LINUX SYSTEMS ENGINEER III ~ Fort Meade, MD ~ Full Scope Polygraph

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

Here's a ClearedJobs-ready posting based on the information provided and aligned with SNS One's typical format:

Job Title: Systems Engineer Level III (BP-292)

Location: NCR (National Capital Region)

Clearance Required: TS/SCI with Full Scope Polygraph

Certification Required: IAT Level II

Job Type: Full-Time

About the Opportunity

SNS One, Inc. is seeking an experienced Systems Engineer Level III to support a mission-critical sustainment program within a highly secure government environment. This position requires a strong background in cloud and on-premises infrastructure, systems administration, automation, and security engineering. The selected candidate will play a key role in maintaining and enhancing enterprise systems supporting critical operational missions.

Key Responsibilities

• Lead cross-functional teams utilizing Agile methodologies to support the development, integration, and sustainment of complex information systems.

• Administer, troubleshoot, and maintain Windows Server 2022 environments, Windows 10/11 client systems, and Linux operating systems including Rocky Linux, CentOS, and Red Hat Enterprise Linux (RHEL).

• Architect, deploy, and maintain secure AWS cloud environments while supporting existing on-premises infrastructure.

• Provide Tier III systems engineering and security engineering support for Splunk Security Information and Event Management (SIEM) platforms.

• Support enterprise cloud networking architectures and troubleshoot connectivity across hybrid cloud environments.

• Develop, implement, and maintain system configurations, security baselines, and infrastructure documentation.

• Collaborate with engineering, cybersecurity, and operations teams to ensure system reliability, performance, and compliance.

• Support modernization initiatives through infrastructure automation and configuration management solutions.

Required Qualifications

• Active TS/SCI with Polygraph clearance.

• IAT Level II certification or ability to obtain prior to start.

• Experience administering Windows Server 2022 and Windows 10/11 environments.

• Experience supporting Linux systems including Rocky Linux, CentOS, and RHEL.

• Strong experience with AWS cloud services, including:

  • EC2

  • S3

  • VPC

  • IAM

  • AMIs

  • Route 53

  • AWS Workspaces

  • Additional core AWS services

• Strong understanding of cloud networking concepts, including:

  • Virtual Private Clouds (VPCs)

  • Subnets

  • Transit Gateways

  • Transit Gateway Attachments

  • Transit Gateway Route Tables

  • Direct Connect

  • VPC Peering

• Experience providing Tier III engineering support in enterprise environments.

• Strong troubleshooting, analytical, and problem-solving skills.

• Experience working within Agile development and operations environments.

Desired Qualifications

• Experience with infrastructure automation and configuration management tools including:

  • Terraform

  • Ansible

  • Salt

  • BigFix

• Experience supporting Splunk Enterprise and Splunk SIEM environments.

• Experience supporting hybrid cloud and on-premises architectures.

• Knowledge of cybersecurity best practices, compliance requirements, and system hardening.

Why SNS One?

SNS One, Inc. is a Service-Disabled Veteran-Owned Small Business (SDVOSB) delivering innovative IT, cybersecurity, cloud, and systems engineering solutions to federal customers. We offer challenging mission-focused work, competitive compensation, and opportunities to work alongside highly skilled professionals supporting national security missions.