Senior Integration Engineer

Fully Remote
• Reston, VA Description

Concept Solutions, LLC (CS) is seeking an experienced Senior Integration Engineer to support a mission-critical application modernization program for a Department of War (DoW) customer.

This initiative will modernize and streamline access across a portfolio of production applications by establishing a unified platform with single sign-on, a common user experience, and a repeatable approach to integrating applications.

As a Senior Integration Engineer, you will play a key role in maintaining and enhancing the integration services that connect these applications. You will work with API gateways, legacy interfaces, and modern integration patterns to ensure reliable communication between systems while supporting the continued operation of existing mission-critical applications.

Maintain privileged access to integration services and API gateways connecting the application portfolio.

Troubleshoot and resolve integration incidents, defects, and connectivity issues to ensure system reliability and continuity.

Maintain integration contracts, correlation identifiers, and acknowledgment mechanisms across connected systems.

Establish and maintain OpenAPI contracts at the platform gateway to standardize existing integrations.

Support the platform team's data feeds and integration requirements.

Work with legacy interfaces and existing application integrations to support modernization without disrupting ongoing operations.

Requirements7+ years of experience in integration engineering, including REST APIs, OpenAPI specifications, API gateways, and message-based or Change Data Capture (CDC) integration patterns.

Demonstrated experience working with legacy interfaces and integrating systems developed by other teams or vendors.

Ability to troubleshoot complex integration issues and support production application environments.

Current favorably adjudicated Tier 5 investigation or active Top Secret clearance.

Preferred Qualifications

Experience with Envoy, Debezium, Mule Soft, or similar integration technologies.

Work Location and Schedule

Location:

Remote

Schedule:

Full-time, Monday through Friday, with core hours of 9:00 a.m. to 3:00 p.m. Eastern. Work follows two-week sprints, with a customer demonstration each sprint.

Travel: 0–10%, within the Washington, DC metropolitan area.

Security Requirement: U.S. citizenship required. This is a privileged-access role. Candidates must hold a current favorably adjudicated Tier 5 investigation, hold a Top Secret clearance, or be eligible to obtain one. An active clearance

Compensation: $170,000–$180,000 annually, 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…