Onsite Cyber Defense Analyst – TS/SCI Clearance

Leidos; Suitland (MD); On-site; USD 87,000 - 157,000; Full time

Job summary

Leidos is recruiting a Cyber Defense Analyst to join a mission-focused team supporting Navy cybersecurity at ONI HGCC in Suitland, MD. The role involves frontline monitoring of TS/SCI networks, alert analysis, and proactive threat hunting within a 24/7 operation.

Training occurs on the day shift before transitioning to a weekday schedule. The analyst will use SIEMs (Splunk/Elastic), NIDS like FirePower and NGFWs, and host tools (Defender, ePO, Tanium) while coordinating with stakeholders and

Qualifications

• Bachelor’s or higher in Cybersecurity, IT, or related field; 4+ years of experience or Master’s with 2+ years.
• Active TS/SCI clearance in DISS with required program access.
• Experience monitoring and investigating security alerts from cybersecurity tools.
• Knowledge of SIEMs (Splunk, Elastic) and NIDS/NIPS (FirePower, NGFW).
• Scripting knowledge (Python, Perl, Ruby, JavaScript, PowerShell, C/C++, Java).
• Understanding of offensive security tools (Kali, Nmap, Burp Suite, sqlmap, Metasploit).
• Familiarity with ticketing systems, reporting, and intelligence dissemination.

Responsibilities

• Monitor security tools to detect alerts on TS/SCI networks and JWICS-type environments.
• Investigate alerts, perform initial analysis, and escalate to Tier 2 when needed.
• Create and manage incident/event tickets in the ticketing system.
• Conduct proactive threat hunting for emerging threats and anomalies.
• Perform wireless security scans and report findings.
• Correlate alerts across platforms to identify trends and threats.
• Prepare operational and situational awareness briefings for stakeholders.
• Support annual cyber defense exercises and drills.

Skills

Security monitoring

SIEM experience

Threat hunting

Incident management

Scripting languages

Networking knowledge

Reporting & analytics

Education

Bachelor's degree in Cybersecurity/IT/Info Assurance

Master’s degree (optional)

Tools

Splunk

Elastic

Cisco FirePower

Palo Alto NGFW

Trellix ePO

Microsoft Defender

Tanium

Kali

Nmap

Burp Suite

sqlmap

Metasploit

Job description

Leidos is recruiting a Cyber Defense Analyst to join a mission-focused team supporting Navy cybersecurity at ONI HGCC in Suitland, MD. The role involves frontline monitoring of TS/SCI networks, alert analysis, and proactive threat hunting within a 24/7 operation.

Training occurs on the day shift before transitioning to a weekday schedule. The analyst will use SIEMs (Splunk/Elastic), NIDS like FirePower and NGFWs, and host tools (Defender, ePO, Tanium) while coordinating with stakeholders and