Senior Linux & Cloud Systems Engineer III – TS/SCI

SNS One Inc; Fort Meade (MD); On-site; USD 125,000 - 160,000; Full time

Job summary

SNS One, Inc. is seeking a Systems Engineer Level III to support a mission-critical sustainment program in a secure government environment.

The role requires cloud and on-premises infrastructure expertise, systems administration, automation, and security engineering to sustain enterprise systems supporting operational missions. Responsibilities include leading cross-functional teams in Agile, administering Windows and Linux environments, deploying secure AWS, and providing Tier III support for

Qualifications

• Active TS/SCI with Polygraph is required.
• IAT Level II certification required or ability to obtain before start.
• Experience administering Windows Server 2022 and Windows 10/11.
• Experience with Linux (Rocky Linux, CentOS, RHEL).
• Strong AWS exposure: EC2, S3, VPC, IAM, AMIs, Route 53, Workspaces.
• Strong cloud networking knowledge: VPCs, subnets, Transit Gateways, Direct Connect, VPC Peering.
• Experience providing Tier III engineering in enterprise environments.
• Experience with Agile development/operations.

Responsibilities

• Lead cross-functional teams using Agile to support development, integration, and sustainment of complex information systems.
• Administer Windows Server 2022 and Windows 10/11 environments; manage Linux (Rocky Linux, CentOS, RHEL).
• Architect, deploy, and maintain secure AWS cloud environments while supporting on-premises infrastructure.
• Provide Tier III engineering and security engineering support for Splunk SIEM.
• Support enterprise cloud networking architectures and troubleshoot connectivity across hybrid clouds.
• Develop, implement, and maintain system configurations, security baselines, and infrastructure documentation.
• Collaborate with engineering, cybersecurity, and operations to ensure reliability, performance, and compliance.
• Support modernization through infrastructure automation and configuration management.

Skills

TS/SCI clearance

Windows Server 2022

Windows 10/11

Linux (Rocky/CentOS/RHEL)

AWS (EC2/S3/VPC/IAM/AMIs/Route 53/Work

Cloud networking concepts

Agile methodologies

Tier III engineering

Security engineering

Troubleshooting

Education

IAT Level II certification

Tools

Terraform

Ansible

Salt

BigFix

Splunk Enterprise

Job description

SNS One, Inc. is seeking a Systems Engineer Level III to support a mission-critical sustainment program in a secure government environment.

The role requires cloud and on-premises infrastructure expertise, systems administration, automation, and security engineering to sustain enterprise systems supporting operational missions. Responsibilities include leading cross-functional teams in Agile, administering Windows and Linux environments, deploying secure AWS, and providing Tier III support for