Senior Microsoft Infrastructure Engineer TS/SCI Cleared

Amentum; McLean (VA); On-site; USD 140,000 - 160,000; Full time

Benefits offered by this job

Health insurance

401(k) matching

Paid time off

Educational reimbursement

Parental leave

Employee stock purchase plan

Job summary

Amentum seeks a highly experienced Senior Systems/Infrastructure Engineer to support a McLean, VA client in a mission-critical government contractor environment. The role emphasizes Microsoft-based infrastructure design, deployment, and operations, including AD, Exchange, SQL Server, backups, and Cisco networking.

Candidates should have TS/SCI with Polygraph clearance, 10+ years in enterprise IT, and strong documentation and cross-team collaboration skills.

Qualifications

• 10+ years of enterprise IT infrastructure experience.
• 7+ years of systems engineering experience in a Microsoft enterprise environment.
• Advanced experience supporting large-scale server, workstation, database, messaging, backup, and network environments.
• Strong understanding of cybersecurity, system hardening, compliance, audit readiness, and vulnerability management.
• Ability to work independently as a senior technical escalation resource.
• Strong written and verbal communication skills.
• Must possess and maintain a TS/SCI with Polygraph government security clearance. U.S. citizenship required.

Responsibilities

• Designing, implementing, maintaining, and supporting enterprise Microsoft infrastructure.
• Administrating and troubleshooting Active Directory, Exchange, SQL Server, backup platforms, and Cisco network infrastructure.
• Creating secure system baseline configurations and maintaining compliance through technical assessments, auditing, and continuous monitoring.
• Documentation generation of processes and system artifacts for internal and customer review.
• Managing enterprise patching and system maintenance activities and supporting vulnerability remediation (POA&Ms) and risk reduction efforts.
• Supporting disaster recovery and business continuity planning through backups and restores.
• Mentoring junior administrators and engineers and serving as senior technical escalation resource for complex infrastructure problems.
• Coordinating with cybersecurity, networking, database, server, and management teams.
• Ensuring infrastructure remains secure, available, properly documented, and compliant.

Skills

Microsoft Infrastructure

Active Directory

Microsoft Exchange

Microsoft SQL Server

Enterprise Backup

Cisco Networking

Virtualization

Security Hardening

Patch Management

Documentation

Tools

WSUS

SCCM

Rapid7

Nessus

Hyper-V

VMware

Job description

Amentum seeks a highly experienced Senior Systems/Infrastructure Engineer to support a McLean, VA client in a mission-critical government contractor environment. The role emphasizes Microsoft-based infrastructure design, deployment, and operations, including AD, Exchange, SQL Server, backups, and Cisco networking.

Candidates should have TS/SCI with Polygraph clearance, 10+ years in enterprise IT, and strong documentation and cross-team collaboration skills.