Software Developer SME, TS​/SCI FS Poly

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

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.

• 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 (Type Script), 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

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

• Java
• Spring Boot
• Angular (Type Script)
• 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

• 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
• AWS certification

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.

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

Referrals increase your chances of interviewing at Lion Federal by 2x.

Mid‑Senior level

Full‑time

Engineering and Information Technology