Senior Integration Engineer

CONCEPT SOLUTIONS LLC•Reston, VA

9d•$170,000 - $180,000•Remote

About The Position

Concept Solutions, LLC is seeking an experienced Senior Integration Engineer to support a mission-critical application modernization program for a Department of War customer. The program aims to streamline access across production applications through a unified platform that provides single sign-on, a common user experience, and a repeatable approach to application integration. The engineer will maintain and enhance integration services connecting the applications, using API gateways, legacy interfaces, and modern integration patterns. The role supports reliable system communication and continued operation of existing mission-critical applications. It is remote, full-time, Monday through Friday, with core hours from 9:00 a.m. to 3:00 p.m. Eastern. Work follows two-week sprints, each including a customer demonstration. Travel is 0–10% within the Washington, DC metropolitan area. U.S. citizenship is required, and the role involves privileged access. Candidates must hold a current favorably adjudicated Tier 5 investigation or Top Secret clearance, or be eligible to obtain one. Compensation is $170,000–$180,000 annually, depending on experience.

Requirements

At least 7 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.
A current favorably adjudicated Tier 5 investigation or active Top Secret clearance is required by the listed requirements.
U.S. citizenship is required.

Nice To Haves

Experience with Envoy, Debezium, MuleSoft, or similar integration technologies.

Responsibilities

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.