environment.
Requirements
Bachelor's, Master's, or PhD in Aerospace Engineering, Electrical Engineering, or related field
5+ years of experience in navigation algorithm development, analysis, and validation for aerospace or high-performance dynamic systems
Strong background in estimation theory, including Extended Kalman Filters (EKF) and multi-sensor fusion
Experience with inertial navigation systems (INS) and integration with external aiding sources (e.g., GNSS, star trackers, or similar sensors)
Familiarity with alternative navigation (alt-nav) techniques for GPS-denied environments
Proficiency in modeling and simulation tools such as MATLAB/Simulink or equivalent
Experience with 3DOF and 6DOF simulation environments and real-time implementation of navigation algorithms
Strong understanding of sensor error modeling (IMUs, star trackers, etc.) and calibration techniques
Familiarity with flight software integration and real-time embedded systems
Strong problem-solving mindset, thriving in a fast-paced, hardware-rich, high flight cadence environment
Employee Equity: Meaningful equity forall full-time employees - share value has increased 150x in three years
Personal Time Off: Four (4) weeks of paidtime off to unplug, reset, and come back sharp—velocity matters,burnout doesn't
Medical: We offer plans at 100% employeecovered and 80% of dependent coverage
Dental & Vision: We cover 90%employees and 80% for dependents to ensure you and your family haveaccess to quality preventive and ongoing care
FSA/HSA: To support long-term health andfinancial resilience, we offer FSA and HSA options that allowemployees to set aside pre-tax dollars for eligible medical anddependent care expenses
Retirement: 401k plan offered to supportlong term financial growth along side high-impact, high-velocity work
Paid Parental Leave: We support growingfamilies with meaningful time to bond and recover. Birthing parentsare eligible for up to 10 weeks of paid leave, while non-birthingparents may take up to 4 weeks of paid leave. This time can be usedfor pre-natal care, pregnancy, childbirth, and related medicalneeds—ensuring every parent has the support they need during thisimportant life moment.8-weeks of paid parental leave for allparents. Additional paid pregnancy leave for CA employees
Meals & Catering: Frequently cateredlunches and team meals, plus company-covered meals when extra timeor effort is required
Snacks & Beverages: Fully stockedkitchen with unlimited snacks and drinks to keep you fueledthroughout the day
Performance & Fitness: $100 monthlyfitness stipend to support peak performance and health, both insideand outside of work
EV Charging: Onsite electric vehiclecharging available for employees
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Worksite address
rio rancho, NM, 87144, US
Who can apply
Review the original listing for work authorization, qualifications and employer requirements.