Senior Microsoft Systems Engineer - TS/SCI Poly

Amentum; McLean (VA); On-site; USD 150,000 - 180,000; Full time

Benefits offered by this job

Health, dental, and vision insurance

Paid time off

401(k) matching

Educational reimbursement

Parental leave

Employee stock purchase plan

Tax-saving options

Disability and life insurance

Pet insurance

Job summary

Amentum is seeking a highly experienced Senior Systems/Infrastructure Engineer to support a McLean, VA customer. The role focuses on designing, deploying, securing, and maintaining Microsoft-based infrastructure (AD, Exchange, SQL Server) in a regulated enterprise environment with a TS/SCI clearance.

The successful candidate will mentor junior staff, coordinate with cybersecurity, networking, and server teams, and ensure compliant, documented, and resilient systems.

Qualifications

• 10+ years of enterprise IT infrastructure experience.
• 7+ years of systems engineering in a Microsoft enterprise environment.
• Experience with large-scale server, workstation, database, messaging, backup, and network environments.
• Must possess and maintain a TS/SCI with Polygraph government security clearance.
• Ability to work independently as a senior technical escalation resource.
• Strong written and verbal communication skills.

Responsibilities

• Designing, implementing, maintaining, and supporting enterprise Microsoft infrastructure.
• Administering and troubleshooting Active Directory, Exchange, SQL Server, backup platforms, and Cisco network infrastructure.
• Creating secure system baseline configurations and maintaining compliance requirements 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

Communication skills

Mentoring

Technical escalation

Team collaboration

Education

BA/BS Degree

Tools

Active Directory

Exchange Server

SQL Server

Cisco Networking

Hyper-V

VMware

WSUS

SCCM

NIST 800-53

STIGs

Job description

Amentum is seeking a highly experienced Senior Systems/Infrastructure Engineer to support a McLean, VA customer. The role focuses on designing, deploying, securing, and maintaining Microsoft-based infrastructure (AD, Exchange, SQL Server) in a regulated enterprise environment with a TS/SCI clearance.

The successful candidate will mentor junior staff, coordinate with cybersecurity, networking, and server teams, and ensure compliant, documented, and resilient systems.