Cyber Defense Analyst — DoD 24/7 SOC (TS/SCI)

Leidos; Fort Belvoir (VA); On-site; USD 87,000 - 157,000; Full time

Job summary

Leidos is seeking a Cyber Security Analyst to support the DoDIN defense from the Fort Belvoir SOC, performing continuous monitoring, incident response, and vulnerability management across on‑prem and cloud environments.

You will investigate threats, coordinate investigations, and prepare actionable reports while collaborating with DoD cyber professionals. U.S. citizenship with an active TS/SCI clearance and baseline Security+ CE/CSSP-Infra are required.

Qualifications

• Bachelor's degree and 4–8 years of relevant cybersecurity experience.
• Hands-on experience using an enterprise SIEM platform.
• Experience analyzing high volumes of security logs and network data, including NetFlow and/or full packet capture.
• Experience with network traffic and packet analysis.
• Strong understanding of TCP/IP, common ports and protocols, network traffic flows, the OSI model, system administration, defense-in-depth, and network security technologies.
• Understanding of cloud security concepts and considerations.
• Familiarity with Unix-based systems.
• Ability to work effectively in a collaborative, mission-focused SOC environment.
• Baseline certification (Security+ CE) and CSSP-Infrastructure Support certification at start.
• U.S. citizenship with an active TS/SCI clearance with SAP Eligibility.

Responsibilities

• Lead and coordinate investigations throughout the Incident Response lifecycle, from initial detection through remediation.
• Correlate and analyze security events, alerts, logs, and network data to determine the scope and impact of cyber incidents.
• Acquire and analyze endpoint and network artifacts, including NetFlow and full packet capture, to identify malicious or suspicious activity.
• Identify attacker tactics, techniques, and procedures (TTPs) and indicators of compromise (IOCs) to strengthen detection and response capabilities.
• Tune and maintain SIEM and IDS technologies to reduce false positives and improve SOC detection effectiveness.
• Develop and maintain Incident Response processes, procedures, workflows, and playbooks.
• Document investigations and response actions in case management systems and prepare clear, actionable incident reports.
• Collaborate with cyber professionals in a fast-paced operational environment to defend the DoD Information Network (DoDIN) against sophisticated threats and advanced persistent threat (APT) actors.

Skills

SIEM

Incident response

Threat analysis

Network forensics

Education

Bachelor's degree

Tools

NetFlow

Packet capture

Job description

Leidos is seeking a Cyber Security Analyst to support the DoDIN defense from the Fort Belvoir SOC, performing continuous monitoring, incident response, and vulnerability management across on‑prem and cloud environments.

You will investigate threats, coordinate investigations, and prepare actionable reports while collaborating with DoD cyber professionals. U.S. citizenship with an active TS/SCI clearance and baseline Security+ CE/CSSP-Infra are required.