Astranis builds advanced satellites for high orbits, expanding humanity’s reach into the solar system. Today, Astranis satellites provide dedicated, secure networks to highly-sophisticated customers across the globe— large enterprises, sovereign governments, and the US military. With five satellites on orbit and many more set to launch soon, the company is servicing a backlog of more than $1 billion of commercial contracts.

Astranis is the preferred satellite communications partner for buyers with stringent requirements for uptime, data security, network visibility, and customization. Astranis has raised over $750 million from some of the world’s best investors, from Andreessen Horowitz to Blackrock and Fidelity, and employs a team of 450 engineers and entrepreneurs. Astranis designs, builds, and operates its satellites out of its 153,000 sq. ft. headquarters in Northern California, USA.

Guidance, Navigation & Control (GNC) Simulation Software Engineer

As a Simulation Software Engineer on the GNC team, you will design, develop, and test our high-fidelity spacecraft simulation that is used to validate the software that controls our satellites while in orbit.

You will improve the core simulation infrastructure and collaborate with engineering teams across the company to model new systems and add interesting new features to the simulator.

Role

Design, develop, and maintain software for our high-fidelity software simulation platform
Implement and improve software- and hardware-in-the-loop simulations to validate satellite software and flight algorithms
Accelerate the software development process through infrastructure improvements
Develop and enhance Monte Carlo simulation tooling for assessing system performance under various conditions
Incorporate physics-based models into simulation
Develop analysis and visualization tooling to provide insight into our system
Support GNC operations for our fleet of satellites, including on-console and on-call rotations
Support in recruiting, interviewing, and hiring additional teammates to our rapidly-growing team

Requirements

BS or MS in Computer Science, Aerospace Engineering, or equivalent background experience
2-5+ years in software or building simulations of complex physical systems
2-5+ years experience with Python or other high-level object-oriented programming language(s)
Ability to effectively collaborate with interdisciplinary teams on large software projects
Strong problem-solving skills and attention to detail
Highly motivated, self-starting, and able to perform duties autonomously without much supervision
Don't meet them all? Not a problem. Please apply even if you do not meet all these criteria.

Bonus

Understanding of classical or modern control theory, and basic orbital mechanics
Knowledge of memory management, threading, and interprocess communication techniques
Experience building and maintaining software infrastructure used across teams
Experience in statistical analysis techniques and Monte Carlo simulation
Experience with C/C++
Experience with AI tooling and agentic workflows
Experience with databases
Experience with spacecraft design

What we offer:

All our positions offer a compensation package that includes equity and robust benefits.

Base pay is just one component of Astranis’s total rewards package. Your compensation also includes a significant equity package via incentive stock options, high-quality company-subsidized healthcare, disability and life insurance, 401(k) retirement planning, flexible PTO, and free on-site catered meals.

Astranis pay ranges are informed and defined through professional-grade salary surveys and compensation data sources. The actual base salary offered to a successful candidate will additionally be influenced by a variety of factors including experience, credentials & certifications, educational attainment, skill level requirements, and the level and scope of the position.

Base Salary

$120,000—$175,000 USD

U.S. Citizenship, Lawful Permanent Residency, or Refugee/Asylee Status Required

(To comply with U.S. Government space technology export regulations, applicant must be a U.S. citizen, lawful permanent resident of the United States, or other protected individual as defined by 8 U.S.C. 1324b(a)(3))

Our mission and our products are meant to connect the world and everyone in it, regardless of gender, race, creed, or any other distinction. We believe in a diverse and inclusive workplace, and we encourage all people to join our team and bring their unique perspective to help make us stronger.