**Description** Leidos is seeking a **Systems Engineer** to support and maintain the development lab environment of a high-profile DOD contract. We are currentlyseeking a skilled and self-driven LinuxSystem Engineerto complement our team and take ownership of a dynamic, multi-platformlab environmentdesigned to support developers and system architects. In this role, you will be responsible for configuring, maintaining, and optimizing critical systems that enable innovation and rapid prototyping. **Primary Responsibilities** + Manage and maintain the VMware vSphere/vCenter virtualization infrastructure, ensuring availability, optimal performance, and security. + Build, manage and support a Linux server environment, including deploying releases, system configuration, troubleshooting, and hardening (STIG compliance and patching) . + Configure, monitor, patch and maintain load balancers, F5 and application layer gateway products to ensure high availability and security compliance. distribution across applications. + Maintain and support the Windows Active Directory (AD) environment, including user account management, group policy configuration, and a small number of Windows domain controllers. + Support Helpdesk as the Tier 3 escalation point to the helpdesk team, providing expert-level troubleshooting and resolution of complex IT issues. + Assist Service Delivery and Developers if needed on designing, staging and deploying NIPR and SIPR based deliverables. + Perform periodic reviews of operational functions, practices and solutions using and provide practical solutions for any identified constraints. + Manage and maintain certificate, keys and other identity elements needed for access to either production or lab resources. + Install and configure cross domain High Speed Guard and other cross domain hardware components. + Configure, manage and develop configuration and application policies for Email and application level Gateways such as SEG, Broadcom API and Policy Manager. + Support the Engineering team in building and testing proof of concept environment which include cross domain hardware and software. **Basic Qualifications** + A minimum of an Associate’s degree in Information Systems or related discipline with at least 10 years of relevant experience, or Bachelor’s degree or higher in Information System or a closely related field a minimum of 8 years of experience. Experience in lieu of a degree may be considered. + Current IAT Level II or higher Certification such as Security + Active DoD Top Secret Clearance w/ ability to obtain and maintain Top Secret. + Experience building, configuring, patching and maintaining Windows/Linux Servers via Ansible or other automation platforms. + Thorough understanding of deploying on-premises systems in virtual and containerized environments. + Knowledge of basic networking and network protocols (e.g. TCP/IP, routing, firewalls, SSH and ports) + Hands-on experience with reviewing system logs and events to resolve issues. + Develop and provide solutions to complex technical issues and problems that impact dev, test and production computing environments. + Experienced with creating and managing critical system work instruction and Standard Operating Procedure documentation. + Experience servicing as a technical escalation resource for Tier 2 or Help Desk support personnel. + Excellent written and oral communication skills. **Preferred Qualifications** + Thorough understanding and/or experience with troubleshooting cross domain Mission Partner (M.P.) data flow interruptions. + Strong working knowledge of configuring and supporting Secure Email Gateway (SEG). + Knowledge with writing or updating application layer Gateways (ALG) to improve or resolve application specific traffic issues. + Familiarization with PDQ and Satellite software deployment tools for Linux and Windows environment. Come break things (in a good way). Then build them smarter. We're the tech company everyone calls when things get weird. We don’t wear capes (they’re a safety hazard), but we do solve high-stakes problems with code, caffeine, and a healthy disregard for “how it’s always been done.” **Original Posting:** July 30, 2025 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 $104,650.00 - $189,175.00 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. REQNUMBER: R-00163486 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.