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

Lion Federal

Chantilly (VA)

On-site

USD 120,000 - 150,000

Full time

14 days+

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Benefits offered by this job

Paid time-off

11 paid holidays

401(k) retirement plan with matching contribution

Health, dental, and vision insurance

Professional Development Budget

Job summary

A growing technology company in Chantilly, VA is seeking an experienced Software Developer SME to support critical systems for a federal client. The ideal candidate will have an active TS/SCI clearance and experience in cloud-based solution development, RESTful APIs, and full-stack applications. Responsibilities include software modernization and collaboration within Agile teams. This full-time position offers competitive benefits, including paid time off and comprehensive health insurance.

Qualifications

Active TS/SCI with Polygraph.
15+ years of experience (additional experience may be considered in lieu of a degree).

Responsibilities

Design, develop, and maintain software applications in cloud environments.
Modernize and transition legacy applications to cloud-based architectures.
Develop RESTful APIs and full-stack applications.
Collaborate with cross-functional teams using Agile/Scrum methodologies.
Mentor junior developers.

Skills

Java

Spring Boot

Angular (TypeScript)

Amazon Web Services (AWS)

Custom ETL development

Git

Jenkins

Selenium

Linux command-line

Education

Bachelor’s degree

Tools

AWS

Git

Jenkins

Selenium

Rundeck

Job description

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.

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
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