Senior Software Engineer

Leidos•Gaithersburg, MD

3d•Hybrid

About The Position

Leidos is seeking a hands-on Senior Software Engineer to support the Chinook program for an Intelligence Community customer. The role combines full-stack software engineering with Agile team leadership, developing modern web and mobile applications that provide reliable access to mission-essential information and services. The position is hybrid, with onsite collaboration and remote work; Gaithersburg, MD is the program’s primary work location, and other listed locations are Alexandria, VA; Chantilly, VA; and Tucson, AZ. The role requires an active Top Secret/SCI clearance and the ability to pass a polygraph examination. The engineer will lead one or more teams while contributing directly to software development. The work includes building responsive web experiences 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 engineer will also develop and maintain secure, scalable applications hosted on AWS and collaborate with DevSecOps engineers on CI/CD pipelines, Docker deployments, cloud infrastructure, and monitoring. In addition to engineering, the role facilitates Scrum ceremonies, supports sprint execution, removes team-level impediments, manages technical dependencies, and promotes collaboration and continuous improvement. The engineer works with developers, Product Owners, and customer stakeholders to align delivery with mission requirements. Jira, GitLab, and Rocket.Chat are used for project management, source control and collaboration, and communications.

Requirements

U.S. citizenship is required by the contract.
Active Top Secret/SCI clearance and ability to successfully pass a polygraph examination.
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 also be held. Equivalent experience may be considered in lieu of a degree.
At least 5 years of hands-on experience designing, developing, and maintaining modern web and mobile applications.
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.
Strong 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 using React Native and native iOS applications using Swift, SwiftUI, UIKit, Xcode, and iOS SDKs.
Experience developing, deploying, and maintaining AWS applications, 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, including deploying, managing, and scaling containerized applications in cloud environments.
Demonstrated experience in Agile/Scrum environments, including facilitating ceremonies, supporting sprint execution, removing impediments, and contributing hands-on software development.
Experience with Jira or comparable Agile project management tools for managing backlogs, user stories, defects, and sprint progress.
Strong understanding of secure coding, automated testing, code reviews, software integration, and full-stack troubleshooting.
Excellent 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 DoD or Intelligence Community.
Certified Scrum Master (CSM), Professional Scrum Master (PSM), SAFe Scrum Master (SSM), or equivalent Agile certification.
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 signing, provisioning, debugging, and release management.
Experience integrating React Native with native iOS components and developing 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.

Responsibilities

Lead teams in designing, developing, testing, and maintaining scalable, secure web and mobile applications for 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 Wagtail content management solutions and optimize PostgreSQL databases for performance and data integrity.
Develop and support cross-platform mobile applications with React Native and native iOS applications using Swift, SwiftUI, UIKit, Xcode, and Apple iOS SDKs; ensure integration 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 ensuring performance, reliability, and compliance with customer security requirements.
Facilitate Scrum ceremonies, including sprint planning, daily standups, backlog refinement, sprint reviews, and retrospectives, while continuing hands-on engineering work.
Work with Product Owners, developers, and customer stakeholders to set 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 team and customer communication.