Salesforce Developer

Leidos is seeking an experienced Senior System Administrator with team leadership and Microsoft Exchange skills to support the DTRA I3TS Infrastructure Services team to support, maintain and optimize critical mission operations across multiple geographic locations. The ideal candidate will be a technical expert responsible for installation, configuration, security, operation, and maintenance of servers, equipment, and software related to Microsoft Windows server and Exchange.

Candidates must demonstrate a high degree of problem-solving ability in a complex environment and be able to communicate effectively, both to the customer and to team members.

Primary Responsibility:

• Lead and manage a team of seven or more senior System Administrators and engineers with Windows expertise to fulfill DoW customer requirements in a fast-paced, mission-critical environment.
• Provide technical leadership, strategic direction, and mentorship to system administration teams supporting enterprise infrastructure operations, modernization initiatives, and operational excellence.
• Serve as the senior technical escalation point for complex enterprise Windows, Active Directory, and Exchange issues requiring advanced troubleshooting and root cause analysis.
• Architect, design, implement, and maintain highly available, scalable, and secure Windows enterprise environments in compliance with DoD STIGs, RMF requirements, and agency security policies.
• Lead enterprise-level initiatives involving infrastructure modernization, automation, system optimization, and operational process improvements.
• Perform OS installation, configuration, hardening, patching, and lifecycle management activities in compliance with DoD STIGs and agency policies.
• Oversee enterprise automation efforts utilizing scripting and infrastructure as code technologies including Ansible, PowerShell, Bash, and related automation frameworks.
• Develop and enforce enterprise standards, policies, procedures, and best practices for Windows systems administration, Active Directory, and Exchange environments.
• Implement and oversee Windows-based security controls including group permissions, file/folder permissions, group policies, local security policies, auditing, and access management.
• Manage enterprise user accounts, credentials, permissions, access rights, storage allocations, and Active Directory administration across multiple domains and environments.
• Monitor enterprise system performance, capacity, availability, and operational health while proactively identifying and resolving issues to minimize mission impact.
• Coordinate with customers, program leadership, cybersecurity teams, engineers, and stakeholders to collect requirements, conduct analysis, and develop technical solutions supporting operational and strategic objectives.
• Design, implement, and maintain enterprise Active Directory environments including:

• Active Directory Domain Services (AD DS)
• Group Policy architecture and governance
• DNS and DHCP enterprise services
• Directory replication and trust relationships

• Identity and access management integrations
• Lead the architecture, administration, and modernization of Exchange Server and messaging environments including installation, configuration, upgrades, migrations, and high availability solutions.
• Monitor server health, mail flow, database integrity, and messaging infrastructure performance to ensure reliability and operational continuity.
• Manage mailboxes, shared mailboxes, distribution groups, and enterprise messaging permissions while ensuring compliance with security and governance requirements.
• Resolve highly complex email, mail routing, directory synchronization, and client connectivity issues across enterprise environments.
• Lead multiple concurrent projects and initiatives involving infrastructure upgrades, system migrations, security enhancements, and operational transformation efforts.
• Provide technical guidance, mentorship, and knowledge transfer to junior and mid-level administrators while fostering professional development and operational readiness.
• Communicate effectively with executive leadership, internal technical teams, external stakeholders, and customer leadership regarding operational status, risks, recommendations, and project updates.
• Support a mission-driven operational environment including on-call, after-hours, weekend, and emergency response support requirements as needed.
• Create, maintain, review, and approve detailed technical documentation, architecture diagrams, operational procedures, and standard operating procedures (SOPs).
• Drive continuous improvement initiatives focused on automation, operational efficiency, system reliability, cybersecurity posture, and enterprise scalability., CommunicationOperationsAuditingLeadershipManagementAutomationStandard Operating ProcedureMentorshipGovernanceSecurity ControlsCyber SecurityCertified Information Systems Security ProfessionalInformation Technology OperationsOperating SystemsPython (Programming Language)ScalabilityScriptingContinuous Improvement ProcessReliabilityMicrosoft AccessWindows ServersProblem SolvingTroubleshooting (Problem Solving)Enterprise Application SoftwareWindows PowerShellBash (Scripting Language)AnsibleActive DirectoryAnalytical SkillsSystem AdministrationOperational EfficiencyLifecycle ManagementTeam LeadershipKnowledge TransferTechnical DocumentationTechnical LeadershipHardeningNetwork RoutingTop Secret-Sensitive Compartmented Information (TS/SCI Clearance)Infrastructure as Code (IaC)Market DataLaw EnforcementEmergency ResponseEquitiesMicrosoft Certified ProfessionalDynamic Host Configuration Protocol (DHCP)User AccountsIAT Level II CertificationVirtualizationMicrosoft Certified Systems EngineerGroup PolicyWindows System AdministrationCompTIA Advanced Security Practitioner (CASP+)CompTIA Security+ CEMicrosoft Certified: Azure Administrator AssociateLinux ServersClassified NetworksMicrosoft Exchange ServersFile System PermissionsSystem OptimizationLocal Security PolicyFailover ClusteringAncient History

• BS with 8-10 years, or MS degree with 6-8 years of experience in IT operations working with Windows, Linux servers and Virtualization.
• Must hold a Top Secret/SCI Clearance.
• Experience administering Microsoft Exchange Server.
• Strong experience implementing and maintaining Security Technical Implementation Guides (STIGs).
• Document STIG configurations and remediation actions to ensure audit readiness.
• Conduct regular STIG compliance checks using tools like SCAP Compliance Checker and STIG Viewer.
• Proficiency in PowerShell scripting and automation.
• Strong problem-solving, analytical skills, and ability to work independently or in a team.
• Hands-on experience administering Windows network environments.
• DoD 8570 IAT Level II or III certification (e.g., Security+ CE, CASP+, CISSP).
• Experience supporting IC or DoD classified environments., * Microsoft certifications (MCSA, MCSE, Azure Administrator Associate)
• Experience with automation and scripting (Ansible, Bash, PowerShell, Python).
• Expert level knowledge on Active Directory, DNS, DHCP, Group Policy Object (GPO), Microsoft Clustering, domain architecture and performance tuning.
• Working knowledge of virtualization, VMWare, or equivalent.
• Experience supporting classified networks or cross-domain environments

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.

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 .

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 .