BS or equivalent in Computer Science, Engineering, Mathematics, or similar
5+ years in aerospace or defense with proven software development
Experience customizing/automating STK tools or applications
Proficiency in Python with backend frameworks like Flask
Strong expertise in React JS for UI development
Familiar with version control systems, preferably Git
Active Top Secret (TS) clearance required
Responsibilities
Develop and maintain STK-based applications for mission analysis
Integrate STK with external tools and data sources
Implement backend services using Python; support frontend as needed
Analyze simulation results, delivering insights to teams
Ensure traceability between outputs and system models
Support deployment in modern environments like cloud
Contribute to documentation and user guides
Benefits
Opportunity for growth in a specialized field of aerospace and defense
Direct interaction with end-customers and leadership
Work in a dynamic, agile environment
Exposure to cutting-edge technologies and methodologies
Engage in meaningful mission analysis impacting national security
Full Job Description
NextGen Federal Systems, LLC is seeking a Software Engineer with experience in Systems Tool Kit (STK) to support the development and integration of mission analysis and modeling applications. These applications enable multi-domain analysis-including air, space, ground, and maritime systems-by leveraging physics-based modeling and simulation to assess system performance, coverage, communications, and operational effectiveness.
Responsibilities include software development, configuration, and execution; result interpretation; documentation; and modification and maintenance of tools and code. The selected candidate must be quick to learn, adaptable, and agile, interfacing directly with end-customers and customer leadership. The software engineer will provide a full range of systems and software engineering to support critical mission analyses.
Responsibilities
Develop, customize, and maintain STK-based applications to support mission planning, analysis, and visualization
Integrate STK (Engine, Components, or Desktop) with external tools, models, and data sources to enable end-to-end mission workflows
Implement backend services using Python and support frontend interfaces as needed
Analyze and interpret simulation results, providing actionable insights to engineering teams and stakeholders
Support traceability between mission analysis outputs and system models, ensuring consistency across the digital engineering environment
Support deployment and execution of applications in modern environments (e.g., containerized or cloud-based)
Contribute to documentation, user guides, and technical deliverables
Troubleshoot and enhance existing tools to improve performance, usability, and scalability
Qualifications
BS or equivalent in Computer Science, Engineering, Mathematics, or equivalent technical degree
5+ years' prior work experience in the aerospace or defense industry, with demonstrated software development experience
Experience customizing or automating STK-based tools or applications highly desired (including STK, STK Engine, STK Components, and/or Cesium)
Experience integrating tools via APIs (REST or similar)
Proficiency in Python and experience with backend frameworks such as Flask is required
Strong expertise in React JS for building modern and responsive user interfaces is highly desirable
Knowledge of version control systems, preferably Git is highly desirable
Proven experience as a Full Stack Developer or similar role is highly desirable
Capable of self-management and responsibly executing multiple tasks in accordance with priorities and deadlines
Active Top Secret (TS) clearance required (SCI eligibility preferred)
Preferred Qualifications
Experience with STK Engine, STK Components, or Cesium
Experience linking STK analyses to MBSE environments (e.g., parameter passing, trade studies, digital thread integration)
Familiarity with digital engineering ecosystems, mission thread development, or model orchestration tools
Experience with Docker, cloud environments, or DevSecOps practices
