Senior Software Engineer

Leidos is hiring a Senior Software Engineer for the Chinook program supporting an Intelligence Community (IC) customer. This hybrid role is based in Tucson, AZ (with additional locations available) and focuses on building and improving mission-critical web, mobile, and backend systems in a secure Agile environment.

Enjoy opportunities to work across the full stack, collaborate with DevSecOps on CI/CD and monitoring, and contribute directly to sprint delivery through hands-on engineering and Scrum facilitation. The role also requires an active Top Secret/SCI clearance and the ability to successfully complete a polygraph examination.

Responsibilities

• Design, develop, test, and maintain scalable, secure web and mobile applications supporting mission-critical requirements.
• Build responsive front-end applications using Next.js, React.js, JavaScript, and CSS, and develop backend services and RESTful APIs using Python and Django.
• Develop and maintain content management solutions using Wagtail CMS, and optimize PostgreSQL databases for performance and data integrity.
• Support cross-platform mobile development with React Native and native iOS development using Swift, SwiftUI, UIKit, Xcode, and the Apple iOS SDKs, ensuring integration with backend services.
• Write clean, maintainable code; perform peer reviews; troubleshoot complex issues; and implement unit, integration, and automated testing.
• Develop, deploy, and maintain secure, scalable applications within Amazon Web Services (AWS).
• Collaborate with DevSecOps engineers to support CI/CD pipelines, Docker deployments, cloud infrastructure, and application monitoring.
• Troubleshoot application and infrastructure issues while ensuring performance, reliability, and compliance with customer security requirements.
• Act as a hands-on software engineer while facilitating Scrum ceremonies, including sprint planning, daily standups, backlog refinement, sprint reviews, and retrospectives.
• Work with Product Owners, developers, and customer stakeholders to establish sprint goals, prioritize work, and align software delivery with mission needs.
• Remove team-level impediments, manage technical dependencies, and address risks that impact sprint execution and delivery commitments.
• Champion Agile best practices, contribute to continuous improvement, and support team accountability and collaboration.
• Use Jira for sprint and backlog management, GitLab for source control and collaboration, and Rocket.Chat for communication.

Requirements

• US citizenship required per contract.
• Bachelor’s degree in Computer Science, Software Engineering, or related field and 8-12 years of relevant experience, or Master’s with 6-10 years; doctorate may be considered in the technical domain. Equivalent experience may be considered in lieu of degree.
• Active Top Secret/SCI with the ability to successfully pass a Polygraph examination.
• 5+ years hands-on experience designing, developing, and maintaining modern web and mobile applications.
• Strong proficiency in JavaScript, React.js, Next.js, HTML, and CSS, plus Python and Django for backend services and RESTful APIs.
• Experience with Wagtail CMS (or similar) and PostgreSQL (or comparable relational databases).
• Experience developing cross-platform mobile apps using React Native and native iOS apps using Swift, SwiftUI, UIKit, Xcode, and iOS SDKs.
• Experience developing, deploying, and maintaining applications in AWS, including familiarity with S3, ECS, RDS, CloudFront, and Application Load Balancers (ALB).
• Experience with Docker, Git-based source control, GitLab, and CI/CD development and deployment practices.
• Familiarity with Kubernetes and container orchestration concepts for deploying, managing, and scaling containerized applications.
• Demonstrated Agile/Scrum experience, including facilitating ceremonies, removing impediments, and contributing hands-on software development.
• Experience using Jira (or comparable Agile tools) for managing backlogs, user stories, defects, and sprint progress.
• Strong understanding of secure coding, automated testing, code reviews, software integration, and troubleshooting across full-stack applications.
• Excellent communication, problem-solving, and collaboration skills across Product Owners, developers, and customer stakeholders.

Technologies

• Next.js, React.js, JavaScript, CSS
• Python, Django, RESTful APIs
• Wagtail CMS, PostgreSQL
• React Native, Swift, SwiftUI, UIKit, Xcode, Apple iOS SDKs
• Amazon Web Services (AWS): S3, ECS, RDS, CloudFront, Application Load Balancers (ALB)
• Scrum ceremonies, Jira, GitLab, Rocket.Chat
• Docker, CI/CD, Kubernetes

Benefits

• Health and Wellness programs
• Income Protection
• Paid Leave and Retirement

Clearance

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

Preferred Qualifications

• Experience supporting software development programs within the DoD or IC.
• CSM, PSM, SSM, or equivalent Agile certification.
• Experience serving as a Scrum Master or Agile technical lead using Agile metrics to improve sprint execution, team performance, and software delivery.
• Experience mentoring developers, conducting technical reviews, and collaborating directly with government customers in mission-critical environments.
• Advanced experience with Next.js, React.js, Django REST Framework, Wagtail CMS, and PostgreSQL, including performance optimization and complex application integrations.
• Experience developing, deploying, and maintaining native iOS applications using Swift, SwiftUI, UIKit, and Xcode, including application signing, provisioning, debugging, and release management.
• Experience integrating React Native with native iOS components and developing mobile applications for both iOS and Android.
• Experience configuring and optimizing AWS ECS, S3, RDS, CloudFront, and ALB, including container orchestration, caching, security, and application performance.
• Experience with GitLab CI/CD, infrastructure-as-code tools such as Terraform or CloudFormation, and automated testing frameworks such as Playwright, Jest, or Pytest.
• Experience developing secure, accessible, high-availability public-facing applications and enterprise content management solutions.

Location

• Tucson, AZ (hybrid)
• Gaithersburg, MD
• Alexandria, VA
• Chantilly, VA

Pay Range: $107,900.00 - $195,050.00

Original Posting: October 19, 2026