Senior Java Software Engineer

Concept Solutions, LLC (CS) is seeking an experienced Senior Java Software Engineer to support a mission-critical application modernization program for a Department of War (DoW) customer.

This initiative focuses on creating a unified platform that provides seamless access across multiple production applications through a single sign-on experience, a shared user interface, and a standardized approach to application integration.

The selected candidate will play a key role in sustaining existing applications while implementing enhancements that enable their integration into the modernized platform. This position requires strong enterprise Java development expertise, production application support experience, and the ability to work within secure, cloud-based environments.

• Maintain and support a production application built with Java Spring Boot, React, and PostgreSQL, containerized using AWS ECS/Fargate.
• Manage application defects, security patches, and production releases while maintaining system reliability.
• Support API Gateway synchronization with a Pega-based status tracking system.
• Implement application-side integrations with the modernization platform, including identity-provider trust, deep linking, redeem endpoints, and feed access.
• Maintain operational runbooks and application sustainment baselines.
• Participate in the Severity 1 on-call rotation to address critical production incidents.
• Identify and remediate security findings to maintain compliance and operational readiness.

• 7+ years of experience in enterprise Java development using Spring Boot.
• Strong experience with SQL, PostgreSQL, and RESTful APIs.
• Experience operating and supporting production applications in cloud environments.
• Familiarity with formal change management processes and privileged-access security controls.

• Experience with React.
• Experience with AWS ECS/Fargate and AWS Gov Cloud.
• Experience integrating applications with Pega.
• Current favorably adjudicated Tier 5 investigation or active Top Secret clearance.

• Location:
  
  Hybrid. Based at CS headquarters in Reston, VA, and approved remote locations within the United States, with on-site work at Government facilities in Northern Virginia and Maryland as required.
• Schedule:
  
  Full-time, 40 hours per week, Monday through Friday, with core hours from 9:00 a.m. to 3:00 p.m. Eastern.
• Development Cycle:
  Two-week sprints, including a customer demonstration each sprint.
• Travel: 0–10% within the Washington, DC metropolitan area.
• Security Requirement: U.S. citizenship required. Candidates must hold a current favorably adjudicated Tier 5 investigation or Top Secret clearance, or be eligible to obtain one. An active clearance may allow for an earlier start.
• Government Systems Access:
  Government-furnished equipment is required for all access to Government environments.
• Compensation: $170,000–$180,000 base salary, depending on experience.
• This position is contingent upon contract award, with an anticipated start in October 2026.

Company Profile:

Founded in 1999 and headquartered in Reston, Virginia, Concept Solutions, LLC (CS) is a leading small business in technology, engineering, and management consulting. We are the innovative and agile force behind strategic solutions that enhance organizational efficiency and safeguard our nation across Aerospace, Defense, and National Security sectors.

For over 25 years, CS has been a trusted partner for the Federal Aviation Administration (FAA), Department of Homeland Security (DHS), Department of Justice (DOJ), Department of Defense (DoD) and other federal agencies delivering vital IT, security, and project management services.

Our commitment to excellence…