Software Engineer - Simulation

York Space Systems is building spacecraft simulation capabilities that help teams validate behavior, support regression testing, and accelerate mission test planning. In this onsite role in Greenwood Village, you will develop physics-based simulation components, connect them to avionics and telemetry models, and work alongside Systems Architecture and FSW teams to keep simulation workflows reliable and release-ready.

What you’ll do

• Develop and maintain the physics simulator, increasing both model fidelity and runtime performance
• Create new simulation capabilities aligned to new vehicle components and validate that models reflect real behavior
• Author, develop, and integrate mission test scenarios, including fault and off-nominal cases
• Build and maintain interface emulation logic
• Model telemetry to a level suitable for meaningful regression testing
• Support and extend development that targets the hardware interface with the simulation environment
• Collaborate with Systems Architecture and FSW teams on component development
• Collaborate with other teams on simulation health
• Support internal users directly and incorporate their feedback into simulation models
• Follow SIT software development processes to enable fast and quality releases
• Implement software development, testing, and CI/CD practices that meet division and department standards
• Develop and maintain product documentation, user guides, and model validation records

Required qualifications

• Bachelor's degree or greater in Aerospace Engineering, Mechanical Engineering, Physics, Computer Science, or a related field
• 2+ years of experience in software engineering or a related field
• Demonstrated development experience in Python and C++
• Working knowledge of physics-based modeling, numerical methods, or control systems
• Demonstrated proficiency in a Linux environment and with bash scripting
• Demonstrated proficiency with Git and modern Agile software development practices and tools

Technologies you’ll work with

• Python, C++, Linux
• bash scripting, Git, GitLab CI/CD
• CAN, SpaceWire, RS-422
• Docker, CI/CD
• Software-in-the-Loop (SITL), Hardware-in-the-Loop (HITL)
• UDP/TCP

Desired qualifications

• Coursework or experience in orbital mechanics, attitude dynamics, or GN&C
• Experience emulating hardware interfaces or spacecraft bus protocols such as CAN, SpaceWire, or RS-422
• Experience writing performance-sensitive simulation or real-time software
• Experience validating models against test or flight data
• Experience designing and working with APIs
• Familiarity with spacecraft flight software and avionics architectures
• Experience with Docker and containerization
• Experience with CI/CD pipelines, especially GitLab CI/CD
• Experience with Software-in-the-Loop (SITL) and/or Hardware-in-the-Loop (HITL) test systems
• Experience with end-to-end, system-level automated testing
• Experience with agentic or AI-assisted software development workflows
• Ability to interface with and handle flight hardware
• Familiarity with the space domain and satellite operations
• Networking concepts like UDP/TCP
• Active Top Secret security clearance or ability to obtain

Role details

• Location: Greenwood Village, CO (onsite)
• Compensation: USD 110,000 - 190,000 per year
• Experience: 2+ years
• Education: Bachelor's degree or greater

Benefits

• Medical, dental, and vision insurance
• PTO
• 401K