Senior GNC Simulation Engineer - Real-Time 6-DoF & HITL

Castelion Corporation; Torrance (CA); On-site; USD 120,000 - 180,000; Full time

Job summary

Castelion is seeking a Senior Simulation Software Engineer to design, develop, and maintain high-fidelity GNC simulations for missile guidance, navigation, and control. You will work with GNC algorithm developers, flight software engineers, and test teams to shape architecture decisions and performance assessments.

The role focuses on real-time and HITL-capable simulations, robust testing, and integration with flight software, with significant ownership and measurable impact on mission success.

Qualifications

• 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.

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.

Skills

C++/Rust

Databases

Version control/CI-CD

GNC/missile systems knowledge

High-performance computing

Education

Bachelor's/Master's in a related field

Tools

Rust/C++ bindings

Python bindings for C++ libs

Job description

Castelion is seeking a Senior Simulation Software Engineer to design, develop, and maintain high-fidelity GNC simulations for missile guidance, navigation, and control. You will work with GNC algorithm developers, flight software engineers, and test teams to shape architecture decisions and performance assessments.

The role focuses on real-time and HITL-capable simulations, robust testing, and integration with flight software, with significant ownership and measurable impact on mission success.