Senior Simulation Software Engineer, GNC

Castelion Corporation • Torrance, CA

1d

About The Position

We're looking for a GNC Simulation Software Engineer to design, develop, and maintain high-fidelity simulation software supporting missile guidance, navigation, and control (GNC) development. In this role, you'll work closely with GNC algorithm developers, flight software engineers, and test teams to create fast, accurate, and robust simulations that drive system architecture decisions, performance assessments, and mission success.

Requirements

• Bachelors or Masters degree in computer engineering, computer science, aerospace engineering, or a related field.
• Strong proficiency in C++ or Rust for high-performance numerical modeling.
• Proficiency with databases and large data structures.
• Familiarity with version control, CI/CD pipelines, and modern software engineering practices.
• Experience with numerical integration, coordinate transformations, and simulation architecture.
• Experience with software integration, specifically linking disparate software modules (e.g., embedding Rust code in C++, Python bindings for C++ libraries).
• Familiarity with GNC concepts in aerospace or missile systems.
• Ability to develop well-structured, scalable, and efficient code.

Nice To Haves

• Experience with missile dynamics, aerodynamics, or propulsion modeling.
• Background in Monte Carlo simulation pipelines and statistical analysis.
• Experience with hardware-in-the-loop or real-time simulation.
• Exposure to sensor modeling (IMU, GPS, radar, seekers) or actuator modeling (TVC, CAS).
• Experience integrating simulations with GNC or embedded flight software environments.
• Experience designing APIs or internal tools for engineering teams.

Responsibilities

• Develop and maintain a 6-DoF missile simulation software platform.
• Build scalable infrastructure to execute, manage, and aggregate data from Monte Carlo campaigns, along with automated performance evaluation tools.
• Ensure appropriate configuration management and shared sources of truth between simulation and flight code.
• Optimize software for real-time or hardware-in-the-loop (HITL) execution where required.
• Develop robust testing, verification, and documentation practices to ensure reliability and correctness.
• Support flight software integration, pre-flight analysis, and post-flight reconstruction.

Benefits

• Long-term stock incentives
• Comprehensive medical, vision, and dental insurance
• Four weeks of paid time off per year

What This Job Offers

• Job Type: Full-time
• Career Level: Senior
• Education Level: Associate degree