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Apex manufactures satellite buses at scale for the commercial space industry, combining software, vertical integration, and hardware designed for manufacturing. These platforms enable earth observation, communications, and other critical space-based services.
As a Simulation Engineer, you will own the development of closed-loop spacecraft test platforms—including six degrees of freedom simulation (6DOF), software-in-the-loop (SITL), and hardware-in-the-loop (HITL) systems. You will be responsible for designing, implementing, and validating simulation environments that verify the performance, functionality, and reliability of satellite systems before deployment.
Key responsibilities include:
- Owning closed-loop spacecraft simulation platforms from initial design through deployment
- Developing and maintaining core simulation capabilities such as scheduling, data routing, diagnostics, configuration, and Monte Carlo analysis
- Creating and maintaining simulation models, emulators, and hardware/software interfaces with units under test
- Collaborating with cross-functional engineering teams to define test requirements, procedures, and execution strategies
- Analyzing test data, identifying trends, and generating insights for model improvements
- Developing automation tools for simulation workflows, data analysis, and test reporting
- Debugging complex closed-loop interactions between test units and simulation environments
- Contributing to long-term technical architecture and roadmap for simulation platforms
You will work in a fast-paced, dynamic environment alongside multidisciplinary teams of engineers and technicians, with a focus on practical, scalable solutions to complex problems.
QUALIFICATIONS:
- U.S. Person status required (access to export-controlled data)
- Bachelor's degree in Computer Science, Computer Engineering, Electrical Engineering, Aerospace Engineering, or related field (Master's degree preferred)
- 3+ years of experience developing closed-loop simulation tools (6DOF, SITL, PITL, HITL)
- Strong proficiency in C/C++, Rust, and Python
- Comfortable operating and developing within Linux environments
- Familiarity with standard software development practices: testing frameworks, Docker, CI/CD pipelines, 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, network, and conventional I/O interfaces
- Experience with data analysis techniques, automation tools, and pipeline development
- Strong analytical and problem-solving skills with attention to detail
- Excellent verbal and written communication
- Proven ability to work independently and take ownership of technical deliverables
- Ability to thrive in fast-paced, dynamic environments
PREFERRED QUALIFICATIONS:
- Experience in aerospace or satellite industry
- Knowledge of satellite subsystems (sensors, actuators, controls, communications, power)
- Experience engineering complex systems requiring precise timing, deterministic execution, and high performance (real-time, HPC systems)
- Experience developing and maintaining complex build systems, virtual test environments, and CI/CD infrastructure
- Knowledge of embedded Linux or real-time operating systems
