Java Software Engineer

Concept Solutions, LLC

. Support a mission-critical application modernization program for a Department of War customer .

Posted 10/13/2026full-timeUnited StatesMid-LevelSenior💰 $130,000 - $150,000 per yearWebsite

Core Competencies

Role fit

Core Competencies

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Proficient in Java, Spring Boot, and SQL with a strong ability to troubleshoot and modify existing application code. Experienced in application modernization and maintaining legacy systems while ensuring compliance with security clearance requirements.

Highest-signal resume keywords

Java DevelopmentSpring Boot FrameworkSQL Database ManagementAmazon ECS/FargateActive Secret Security Clearance

ATS Keywords

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Applicant Tracking System Keywords

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Hard Skills

JavaSpring BootSQLApplication ModernizationCode TroubleshootingDefect ResolutionPatch DevelopmentLegacy Application MaintenanceCodebase ModificationDocumentation

Tools & Technologies

Amazon ECSAWS GovCloud

Certifications & Qualifications

Active Secret Security ClearanceDoD Security Clearance Eligibility

Industry Keywords

Department of WarGovernment FacilitiesNorthern VirginiaMarylandWashington, DC Metropolitan Area

Tech Stack

Tools & technologies

AWSJavaSpringSpring BootSpringBootSQL

About the role

Key responsibilities & impact

Support a mission-critical application modernization program for a Department of War customer
Troubleshoot and resolve defects in Java Spring Boot applications
Develop and implement patches according to the customer's established release schedule
Maintain existing applications while supporting transition to a modernized platform
Ensure stability of a legacy application through planned retirement without introducing enhancements
Document legacy application capabilities to support the successor system
Review, understand, and safely modify unfamiliar codebases
Participate in two-week sprints and customer demonstrations each sprint

Requirements

What you’ll need

3+ years of experience working with Java, Spring Boot, and SQL
Demonstrated ability to understand, troubleshoot, and modify existing application code safely
Experience with Amazon ECS/Fargate and AWS GovCloud preferred
Active Secret security clearance preferred
U.S. citizenship required
Must be eligible to obtain and maintain a DoD security clearance
Ability to work full-time, 40 hours per week, Monday through Friday
Ability to work core hours from 9:00 a.m. to 3:00 p.m. Eastern
Ability to work at Government facilities in Northern Virginia and Maryland as required
Ability to travel 0–10% within the Washington, DC metropolitan area

Benefits

Comp & perks

Health insurance
Dental insurance
Vision insurance
Life insurance
Comprehensive 401(k) plan with matching and immediate vesting
Positive culture centered on innovation, engagement, and career development
Government-furnished equipment for access to Government environments