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 provides IT solutions and services to the DoD, federal government, and commercial clients. It combines services and solution development in software development, R&D, enterprise IT systems engineering, and cyber security and data management, using agile, mature processes to deliver working systems. The company differentiates itself with a defense/government domain focus, ISO 9001 and CMMI Level 3 certifications, and a mixed services/solutions model that emphasizes cost-effective delivery. Its goal is to help analysts and warfighters meet mission needs by delivering reliable, secure, and scalable IT solutions while managing internal costs.

Company Size

201-500

Company Stage

Grant

Total Funding

$2.6M

Headquarters

Morgantown, West Virginia

Founded

2011

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Simplify's Take

What believers are saying

FY2026 YTD obligations reached $41.5 million across 41 federal actions by August 2026.
NextGen won a $14.1 million Air Force WA3S SBIR Phase III in May 2026.
A January 2026 DOJ order extends federal revenue through March 31, 2027.

What critics are saying

Federal spend is concentrated: DoD, DHS, and GSA drove 2026 obligations.
The $26.6 million DOJ OST contract ends in March 2027, creating renewal risk.
Losing GSA Schedule and OASIS+ access would collapse NextGen's federal pipeline.

What makes NextGen Federal Systems unique

DARPA selected NextGen for Space-WATCH on January 12, 2025, validating space-domain expertise.
Ansys named NextGen an official services partner in 2024 for Defense Intelligence.
NGA chose NextGen for eMTI, and the system reached production in AWS C2S.

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Benefits

Remote Work Options
Hybrid Work Options

Growth & Insights and Company News

6 month growth

-2%

1 year growth

2 year growth

SBIR.gov

Sep 13th, 2026

Awards | SBIR

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Intelligence Community News

Jan 14th, 2025

NextGen secures DARPA Space-WATCH contract

On January 12, NextGen Federal Systems (NextGen) announced the award of its first prime contract with the Defense Advanced Research Projects Agency (DARPA) for the Space-domain Wide Area Tracking and Characterization (Space-WATCH) program.

WV News

Jul 23rd, 2024

Morgantown, West Virginia's NextGen joins forces with Ansys as a services partner

By partnering with Ansys, NextGen Federal Systems enhances its ability to deliver innovative solutions tailored to the unique needs of each client, officials said.

NextGen Federal Systems