Senior GNC Engineer: Navigation & Sensor Fusion (Equity)

Castelion Corporation; Torrance (CA); On-site; USD 140,000 - 180,000; Full time

Benefits offered by this job

Equity stake for employees

Paid time off: 4 weeks

10 holidays

Health benefits 100% employee coverage

Parental leave

Fitness stipend

Onsite EV charging

Catered meals and stocked kitchen

Job summary

Castelion is seeking a Senior GNC Engineer to develop advanced navigation solutions for long-range hypersonic platforms. You will lead multi‑sensor state estimation using EKF, fuse data from IMUs, star trackers, and GNSS, and implement algorithms in real‑time embedded systems.

You will collaborate with avionics, flight sciences, and software teams, perform modeling and validation, and contribute to hardware‑in‑the‑loop and flight testing.

Qualifications

• 5+ years of navigation algorithm development and validation for aerospace systems.
• Strong background in EKF and multi-sensor fusion.
• Experience with INS integration and GPS-denied navigation approaches.

Responsibilities

• Design and develop navigation algorithms for high-speed flight vehicles (INS and alt-nav).
• Develop multi-sensor fusion architectures using EKF and related estimation techniques.
• Integrate data from IMUs, star trackers, GNSS (when available) and other sensors.
• Collaborate with avionics and flight software teams for real-time implementation.
• Conduct modeling, simulation, and analysis of navigation performance under GPS-denied conditions.
• Support HIL testing, flight testing, and post-flight analysis for system improvements.
• Characterize sensor performance and inform filter design and tuning.
• Develop tools/frameworks for navigation algorithm verification and validation.
• Mentor junior engineers and contribute to best practices.
• Partner with program leadership for technical trades aligned with mission success.

Skills

Navigation algorithm development

Estimation theory

Multi-sensor fusion

Real-time embedded systems

Problem solving

Education

PhD in Aerospace Engineering or related field

Tools

MATLAB/Simulink

Job description

Castelion is seeking a Senior GNC Engineer to develop advanced navigation solutions for long-range hypersonic platforms. You will lead multi‑sensor state estimation using EKF, fuse data from IMUs, star trackers, and GNSS, and implement algorithms in real‑time embedded systems.

You will collaborate with avionics, flight sciences, and software teams, perform modeling and validation, and contribute to hardware‑in‑the‑loop and flight testing.