Guidance, Navigation & Control (GNC) Simulation Software Engineer

Responsibilities

• Design, develop, and maintain software for a high-fidelity spacecraft simulation platform
• Implement and improve software-in-the-loop (SIL) and hardware-in-the-loop (HIL) simulations to validate flight algorithms
• Develop and enhance Monte Carlo simulation tooling to assess system performance under various conditions
• Incorporate physics-based models into the core simulation infrastructure
• Develop analysis and visualization tools to provide insight into system performance
• Support GNC operations for the satellite fleet, including on-console and on-call rotations
• Collaborate with interdisciplinary teams to model new systems and add features to the simulator

Requirements

• BS or MS in Computer Science, Aerospace Engineering, or an equivalent background
• 2-5+ years of experience in software engineering or building simulations of complex physical systems
• 2-5+ years of experience with Python or other high-level object-oriented programming languages
• U.S. Citizenship, Lawful Permanent Residency, or Refugee/Asylee Status (required for export control compliance)
• Strong problem-solving skills and the ability to work autonomously

Preferred Qualifications

• Understanding of classical or modern control theory and basic orbital mechanics
• Experience with C/C++ and knowledge of memory management or threading
• Experience building and maintaining software infrastructure used across multiple teams
• Experience with statistical analysis techniques and Monte Carlo simulations
• Experience with spacecraft design or database management
• Experience with AI tooling and agentic workflows

Benefits

• Competitive base salary ($120,000 - $175,000 USD)
• Significant equity package via incentive stock options
• High-quality company-subsidized healthcare, disability, and life insurance
• 401(k) retirement planning
• Flexible PTO
• Free on-site catered meals

About the Company

Astranis builds advanced satellites for high orbits, expanding humanity’s reach into the solar system. We provide dedicated, secure networks to large enterprises, sovereign governments, and the US military. With five satellites already on orbit and a growing backlog of commercial contracts, Astranis is a leader in satellite communications, designing and operating our hardware out of our headquarters in Northern California.