Demo

Software Developer SME, ACTIVE TS/SCI with FS Poly Required

Lion Federal
Chantilly, VA Full Time
POSTED ON 12/24/2025
AVAILABLE BEFORE 6/21/2026

📍 ACTIVE TS/SCI Clearance Required with FS Poly

Full-Time | On-site in Chantilly, VA | Cloud & Full-Stack Focus


Lion Federal is seeking an experienced Software Developer SME to support mission-critical systems for a federal client. This role focuses on modernizing legacy applications, building cloud-based solutions, and contributing to scalable, secure software in an Agile environment.


What You’ll Do


  • Design, develop, and maintain software applications in cloud environments (AWS)
  • Modernize and transition legacy applications to cloud-based architectures
  • Develop and maintain RESTful APIs and full-stack applications
  • Work with Java, Spring Boot, Angular (TypeScript), and Elasticsearch
  • Build and manage custom ETL processes
  • Write scripts to deploy and configure applications in EC2 environments
  • Collaborate with cross-functional teams using Agile/Scrum methodologies
  • Perform unit testing, peer code reviews, and automated testing (e.g., Selenium)
  • Support containerized and virtualized environments
  • Mentor junior developers and contribute to engineering best practices


Required Qualifications


  • Active TS/SCI with Polygraph
  • Bachelor’s degree plus 15 years of experience (additional experience may be considered in lieu of a degree)


Strong experience with:


  • Java
  • Spring Boot
  • Angular (TypeScript)
  • Amazon Web Services (AWS)
  • Experience developing solutions based on customer requirements and specifications
  • Hands-on experience with custom ETL development
  • Familiarity with Git, Jenkins, Selenium, and Rundeck
  • Comfortable working in Linux command-line environments


Preferred Qualifications


  • Experience with identity and accessibility development practices
  • Experience with automation and testing frameworks
  • Background in containerization and modular development
  • Familiarity with UI/UX design principles
  • Full-stack development experience
  • AWS certification


Why Lion Federal


Lion Federal is a fast-growing technology company supporting U.S. federal missions through secure, modern, and scalable solutions. We value strong engineering fundamentals, collaboration, and people who enjoy solving complex technical challenges.


Benefits

We provide a performance-based compensation plan along with great additional benefits. They include:

  • Paid time-off,
  • 11 paid holidays,
  • 401(k) retirement plan with matching contribution,
  • Comprehensive Health, dental, and vision insurance (100% paid by the company),
  • Direct deposit,
  • Professional Development Budget

Salary.com Estimation for Software Developer SME, ACTIVE TS/SCI with FS Poly Required in Chantilly, VA
$155,595 to $193,826
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