Simulation Engineer

Simulation Engineer Spacecraft represent the most pressing unmet need across the entire aerospace industry. As more launch vehicles come online and the cost to orbit decreases, more companies launching payloads to space continue to emerge. For the first time in history, this influx of payload companies combined with reduced launch costs has resulted in a massive increase in need for commercial spacecraft platforms, known as satellite buses. These buses hold the payloads of our customers and are flown on launch vehicles. Apex manufactures these satellite buses at scale using a combination of software, vertical integration, and hardware that is designed for manufacturing. Our spacecraft enable the future of society: ranging from earth observation to communications and more. We’d love for you to join us on our mission of providing humankind access to the galaxy beyond our planet. ABOUT THE ROLE As a Simulation Engineer, you will be responsible for developing closed-loop spacecraft test platforms — such as six degrees of freedom simulation platform (6DOF), software-in-the-loop (SITL) and hardware-in-the-loop (HITL) — and executing simulation testing strategies to validate and verify the performance, functionality, and reliability of satellite systems. Your expertise and attention to detail will play a critical role in ensuring the successful deployment and operation of Apex's satellite buses. In this role, you will collaborate with multidisciplinary teams of engineers and technicians to design, implement, and integrate realistic test environments using simulation and emulation tools. We are looking for motivated engineers who are eager to solve complex problems with a focus on practicality and scalability, and who thrive in a dynamic, fast-paced environment. Responsibilities: • Own closed-loop spacecraft simulation platforms from initial design to deployment • Develop and maintain core simulation capabilities such as scheduling, data routing, diagnostics, configuration, and Monte Carlo capabilities • Develop and maintain simulation models, emulators, and hardware/software interfaces with units under test • Collaborate with cross-functional teams to define test requirements, test procedures, and execute tests • Analyze test data, identify trends, and generate meaningful insights for test results and model improvements • Develop tools to automate simulation workflows, enable data analysis, and produce test reports • Debug complex closed-loop interactions between units under test and simulation • Help shape long-term technical architecture and roadmap for our simulation platforms Qualifications: • U.S. Person status is required as this position needs to access export-controlled data. • Bachelor’s degree in Computer Science, Computer Engineering, Electrical Engineering, Aerospace Engineering, or a related field. Master's degree is a plus. • 3+ years of experience developing closed-loop simulation tools e.g. 6DOF, SITL, PITL, HITL • Strong proficiency in programming languages such as C/C++, Rust, Python. • Comfortable operating and developing within Linux environments • Familiarity with standard software development practices, including testing frameworks, Docker, CI/CD pipelines, and agile development • Experience designing, implementing, and validating physics-based simulation models for closed-loop systems • Experience emulating and integrating virtual sensors, actuators, and test equipment with serial interfaces, network interfaces, and conventional I/O interfaces • Experience with data analysis techniques, automation tools, and pipeline development • Strong analytical and problem-solving skills with keen attention to details • Excellent verbal and written communication skills • Proven ability to work independently and take ownership of technical deliverables • Proven ability to work in a fast-paced and dynamic environment while delivering results Preferred Qualifications: • Experience in aerospace o ... (truncated, view full listing at source)