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Leidos

Senior Systems Integrator Engineer

St. Louis, MO$107,900 – $195,050Posted 23 days ago

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Description

Bring Complex Systems Together for a Mission That Matters

Great systems don't happen by accident, they happen when talented engineers can see the big picture, understand how complex technologies interact, and turn that understanding into reliable mission capabilities. Leidos is seeking an experienced Senior Systems Integration Engineer to join the Chinook Program supporting an Intelligence Community (IC) customer and an application supporting important national security objectives.

As a Senior Systems Integration Engineer, you'll be at the center of complex technical integration connecting applications, services, infrastructure, data, interfaces, and mission capabilities into a cohesive operational solution. You'll work across engineering disciplines to identify integration challenges early, lead technical troubleshooting, and ensure capabilities work together as intended.

The Senior Systems Integration Engineer will provide technical leadership for the integration of software, hardware, infrastructure, data, and mission capabilities supporting the application. The engineer will work closely with software engineering, systems engineering, DevSecOps, test engineering, security, architecture, program management, and customer stakeholders to plan, execute, troubleshoot, and validate complex system integrations.

Position may be performed in the following locations below.

• Tucson, AZ

• Gaithersburg, MD

• Alexandria, VA

• Chantilly, VA

• Englewood, CO

• St. Louis, MO

Clearance Level Required:

Active Top Secret/SCI with the ability to successfully pass a Polygraph examination.

Primary Responsibilities:

• Lead integration activities across applications, infrastructure, data, network, security, and mission-system components.

• Develop and maintain system integration strategies, plans, procedures, and technical documentation.

• Analyze system and software requirements to identify integration dependencies, interfaces, constraints, and risks.

• Define and document system interfaces and integration requirements.

• Coordinate integration activities across multiple Agile engineering teams.

• Lead technical integration working sessions and troubleshoot complex cross-system issues.

• Develop integration approaches for APIs, microservices, databases, messaging systems, and external interfaces.

• Coordinate environments and technical dependencies required for integration and testing.

• Support end-to-end system integration and validation activities.

• Partner with Test Engineering to develop integration and end-to-end test strategies.

• Investigate defects and integration failures and lead root-cause analysis.

• Analyze logs, application behavior, interfaces, data flows, and system configurations to isolate issues.

• Coordinate resolution of integration defects across engineering teams.

• Support deployment, release, and operational readiness activities.

• Evaluate technical impacts associated with application changes, infrastructure changes, and new capabilities.

• Identify integration risks and dependencies early and communicate them to engineering and program leadership.

• Maintain integration schedules, technical dependencies, and readiness criteria.

• Support Agile ceremonies, PI Planning, backlog refinement, sprint planning, and technical demonstrations.

• Participate in architecture and technical design reviews.

• Provide technical guidance and mentorship to less-experienced systems and integration engineers.

• Collaborate with customer and mission stakeholders to understand operational integration requirements.

• Support continuous improvement of integration processes, tooling, automation, and engineering practices.

Basic Qualifications:

• US citizenship is required per contract.

• Bachelor's degree in Computer Science, Software Engineering, or related field and 8-12 years of prior relevant experience or Master's with 6-10 years of prior relevant experience. May possess a Doctorate in technical domain. Equivalent experience may be considered in lieu of degree.

• Demonstrated experience with systems integration, software integration, or complex enterprise application environments.

• Experience analyzing system interfaces, dependencies, data flows, and integration requirements.

• Experience troubleshooting complex technical issues across multiple systems or applications.

• Experience with REST APIs, web services, databases, messaging, and distributed systems.

• Experience working in Agile/Scrum environments.

• Experience with requirements management and technical documentation.

• Experience collaborating across software, infrastructure, security, test, and systems engineering teams.

Preferred Qualifications:

• Experience supporting Intelligence Community (IC) or DoD mission systems.

• Experience with geospatial, intelligence, or other mission-specific data and workflows.

• Experience with AWS and cloud environments.

• Experience with containerization (Docker, Kubernetes).

• Experience with CI/CD and DevSecOps environments.

• Experience with Infrastructure-as-Code (Terraform, Ansible, CloudFormation).

• Experience with GitLab CI/CD, Jenkins, SonarQube, Nexus, Vault, or Keycloak.

• Experience with PostgreSQL, MySQL, SQL Server, OpenSearch/Elasticsearch, or similar technologies.

• Experience with Kafka or other messaging/event streaming technologies.

• Experience with GitLab, Jenkins, Jira, Confluence, or similar tools.

• Experience with automated integration testing.

• Experience with system-of-systems integration.

#Chinook

#NSBA

If you're looking for comfort, keep scrolling. At Leidos, we outthink, outbuild, and outpace the status quo - because the mission demands it. We're not hiring followers. We're recruiting the ones who disrupt, provoke, and refuse to fail. Step 10 is ancient history. We're already at step 30 - and moving faster than anyone else dares.

Original Posting:

October 15, 2026

For U.S. Positions: While subject to change based on business needs, Leidos reasonably anticipates that this job requisition will remain open for at least 3 days with an anticipated close date of no earlier than 3 days after the original posting date as listed above.

Pay Range:

Pay Range $107,900.00 - $195,050.00

The Leidos pay range for this job level is a general guideline only and not a guarantee of compensation or salary. Additional factors considered in extending an offer include (but are not limited to) responsibilities of the job, education, experience, knowledge, skills, and abilities, as well as internal equity, alignment with market data, applicable bargaining agreement (if any), or other law.

About Leidos

Leidos is an industry and technology leader serving government and commercial customers with smarter, more efficient digital and mission innovations. Headquartered in Reston, Virginia, with 47,000 global employees, Leidos reported annual revenues of approximately $16.7 billion for the fiscal year ended January 3, 2025. For more information, visit www.Leidos.com.

Pay and Benefits

Pay and benefits are fundamental to any career decision. That's why we craft compensation packages that reflect the importance of the work we do for our customers. Employment benefits include competitive compensation, Health and Wellness programs, Income Protection, Paid Leave and Retirement. More details are available at www.leidos.com/careers/pay-benefits.

Securing Your Data

Beware of fake employment opportunities using Leidos' name. Leidos will never ask you to provide payment-related information during any part of the employment application process (i.e., ask you for money), nor will Leidos ever advance money as part of the hiring process (i.e., send you a check or money order before doing any work). Further, Leidos will only communicate with you through emails that are generated by the Leidos.com automated system - never from free commercial services (e.g., Gmail, Yahoo, Hotmail) or via WhatsApp, Telegram, etc. If you received an email purporting to be from Leidos that asks for payment-related information or any other personal information (e.g., about you or your previous employer), and you are concerned about its legitimacy, please make us aware immediately by emailing us at LeidosCareersFraud@leidos.com.

If you believe you are the victim of a scam, contact your local law enforcement and report the incident to the U.S. Federal Trade Commission.

Commitment to Non-Discrimination

All qualified applicants will receive consideration for employment without regard to sex, race, ethnicity, age, national origin, citizenship, religion, physical or mental disability, medical condition, genetic information, pregnancy, family structure, marital status, ancestry, domestic partner status, sexual orientation, gender identity or expression, veteran or military status, or any other basis prohibited by law. Leidos will also consider for employment qualified applicants with criminal histories consistent with relevant laws.

About Leidos

https://www.leidos.com/

Size: 10,000+ employees
Industry: Information Technology

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