Software Engineer – Go; Golang

Concept Solutions, LLC (CS) is seeking a Software Engineer – Go (Golang) to support a mission-critical application modernization program for a Department of War (DoW) customer.

This program focuses on simplifying access across a portfolio of production applications by creating a unified platform with single sign-on, a shared user interface, and a standardized approach to application integration.

The Software Engineer will play an important role in maintaining and enhancing existing applications while supporting the transition to a more integrated platform. This position is ideal for a backend engineer who enjoys solving complex problems, working with established codebases, and ensuring production systems remain reliable and secure.

• Application Sustainment & Engineering
• Troubleshoot and resolve software defects in production applications built with Go (Golang), React/Type Script, and PostgreSQL.
• Develop, test, and implement software patches and enhancements in accordance with the customer's release schedule.
• Maintain and improve automated tests to protect existing application functionality.
• Analyze unfamiliar codebases and implement changes safely without disrupting production operations.
• Maintain technical documentation, operational procedures, and system runbooks.
• Participate in an on-call support rotation following onboarding.

• 3+ years of backend software engineering experience, including production development using Go (Golang) and SQL.
• Demonstrated ability to troubleshoot, maintain, and enhance existing production applications.
• Experience working with unfamiliar or complex codebases and implementing changes safely.

Preferred Qualifications

Experience with Amazon ECS or Kubernetes.

Familiarity with AWS Gov Cloud environments.

Active Secret security clearance.

Eligibility for a Tier 5 background investigation.

Work Location and Schedule

Location:

Hybrid. Reston, VA headquarters 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 of 9:00 a.m.–3:00 p.m. Eastern.

Development

Schedule:

Two-week sprints with 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 security clearance. An active Secret clearance or higher is strongly preferred and may allow an earlier start.

Compensation: $130,000–$150,000 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 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…