Senior Software Engineer

Leidos•Alexandria, VA

1d•$107,900 - $195,050•Hybrid

About The Position

Leidos is seeking a hands-on Senior Software Engineer for the Chinook program supporting an Intelligence Community customer. The role combines full-stack software engineering with Agile team leadership to design, build, and enhance secure web and mobile applications that provide reliable access to mission-essential information and services. The position is hybrid, combining onsite collaboration with remote work. Gaithersburg, Maryland, is the program’s primary work location; other listed locations are Alexandria and Chantilly, Virginia, and Tucson, Arizona. The engineer will build responsive front ends with Next.js, React.js, JavaScript, and CSS; backend services and REST APIs with Python and Django; content-management solutions with Wagtail; and mobile applications with React Native and native iOS technologies. The role also includes PostgreSQL database work and developing and maintaining cloud-hosted solutions on AWS. Alongside hands-on development, the engineer facilitates Scrum ceremonies, supports sprint execution, removes team-level impediments, and promotes continuous improvement. They work with developers, Product Owners, and customer stakeholders to align delivery with mission needs. The position requires U.S. citizenship and an active Top Secret/SCI clearance, with the ability to pass a polygraph examination.

Requirements

U.S. citizenship is required by the contract.
Bachelor’s degree in Computer Science, Software Engineering, or a related field and 8–12 years of relevant experience, or a master’s degree and 6–10 years of relevant experience; a doctorate in a technical domain may be held. Equivalent experience may be considered in lieu of a degree.
Active Top Secret/SCI clearance and ability to successfully pass a polygraph examination.
At least 5 years of hands-on experience designing, developing, and maintaining modern web and mobile applications.
Proficiency in JavaScript, React.js, Next.js, HTML, and CSS for front-end development, and Python and Django for backend services and RESTful APIs.
Experience with Wagtail CMS or comparable content-management frameworks and PostgreSQL or similar relational databases.
Experience developing cross-platform mobile applications with React Native and native iOS applications 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.
Experience with Docker, Git-based source control, GitLab, and CI/CD development and deployment practices.
Familiarity with Kubernetes and container-orchestration concepts, including deploying, managing, and scaling containerized applications in cloud environments.
Demonstrated Agile/Scrum experience, including facilitating ceremonies, supporting sprint execution, removing impediments, and contributing hands-on software development.
Experience using Jira or comparable Agile project-management tools to manage backlogs, user stories, defects, and sprint progress.
Strong understanding of secure coding, automated testing, code reviews, software integration, and full-stack troubleshooting.
Strong communication, problem-solving, and collaboration skills, including the ability to work effectively with Product Owners, developers, and customer stakeholders.

Nice To Haves

Experience supporting software-development programs within the Department of Defense or Intelligence Community.
Certified Scrum Master (CSM), Professional Scrum Master (PSM), SAFe Scrum Master (SSM), or equivalent Agile certification.
Experience serving as a Scrum Master or Agile technical lead and 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 with 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 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.

Responsibilities

Design, develop, test, and maintain scalable, secure web and mobile applications for mission-critical customer 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.
Develop and support cross-platform mobile applications using React Native and native iOS applications using Swift, SwiftUI, UIKit, Xcode, and Apple iOS SDKs, integrating them with backend services.
Write maintainable code, conduct peer reviews, troubleshoot complex issues, and implement unit, integration, and automated testing.
Develop, deploy, and maintain secure, scalable applications in AWS.
Collaborate with DevSecOps engineers on CI/CD pipelines, Docker deployments, cloud infrastructure, and application monitoring.
Troubleshoot application and infrastructure issues while maintaining performance, reliability, and compliance with customer security requirements.
Facilitate Scrum ceremonies, including sprint planning, daily standups, backlog refinement, sprint reviews, and retrospectives, while continuing to contribute hands-on as an engineer.
Work with Product Owners, developers, and customer stakeholders to establish sprint goals, prioritize work, and align delivery with mission requirements.
Identify and remove team-level impediments, manage technical dependencies, and address risks affecting sprint execution and delivery commitments.
Promote Agile practices, collaboration, accountability, and continuous improvement.
Use Jira for sprint and backlog management, GitLab for source control and collaborative development, and Rocket.Chat for customer and team communication.