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Software Engineer SME

Leidos


Job Location:

Saint Louis, MI - USA

Yearly Salary: USD 131300 - 237350
Posted: 12 September 2026 (1 hour ago)
Application Deadline: 10 December 2026
Vacancies: 1 Vacancy

Job Summary

Join a Mission That Matters!

Are you a highly skilled Software Engineer ready to tackle complex technical challenges that directly support our nations intelligence mission Leidos is seeking an accomplished Software Engineer Subject Matter Expert (SME) to join the Chinook Program supporting our Intelligence Community customer.

This is an exciting opportunity to bring your software engineering expertise to a high-impact mission where innovation technical excellence and teamwork make a real difference. You will work alongside talented engineers architects mission experts and government stakeholders to develop and deliver secure scalable and modern software capabilities that support critical national security objectives.

As a Software Engineer SME you wont simply be writing code youll help shape technical solutions influence architecture solve challenging engineering problems and elevate the capabilities of the team around you. We are looking for a hands-on technical leader who thrives in a collaborative environment and is excited about applying modern software engineering practices to meaningful mission challenges.

In this role you will provide hands-on technical leadership across the full software development lifecycle designing developing integrating testing deploying and maintaining mission-critical applications and services. The SME will serve as a senior technical authority within the development team helping establish sound engineering practices resolve complex technical challenges mentor other engineers and collaborate closely with government and contractor stakeholders.

Position may be performed in the following locations below.

  • Gaithersburg MD
  • Alexandria VA
  • Chantilly VA
  • Englewood CO
  • St. Louis MO
  • Tucson AZ
Clearance Level Required:

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

Primary Responsibilities:

  • Serve as the senior technical SME and technical advisor for mission applications under the Chinook program.
  • Design develop integrate test deploy and maintain modern web applications and backend services.
  • Develop scalable maintainable and secure software across both front-end and back-end tiers.
  • Translate mission and technical requirements into robust software architecture and implementation plans.
  • Provide technical leadership in software design architecture coding standards code reviews and engineering best practices.
  • Develop and maintain RESTful APIs microservices data services and system integrations.
  • Build responsive and user-focused front-end interfaces using modern web development frameworks
  • Design and optimize database schemas queries data-access layers and data-processing workflows.
  • Troubleshoot complex application integration performance and production issues.
  • Support automated testing continuous integration/continuous delivery (CI/CD) and DevSecOps practices.
  • Contribute to containerized and cloud-enabled application environments as applicable to the program.
  • Participate in Agile/Scrum ceremonies sprint planning backlog refinement demonstrations and technical working sessions.
  • Mentor junior and mid-level software engineers and promote consistent engineering practices across the team.
  • Identify opportunities to improve application performance reliability security scalability and maintainability.
  • Evaluate emerging technologies and recommend solutions based on mission requirements and technical feasibility.

Basic Qualifications:

  • US citizenship is required per contract.
  • Bachelors degree in Computer Science Software Engineering or related field and 12-15 years of prior relevant experience or Masters with 10-13 years of prior relevant experience.
  • Proficient with the following technologies:
    • Web: HTML CSS JSON and REST APIs
    • Object-oriented Programming:Python Java and JavaScript
    • Advanced Programming: Go
    • Front-end and Back-end Frameworks: React Angular jQuery Spring Boot Django Flask or Svelte.
    • Cloud Development:
      • Multi-cloud architectures: AWS IBM Google Azure and Oracle.
      • Specific AWS Services: S3 SQS SNS EC2 CloudFormation and RDS
    • Relational Database:MySQL PostgreSQL or SQL Server
    • NoSQL Database: OpenSearch/Elasticsearch.
    • Operating System: Windows Linux
    • Version Control System:Git
  • Proficiency with AWS (C2S/GovCloud) and Infrastructure-as-Code (Terraform CloudFormation).
  • Established experience building and deploying containerized services (Docker/Kubernetes).
  • Solid understanding of DevSecOps tools: GitLab CI/CD Jenkins SonarQube Nexus Keycloak Vault.
  • In depth knowledge of Agile/Scrum practices and tools (JIRA Confluence)
  • Solid understanding of customer specific data types and standards such as OGC WMS/WFS NSG and GEOINT workflows.

Preferred Qualifications:

  • Frontend Web Development: UI/UX
  • Prior experience supporting Intelligence Community mission systems.
  • Experience with messaging/event-driven architecture.
  • Experience with observability logging monitoring and application performance management.
  • Advanced certifications such as AWS Certified Developer or Solutions Architect CISSP SAFe Agile or similar.

#Chinook

#NSBA

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

Original Posting:
September 10 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 $131300.00 - $237350.00

The Leidos pay range for this job level is a general guideline onlyand 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.


Required Experience:

IC


About Company

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Leidos is an innovation company rapidly addressing the world's most vexing challenges in national security and health. Our 47,000 employees collaborate to create smarter technology solutions for customers in these critical markets.

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