Windows Systems Administrator

Position Overview

We are seeking aSenior Infrastructure Engineerto support andoperatemission-critical enclave-based environmentsacrosson-premises VMware infrastructure and AWS cloud.

This role sits at the center of ahigh-security high-availability ecosystem supporting systems wheredowntime has real operational impact. You willbe responsible forowning stabilizing and improvinga complex hybrid environment consisting of bothlegacy and modern platforms.

This is not a passive support rolethis is for someone who can step intake control of the environment anddrive reliability and performance forward.

Clearance Requirement

• Active TS/SCI with Poly security clearance

• Must be eligible to work inrestricted / air-gapped environments

WhatYoullOwn

• Twostandalone/enclave Windows domains:

• On-prem VMware-based infrastructure

• AWS-hosted environment

• A24/7 mission-critical system footprint

• Core enterprise services: identity storage compute backup and security tooling

• Environments withlimited external connectivity and strict security controls

Key Responsibilities

• Administer andmaintainWindows-based infrastructureacross enclave environments

• ManageVMware vCenter /ESXi(host performance VM lifecycle resource optimization)

• SupportAWS cloud infrastructure(EC2 VPC storage IAM fundamentals)

• Maintain and troubleshootActive Directory Group Policy and identity systems

• Overseepatching and system compliancevia WSUS and SCCM

• AdministerMicrosoft ExchangeandCitrix environments

• MaintainDNS networking and core infrastructure services

• Support andoptimizeSAN storage environments

• Managebackup and recovery operationsusing Rubrik

• Support and troubleshootsecurity platforms including:

• TrellixePO

• Rapid7

• Security Onion IDS

• Centrify

• Performdeep-dive troubleshooting and root cause analysisacross systems

• Maintainsystem documentation SOPs and incident response procedures

• Identifyand implementinfrastructure improvements and automation opportunities

Environment Characteristics

• Air-gapped / enclave networks

• Hybridon-prem (VMware) AWS cloud

• Legacy mission systemswith modernization constraints

• Security-first architecture withstrict compliance requirements

• High uptime expectationswith minimal tolerance for disruption

Required Qualifications

• Must have at least 12 years of experience insystems engineering or infrastructure engineering

• Active TS/SCI with Poly

• Strong experience supportingWindows enterprise environments

• Proven experience inhigh-availability / mission-critical systems

• Experienceoperatinginrestricted regulated or air-gapped environments

• Strong troubleshooting skills acrossOS virtualization networking and storage layers

• Ability to work independently andtake ownership of complex systems

Core Technical Expertise

• Operating Systems

• Windows Server (2016/2019/2022)

• Windows 11

• Linux (Rocky Linux Red Hat)

• Virtualization & Cloud

• VMware vCenter /ESXi

• AWS (EC2 VPC storage IAM basics)

• Core Infrastructure

• Active Directory & Group Policy

• DNS / networking fundamentals

• SAN Storage

• Systems Management

• SCCM WSUS

• Microsoft Exchange

• Citrix

• Security Tooling

• TrellixePO

• Rapid7

• Security Onion IDS

• Centrify

• Backup & Recovery

• Rubrik

• Preferred

• PowerShell / Bash scripting

• Experience with compliance frameworks (STIGs RMF NIST)

Operational Expectations

• Support a24/7 operational environment

• Participate in arotational on-call schedule

• Must be able torespond (Return-to-Base) within 2 hours including travel if

• Supportafter-hours maintenance windows and incident response

What Sets This Role Apart

• Direct ownership ofmission-critical systems supporting real-world operations

• Opportunity to work insecure high-impact environments

• Exposure to bothlegacy infrastructure challenges and modernization efforts

• Ability todrive meaningful improvements not justmaintainstatus quo

WhoWereLooking For

An engineer who:

• Hasoperatedincleared environmentsand understands the constraints

• Can walk into acomplex imperfect systemand make it better

• Doesntwait for directionidentifiesproblems and solves them

• Is trusted to handlehigh-pressure situations without supervision

• Brings bothtechnical depth and operational accountability

Bottom Line

Ifyourelooking for a role where:

• Your work directly supportscritical operations

• You havereal ownership and responsibility

• And your impact isimmediate and visible