NextGen Federal Systems

Federal IT solutions, software, cyber security

Senior Software Engineer

Full-Stack EngineeringConfirmed live in the last 24 hours

Full-timeBeavercreek, OH, USANo salary listedHybrid

About the Job

Requirements

A Bachelor of Science degree or equivalent in Computer Science, Engineering, Mathematics, or an equivalent technical degree.
At least 5 years of prior work experience in the aerospace or defense industry, with demonstrated software development experience.
Experience integrating tools via application programming interfaces, including REST or similar interfaces.
Proficiency in Python and experience with backend frameworks such as Flask.
An active Top Secret clearance is required.
The ability to self-manage and responsibly execute multiple tasks according to priorities and deadlines.

Responsibilities

Develop, customize, and maintain Systems Tool Kit-based applications for mission planning, analysis, and visualization.
Integrate Systems Tool Kit 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 and provide actionable insights to engineering teams and stakeholders.
Support traceability between mission analysis outputs and system models across the digital engineering environment.
Support deployment and execution of applications in containerized or cloud-based environments.
Contribute to documentation, user guides, and technical deliverables.
Troubleshoot and enhance existing tools to improve performance, usability, and scalability.

Desired Qualifications

Experience customizing or automating Systems Tool Kit-based tools or applications, including Systems Tool Kit, Systems Tool Kit Engine, Systems Tool Kit Components, or Cesium.
Strong expertise in React JavaScript for building modern and responsive user interfaces.
Knowledge of version control systems, preferably Git.
Proven experience as a Full Stack Developer or similar role.
SCI eligibility is preferred.
Experience with Systems Tool Kit Engine, Systems Tool Kit Components, or Cesium.
Experience linking Systems Tool Kit analyses to model-based systems engineering environments, including parameter passing, trade studies, and digital thread integration.
Familiarity with digital engineering ecosystems, mission thread development, or model orchestration tools.
Experience with Docker, cloud environments, or DevSecOps practices.
Frontend development experience, such as React.

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

Frontend development experience (e.g., React)

About NextGen:

NextGen Federal Systems is an innovative technology and professional services provider specializing in advanced software solutions and comprehensive mission and business support services. We work in close collaboration with our customers to truly understand their business and mission goals. Our approach is to design, build, implement, and manage solutions that measurably improve our client’s organizational performance. We have established and foster a corporate culture where we:

Treat employees with fairness and respect regardless of their position, sexual identity, race, or tenure.
Communicate the importance of our mission and our employees’ contributions to it, ensuring they understand how their job role contributes to the greater good.
Openly promote and communicate our ideas for change and adaptability.
Strive to achieve results as an organization.
Hold employees accountable to their commitments and provide incentives that encourage positive and productive behaviors.
Value the talents and contributions of our employees as the key factor for our success.
Create an environment where people can engage at all levels.
Encourage people to take risks and allow them to make mistakes.

Equal Opportunity Employer/Protected Veterans/Individuals with Disabilities.

About the Company

NextGen Federal Systems

Federal IT solutions, software, cyber security

NextGen Federal Systems provides IT solutions and services for the Department of Defense, federal agencies, and commercial clients, including software development, research and development, enterprise IT systems engineering, and cyber security and data management. Its offerings combine services and solution development delivered through agile, mature processes to produce working systems that analysts and warfighters rely on, while maintaining cost-effective delivery. The company differentiates itself with ISO 9001 certification, CMMI-DEV and CMMI-SVC Level 3 appraisals, government-domain focus, rapid growth, and a blended services/solutions model across multiple U.S. offices. Its goal is to tackle complex defense and intelligence challenges by providing reliable, secure, and scalable IT solutions that meet mission needs.

Company size: 201-500
Company stage: Grant
Total funding: $2.6M
Headquarters: Morgantown, WV
Founded: 2011

Recently Posted Jobs

Explore more opportunities at NextGen Federal Systems

See more jobs