Java Software Engineer

Concept Solutions, LLC (CS) is seeking a Java Software Engineer to support a mission-critical application modernization program for a Department of War (DoW) customer. This position is contingent upon contract award, with an anticipated start in October 2026.

This program is focused on creating a unified experience across multiple production applications through single sign-on, a common work surface, and a scalable approach to integrating applications into a shared platform.

The successful candidate will help maintain and support existing Java applications while ensuring stability, reliability, and continuity throughout the modernization effort.

• Troubleshoot and resolve defects in Java Spring Boot applications.
• Develop and implement patches in accordance with the customer's established release schedule.
• Maintain existing applications while supporting the transition to a modernized platform.
• Ensure the stability of a legacy application through its planned retirement, without introducing enhancements.
• Document legacy application capabilities to support the successor system.
• Review, understand, and safely modify unfamiliar codebases.