System Administrator - Linux/Windows & Security (Mid or Senior)

System Administrator–Linux/Windows & SecurityJoin WOOD Federal Solutions as a System Administrator–Linux/Windows & Security supporting a large, distributed, mission-critical network environment. This role is designed for an experienced systems professional who is equally comfortable administering Linux and Windows platforms, strengthening system security, and troubleshooting complex infrastructure in high-assurance environments.You will support geographically distributed and air-gapped systems, maintain server and workstation environments, deploy software and hardware, manage patching and system hardening, and help ensure reliable operations across complex technical domains. The work includes Windows Server and Active Directory administration, Linux support, vulnerability remediation, security configuration, backup and recovery, and sustaining systems that must remain secure, stable, and operational.This position is well suited for someone who enjoys working at the intersection of systems administration, infrastructure security, and operational problem-solving. You will collaborate with technical teams and users, support system upgrades and accreditation activities, and contribute to maintaining resilient environments that support demanding mission requirements. The role also includes periodic local, CONUS, and OCONUS travel.Security Clearance Requirements: This position requires candidates to be U.S. Citizens and possess a TS/SCI Security Clearance with an appropriate Polygraph.ResponsibilitiesThe selected candidate will be responsible for installing applications, administering systems and processes, and ensuring issues are identified and resolved in a timely manner. This role also includes optimizing server and desktop configurations to support reliable, continuous, and efficient operations, as well as performing security management and application performance optimization activities.Additional responsibilities may include:Administration/sustainment of a system that provides a web?based application for storing, sharing, and distributing information.Creating and maintaining complex server enclaves, including analyzing system scanning reports, patching, cert renewals, vulnerability management assessments, and active directory configurations.Identifying and correcting hardware and software issues.Responding to system administration, operations, and maintenance problems, and developing re?work solutions.Creating and maintaining documentation of complex server/network environments to ensure that clear, concise and accurate information is readily available for incident resolution.Communicating with users and external support personnel regarding system outages and upgrades and conferring with upper management regarding recommended resolution options.QualificationsBasic QualificationsMust have substantial experience working as a systems administrator providing direct support to large groups of end users and technical staff (developers, testers, engineers, etc.).Must have at least 5 years of hands?on experience supporting Linux and Microsoft?based servers and workstations.Must have at least 5 years of hands?on experience with operating system and application hardening, including DISA, best practices, and high?assurance environments.Must have at least 5 years of hands?on experience with software and hardware deployment, patch management, operating systems, and system backup and restore functions.Must be proficient with Windows Server 2016, 2019, and Active Directory.Ability to travel is required, including local area travel and occasional 1?2 week CONUS and OCONUS trips on an annual basis.Preferred QualificationsBachelor's Degree in System Engineering, Computer Science, Information Systems, Engineering Science, Engineering Management, or a related technical field and at least 8 years of relevant experience.Experience building, configuring, and maintaining large, distributed Trellix ePO environments from the ground upStrong scripting experience with SALT and PythonHands?on experience with Red Hat 7/8, VMware, Apache Tomcat, IIS, SQL Server, and KVMsExperience supporting security accreditation and certification, advanced security protocols, and network security technologies, including PKI, SSP, multi?domain environments, and vulnerability assessmentExperience with client and server virtualization, hardware installation and troubleshooting, system optimization, and related tools such as disk arrays, PowerShell, PowerCLI, HSMs, and NTPSolid understanding of information security principles, software security, and security architectureAbout WOODWOOD Federal Solutions is a mission-focused federal contractor supporting complex national security and government programs. We bring experienced professionals, disciplined execution, and a commitment to engineering trust for mission success. Our teams work in demanding technical environments where expertise, reliability, collaboration, and accountability matter.At WOOD, employees have the opportunity to contribute to meaningful customer missions while continuing to grow professionally within a company that values strong performance, continuous learning, and respect for the people doing the work.Fringe BenefitsHealth Insurance: Comprehensive medical, dental, and vision coverage.Retirement Plan: 401(k) plan with company match.Paid Time Off: Paid vacation, sick leave, and company holidays.Professional Development: Opportunities for training, certifications, and continued professional growth.Work-Life Support: Workplace flexibility where permitted by position, customer, security, and mission requirements.Wellness Resources: Employee assistance and wellness programs, including available fitness-related benefits and discounts.Why Join WOOD?Meaningful Mission: Contribute your expertise to programs supporting important federal and national security missions.Professional Growth: Build your capabilities through challenging assignments, training, certifications, and opportunities for continued development.Collaborative Environment: Work alongside experienced professionals in teams that value technical excellence, accountability, and effective collaboration.Competitive Compensation: Receive competitive compensation and a comprehensive employee benefits package.Opportunity to Make an Impact: Join an organization where strong performers can contribute ideas, improve how work gets done, and have a visible impact on customer and company success. Wood Consulting