Senior Software Engineer

Next Gen 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.

• 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.

• 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).

• 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 Dev Sec Ops  practices.
• Frontend development experience (e.g., React).

Equal Opportunity Employer/Protected Veterans/Individuals with Disabilities.