Concept Solutions, LLC (CS) is seeking an experienced
Senior Software Engineer - Go (Golang) to support a mission-critical application modernization program for a Department of War (DoW) customer.
This program is focused on simplifying access across a portfolio of production applications through a unified sign-on experience, a shared user interface, and a repeatable approach to integrating applications into a common platform.
In this role, you will help maintain and enhance high-volume, public-facing applications while supporting their integration into a modernized platform. The ideal candidate brings strong backend engineering expertise, hands-on production experience with Go, and the ability to troubleshoot, maintain, and securely deploy applications in a cloud environment.
Application Sustainment & Engineering
- Maintain and support a high-volume, public-facing application built with Go, React/TypeScript, and PostgreSQL, containerized on Amazon ECS.
- Hold privileged access to production environments and take ownership of application defects, security patches, and releases in accordance with the customer's release calendar.
- Troubleshoot production issues and implement application fixes to ensure reliability, performance, and availability.
- Maintain application runbooks, operational documentation, and the established sustainment baseline.
- Participate in the Severity 1 on-call rotation and address security vulnerabilities and findings.
Application Modernization & Integration
- Develop and implement application-side changes necessary to integrate existing applications with the shared modernization platform.
- Support identity-provider trust integration, deep-link routing, redemption endpoints, and data feed access.
- Collaborate with engineering and platform teams to maintain existing application functionality during modernization.
- Follow established change management and privileged-access procedures when deploying updates to production environments.
Requirements
- 7+ years of professional backend software engineering experience, including at least 3 years of production Go (Golang) development.
- Strong experience developing and maintaining REST APIs.
- Hands-on experience with SQL and PostgreSQL databases.
- Experience operating and supporting production applications in a cloud environment.
- Familiarity with formal change control processes and privileged-access security requirements.
- Ability to troubleshoot complex production issues, implement fixes, and support application releases.
Preferred Qualifications
- Experience with React and TypeScript.
- Experience with Amazon ECS or Kubernetes.
- Familiarity with AWS GovCloud environments.
- Experience integrating applications with identity providers using OIDC or SAML.
- Current favorably adjudicated Tier 5 investigation or active Top Secret clearance, enabling immediate privileged access.
Work Location and Schedule
- Location: Hybrid. Work may be performed at Concept Solutions' 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.
- Government-furnished equipment will be used for all access to government environments.
- Schedule: Full-time, 40 hours per week, Monday through Friday, with core hours of 9:00 a.m.-3:00 p.m. Eastern. Work follows two-week Agile sprints, including customer demonstrations each sprint.
- Travel: 0-10%, within the Washington, DC metropolitan area.
- Security Requirement: U.S. citizenship is required. This is a privileged-access position. 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.
- Compensation: $170,000-$180,000 annually, depending on experience.
Contract Status: This position is contingent upon contract award, with an anticipated start in October 2026.
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.
