Senior Software Development Engineer In Test Jobs in Frederick, MD

This Department of War enterprise data and analytics program delivers mission-critical capabilities that enable leaders across the Department to make faster, better-informed decisions using trusted data at scale. Leidos Digital Modernization sector is seeking an experienced Senior Software Engineer to support the delivery, enhancement, and adoption of enterprise data and analytics products used across multiple DoD organizations.

In this role, you will work alongside government partners, engineers, and other industry teammates to translate operational and strategic requirements into scalable, production-ready solutions. You will contribute directly to product planning, execution, and continuous improvement-helping ensure capabilities are delivered efficiently, aligned to mission priorities, and positioned for sustained success.

This position offers the opportunity to work on a high-visibility, enterprise program at the intersection of data, analytics, and emerging AI technologies. Ideal candidates are motivated by mission impact, comfortable operating in complex stakeholder environments, and interested in building deep domain expertise while delivering capabilities with real-world national security outcomes.

Primary Responsibilities:

• Design, develop, test, and maintain enterprise software applications and services.

• Implement software solutions using modern programming languages (e.g., Java, Python, Go, or similar).

• Build application components, APIs, automation features, and ETL pipelines that collect, clean, and transform data from source to destination.

• Develop and maintain automation frameworks and integrate with identity and access management systems, HR data sources, and directory services such as Active Directory and Okta.

• Develop APIs, microservices, and distributed system components supporting WDP capabilities.

• Integrate software with cloud infrastructure, system environments, and DevSecOps pipelines .

• Support automated build, test, and deployment processes within CI/CD pipelines.

• Ensure software compliance with system administration, cybersecurity, and RMF requirements.

• Collaborate with DevOps, infrastructure, and cybersecurity teams to ensure seamless deployment and operations.

• Maintain and operate the DevSecOps factory, process, documentation, policies, thresholds, and associated automated DevSecOps pipelines.

• Support configuration management, patching, and system integration activities for deployed applications.

• Establish and maintain development, test, integration, staging, and production environments for supporting the System software lifecycle.

• Plan, design, and implement software testing tools, processes, and procedures for conducting all testing for the System.

• Troubleshoot and resolve software defects, integration issues, and performance challenges.

• Optimize application performance, scalability, and reliability in production environments.

• Contribute to technical design, architecture discussions, and engineering best practices.

• Develop and maintain technical documentation, code repositories, and software artifacts.

• Participate in SAFe ceremonies including PI Planning, backlog refinement, sprint reviews, and retrospectives.

Basic Qualifications:

• Active Secret clearance.

• Bachelor's degree in Computer Science, Software Engineering, Engineering, or related technical discipline and at least 8 years of relevant experience OR Master's degree in a related field and at least 6 years of relevant experience.

• At least one of the following foundational qualification pathways consistent with DoD 8140 requirements:

  • Current DoD 8570/8140 baseline certification appropriate for Intermediate System Administrator roles (e.g., Security+, GSEC, SSCP, or equivalent),

  • Offerings listed in the DoD 8140 Training Repository,

  • Demonstrated equivalent training and experience qualifying under DoD 8140 foundational qualification alternatives.

• Minimum of 6 years of experience in software engineering and development.

• Proven experience with Agile software development methodologies, particularly SAFE Agile.

• Experience developing software applications in enterprise environments.

• Experience with programming languages such as Java, Python, Go, or similar.

• Strong knowledge of DevSecOps principles and practices.

• Experience implementing secure DevSecOps pipelines and automated CI/CD workflows.

• Experience developing APIs, microservices, and distributed systems.

• Experience supporting CI/CD pipelines and DevSecOps environments.

• Experience applying system administration concepts, including configuration management and deployment operations.

• Experience supporting secure configuration management, patching, and system hardening practices.

• Experience with configuration management operations and maintaining configuration baselines.

• Experience with software testing, including unit, regression, security, integration, compliance, performance, and acceptance testing.

• Proficiency in developing and maintaining automation frameworks and integrating with identity and access management systems.

• Strong communication and collaboration skills.

Preferred Qualifications:

• Active Top Secret clearance.

• Experience developing containerized applications (Docker, Kubernetes) in cloud environments (AWS, Azure, or GCP).

• Experience developing enterprise software solutions in DoD or Federal environments.

• Experience integrating software with cloud platforms (AWS, Azure, or GCP) and system infrastructure.

• Experience integrating with data platforms, AI/ML services, or analytics systems.

• Advanced cloud certification (e.g., AWS Solutions Architect - Professional, Azure Solutions Architect Expert, or equivalent).

• Familiarity with DoD Security Technical Implementation Guides (STIGs) and container hardening standards.

• Knowledge of Infrastructure-as-Code (IaC) and Configuration-as-Code (CaC) practices.

• Experience with managing software artifact repositories.

AppMod

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.

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.