Senior Software Engineer

System One • Fort Belvoir, VA • 51min ago

Staff Software Engineer, Defense Applications Location: Fort Belvoir, Virginia - Onsite

Openings: 2

Clearance Requirement: Must have an active Secret clearance

Employment Type: Direct hire or temp to perm Position Overview System One IT is seeking two Staff Software Engineers to design and deliver mission-focused applications supporting a Department of Defense customer at Fort Belvoir, Virginia.

This is a senior, hands-on engineering opportunity for professionals who can own substantial software capabilities from initial architecture through production deployment. You will build user-facing applications, backend services, APIs, and data integrations while working directly with Army users and product designers.

The ideal candidate has strong full stack development experience, technical leadership capabilities, and experience building applications on Palantir Foundry or a comparable enterprise data platform. Responsibilities - Own the architecture, development, and delivery of user-facing defense applications

Build responsive web interfaces, backend services, APIs, and data integrations

Develop applications using Palantir Foundry capabilities and modern web frameworks

Collaborate directly with Army users and product designers to understand operational workflows and refine application capabilities

Establish and promote effective engineering practices for architecture, testing, code review, security, CI/CD, and production operations

Diagnose and resolve complex application, data, and integration issues across the technology stack

Mentor engineers and contribute to technical decisions across the broader platform

Maintain high standards for software quality, reliability, security, and maintainability Minimum Qualifications - Bachelor's degree in computer science, software engineering, or a related discipline, or equivalent practical experience

Eight or more years of professional software engineering experience

Strong proficiency with JavaScript or TypeScript, React, and modern web application development

Experience developing backend services, APIs, and data-intensive applications

Experience building applications on Palantir Foundry or a comparable enterprise data platform

Demonstrated ownership of a significant software capability from architecture through production deployment

Experience supporting a Department of Defense customer

Active Secret clearance Preferred Qualifications

Experience supporting the U.S. Army

Hands-on experience with Palantir Foundry, Army Vantage, OSDK, Workshop, or AIP

Experience developing applications with Python, Java, Go, or Node.js

Familiarity with Army acquisition or program management processes

Experience with cloud platforms, DevSecOps practices, CI/CD, and secure production environments

Experience using AI-assisted software development tools

System One, and its subsidiaries including Joulé and Mountain Ltd., are leaders in delivering outsourced services and workforce solutions across North America. We help clients get work done more efficiently and economically, without compromising quality. System One not only serves as a valued partner for our clients, but we offer eligible employees health and welfare benefits coverage options including medical, dental, vision, spending accounts, life insurance, voluntary plans, as well as participation in a 401(k) plan.

System One is an Equal Opportunity Employer. All qualified applicants will receive consideration for employment without regard to race, color, religion, sex (including pregnancy, childbirth, or related medical conditions), sexual orientation, gender identity, age, national origin, disability, family care or medical leave status, genetic information, veteran status, marital status, or any other characteristic protected by applicable federal, state, or local law.

M1

LI-CS1

Ref: #851-Rockville-S1

System One, and its subsidiaries including Joulé, ALTA IT Services, CM Access, TPGS, and MOUNTAIN, LTD., are leaders in delivering workforce solutions and integrated services across North America. We help clients get work done more efficiently and economically, without compromising quality. System One not only serves as a valued partner for our clients, but we offer eligible full-time employees health and welfare benefits coverage options including medical, dental, vision, spending accounts, life insurance, voluntary plans, as well as participation in a 401(k) plan.

System One is an Equal Opportunity Employer. All qualified applicants will receive consideration for employment without regard to race, color, religion, sex (including pregnancy, childbirth, or related medical conditions), sexual orientation, gender identity, age, national origin, disability, family care or medical leave status, genetic information, veteran status, marital status, or any other characteristic protected by applicable federal, state, or local law.

Go to Apply

Principal Full Stack Software Engineer

General Dynamics Information Technology • Arlington, VA • 8h ago

IT & Engineering

Req ID: RQ228159 Type of Requisition: Regular Clearance Level Must Be Able to Obtain: Top Secret SCI + Polygraph Public Trust/Other Required: None Job Family: Software Engineering Skills: CI/CD,Git,Python (Programming La...

8h ago

Go to Apply

Principal Full Stack Software Engineer

General Dynamics Information Technology • Arlington, VA • 8h ago

IT & Engineering

Req ID: RQ228167 Type of Requisition: Regular Clearance Level Must Be Able to Obtain: Top Secret SCI + Polygraph Public Trust/Other Required: None Job Family: Software Engineering Skills: CI/CD,Git,Python (Programming La...

8h ago

Go to Apply

Senior Principal Agentic AI Full Stack Software Engineer

General Dynamics Information Technology • Arlington, VA • 8h ago

IT & Engineering

Req ID: RQ228169 Type of Requisition: Regular Clearance Level Must Be Able to Obtain: Top Secret SCI + Polygraph Public Trust/Other Required: None Job Family: Data Science and Data Engineering Skills: AI Agents,AI Ops,AI...

8h ago

Go to Apply

NCIS Systems Administrator | Active Top Secret clearance

General Dynamics Information Technology • Quantico, VA • 8h ago

IT & Engineering

Req ID: RQ228006 Type of Requisition: Regular Clearance Level Must Be Able to Obtain: Top Secret/SCI Public Trust/Other Required: None Job Family: IT Infrastructure and Operations Skills: IT System Administration,Mobile...

8h ago

Go to Apply

Subscribe to get new jobs sent directly to you
(no charge, cancel anytime)