Operating Systems Test Engineer

Leidos; Orlando (FL); On-site; USD 73,450 - 132,775; Full time

Job summary

Leidos is seeking an experienced Operating Systems Test Engineer for on-site work in Orlando, FL. The role supports the Air Force DoD programs and requires knowledge of OS concepts, V&V, and security testing with ACAS/Nessus.

Responsibilities include maintaining the DI-NIL lab, validating OS configurations, and documenting builds and processes, while collaborating with stakeholders to ensure least-privilege access and compliant deployments.

Qualifications

• Bachelor’s degree in a related field; relevant experience may be considered in lieu of a degree.
• Deep understanding of operating systems concepts and their application to DoD programs.
• Strong written and verbal communication to collaborate with customer representatives and engineers.
• Experience with security testing and remediation using ACAS/Nessus.

Responsibilities

• Maintain the DI-NIL architecture and services (RHEL, Windows, and other systems) and ensure proper structure and compliance configurations.
• Verify and validate all operating systems for production readiness, including patching and version upgrades.
• Document builds and configurations thoroughly and create repeatable process flows.
• Coordinate with customers to configure access using least-privilege principles during stakeholder activities.
• Support DI-NIL by backing up personnel and aiding in verification and validation tasks.

Skills

Operating systems concepts

DoD programs

Communication skills

Security testing (ACAS/Nessus)

Cross-functional collaboration

Test methodology development

Networking basics

Education

Bachelor’s degree in related field

Master’s degree

Tools

Jira

Confluence

Job description

Description

The Decision Advantage - Defense Business Area at Leidos has an opening for an experienced Operating Systems Test Engineer . In this mission we support the Department of the Air Force (DAF) to field and operate the customer's Digital Infrastructure.

The work location for this position is our office in Orlando, FL and does require daily on-site support at this location.

Primary Responsibilities:

• The Test team within the Digital Infrastructure Network Integration Lab (DI-NIL) will be responsible for maintaining the DI-NIL architecture and services. There are levels of support needed throughout to include RHEL, Windows, and other systems and appliances to include structure and compliance configurations, integration with Active Directory for authentication, as well as day-to-day management and review of the architecture.

• All systems destined for operation on the production network will pass through the DI-NIL for V&V testing from the build through configuration to service delivery. This position will work with the team to ensure all operating systems meet the strict compliance required by DoD guidance as well as ensuring all system capabilities are configured for optimum performance for the underlying operating system. This will include patching and version upgrade testing and deployment within the supported environments.

• Full documentation of builds and configurations utilized within the environment are mandatory as well as process flow documentation to ensure all required tasks are documented and repeatable.

• The DI-NIL support effort will also include working with customers to ensure needed operating systems are configured properly and access has been configured to allow a least privilege concept during stakeholder activities within the environment.

• Additional duties will include backing up other personnel in support of the DI-NIL effort which is focused on Verification and Validation for the Digital Infrastructure Network.

Basic Qualifications:

• US citizen with at least a Secret clearance with the ability to obtain and maintain a TS/SCI clearance.

• Bachelor’s degree and 4+ years of prior relevant experience or master’s degree with 2+ years of prior relevant experience. Additional experience may be considered in lieu of a degree.

• Demonstrable knowledge of operating systems concepts and applying these concepts to Department of Defense programs.

• Demonstrable experience in design review participation and providing customer centric input.

• Strong written and verbal communication skills to collaborate with customer representatives, domain experts, and other systems engineers in the development of complex DoD systems.

• Demonstrated ability to participate in cross-functional planning, coordination, and task execution situations involving the full spectrum of system integration activities.

• Ability to work well with people from many different disciplines with varying degrees of technical experience.

• Basic understanding of networking systems and interconnections.

• Understanding of government systems security testing (ACAS/Nessus) and remediation – ability to discuss security issues and concerns.

• Demonstrated ability to brief technical and non-technical customers.

Preferred Qualifications:

• US Citizen with an active TS/SCI clearance and the ability to maintain that clearance during your employment with Leidos.

• Prior experience working on ABMS or JADC2 initiatives

• Mid-level network understanding.

• 4 years of DoD-based system security testing (ACAS/Nessus) and remediation with the ability to discuss security issues and concerns.

• Prior experience designing and deploying networks.

• Prior experience with SAFe Agile implementation.

• Demonstrated experience with Agile program execution and using agile tools (e.g. Jira and Confluence).

• Prior experience support Department of the Air Force programs.

• Previous experience working on complex multi-domain systems.

• Experience with design and validation of Cloud and Edge Computing and Network.

• Demonstrable knowledge of test automation and test result analysis.

• Demonstrable experience in network topologies to validate functionality, performance, stability and scalability of features and products.

• Proven expertise in creating test methodologies and writing test specifications.

• Experience in Integration, test, verification, and validation.

• Ability to achieve a high degree of customer satisfaction and maintain Leidos positive brand recognition.

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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.

Original Posting:

July 28, 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 $73,450.00 - $132,775.00

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.

About Leidos

Leidos is an industry and technology leader serving government and commercial customers with smarter, more efficient digital and mission innovations. Headquartered in Reston, Virginia, with 47,000 global employees, Leidos reported annual revenues of approximately $16.7 billion for the fiscal year ended January 3, 2025. For more information, visit www.Leidos.com .

Pay and Benefits

Pay and benefits are fundamental to any career decision. That's why we craft compensation packages that reflect the importance of the work we do for our customers. Employment benefits include competitive compensation, Health and Wellness programs, Income Protection, Paid Leave and Retirement. More details are available at www.leidos.com/careers/pay-benefits .

Commitment to Non-Discrimination

All qualified applicants will receive consideration for employment without regard to sex, race, ethnicity, age, national origin, citizenship, religion, physical or mental disability, medical condition, genetic information, pregnancy, family structure, marital status, ancestry, domestic partner status, sexual orientation, gender identity or expression, veteran or military status, or any other basis prohibited by law. Leidos will also consider for employment qualified applicants with criminal histories consistent with relevant laws.

REQNUMBER: R-00188298

All qualified applicants will receive consideration for employment without regard to race, color, religion, sex, sexual orientation, gender identity, national origin, disability or veteran status. Leidos will consider qualified applicants with criminal histories for employment in accordance with relevant Laws. Leidos is an equal opportunity employer/disability/vet.