Software Engineer

Concept Solutions, LLC; Reston (VA); Hybrid; USD 130,000 - 150,000; Full time

Job summary

Concept Solutions, LLC (CS) seeks a Software Engineer to support a mission-critical DoW modernization program. The role focuses on unifying experiences across applications with single sign-on and a shared platform.

You will maintain Java applications, ensure stability, and contribute to the modernization effort. The team will troubleshoot defects, implement patches on schedule, and document legacy capabilities.

Qualifications

• 3+ years of experience with Java, Spring Boot, and SQL.
• Ability to understand, troubleshoot, and modify existing code safely.
• Active Secret security clearance or higher (as required).

Responsibilities

• Troubleshoot and resolve defects in Java Spring Boot applications.
• Develop and implement patches according to the customer’s release schedule.
• Maintain and support existing applications during modernization initiatives.
• Ensure stability of legacy applications during retirement.
• Document legacy capabilities to support the successor system.
• Review and safely modify unfamiliar codebases.

Skills

Java

Spring Boot

SQL

Job description

Concept Solutions, LLC (CS) is seeking a 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.

What we're looking for

• 3+ years of experience working with Java, Spring Boot, and SQL.
• Demonstrated ability to understand, troubleshoot, and modify existing application code safely.
• Active Secret security clearance.

Preferred Qualifications

• Experience with Amazon ECS/Fargate and AWS GovCloud.

Work Location and Schedule

• Location: Remote
• Schedule: Full-time, 40 hours per week, Monday through Friday, with core hours from 9:00 a.m. to 3:00 p.m. Eastern. Work follows two-week sprints, including a customer demonstration each sprint.
• Travel: 0–10%, within the Washington, DC metropolitan area.
• Security Requirement: U.S. citizenship required. Must be eligible to obtain and maintain a DoD security clearance. An active Secret clearance or higher
• Compensation: $130,000–$150,000 base salary, depending on experience.

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 is reflected in our adherence to CMMI-DEV ML3, ISO 9001:2015, ISO/IEC 20000-1:2018, and ISO/IEC 27001-1:2013 standards. CS boasts company highlights that include:

• Over two decades of experience across over $300 million in contract awards supporting critical FAA programs
• Multiple contract vehicles providing opportunities across FAA, DoD, NOAA, and other Federal agencies
• Innovation Council - CS maintains an active Internal Research and Development (IR&D) program that is geared towards identifying emerging technologies and pursuing technological innovations

At CS, we know our success stems from our talented team. That’s why we prioritize the wellbeing and growth of our employees, fostering a positive culture centered on innovation, engagement, and career development.

Benefits: Concept Solutions offers a competitive benefits and salary package you would receive from a large company. We offer health, dental, vision and life insurance, as well as a comprehensive 401(k) plan with matching and immediate vesting.

Concept Solutions is an Equal Opportunity Employer, and we value workplace diversity. We invite resumes from all interested parties and consider applicants for all positions without regard to race, color, religion, sex, national origin, age, marital status, sexual preference, personal appearance, family responsibility, the presence of a non-job-related medical condition or physical disability, matriculation, political affiliation, veteran status, or any other legally protected status. Concept Solutions is a VEVRAA federal contractor, and we request priority referral of veterans for available positions.