Senior Cybersecurity Engineer: Splunk & SIEM Lead (TS/SCI)

MANTECH; Chantilly (VA); On-site; USD 120,000 - 170,000; Full time

Job summary

MANTECH in Chantilly, VA seeks a Principal Cyber Security Engineer to design, deploy, and maintain secure data collection and monitoring solutions that enable informed decision-making across the enterprise. You will support mission-critical cybersecurity operations and ensure data integrity and rapid incident response.

The role requires strong SIEM expertise (Splunk), Linux administration, and DoD security guidance knowledge.

Qualifications

• Bachelor’s degree or equivalent cybersecurity experience.
• 7+ years of cybersecurity experience.
• Experience with SIEM platforms and Splunk enterprise environments.
• Knowledge of Linux systems administration, OS security, TCP/IP networking.
• Knowledge of Certification and Accreditation (C&A) processes and DoD security guidance.
• DoD 8570.1 IAT Level II+ certification, or ability to obtain within 30 days of hire.

Responsibilities

• Troubleshoot data collection issues to ensure reliable ingestion of security data.
• Diagnose and resolve system issues affecting stability, performance, or usability.
• Deploy, manage, and maintain Splunk Add-ons for data sources.
• Develop and maintain documentation, including BOE artifacts, engineering docs, change records, system security plans, and accreditation materials.
• Deliver Splunk deployment documentation detailing specifications, deployment methods, and architectural considerations for production environments.
• Implement and maintain strict RBAC to ensure data access on a need-to-know basis.
• Design and deploy Splunk forwarders using the Splunk Deployment Server for rapid, consistent deployments.

Skills

SIEM experience

Splunk expertise

Linux administration

Networking (TCP/IP)

DoD 8570.1 IAT II+

Education

Bachelor’s degree or equivalent cybersecurity experience

Tools

Splunk Enterprise

Splunk Deployment Server

AWS

Job description

MANTECH in Chantilly, VA seeks a Principal Cyber Security Engineer to design, deploy, and maintain secure data collection and monitoring solutions that enable informed decision-making across the enterprise. You will support mission-critical cybersecurity operations and ensure data integrity and rapid incident response.

The role requires strong SIEM expertise (Splunk), Linux administration, and DoD security guidance knowledge.