Cyber Network Defense Analyst

Leidos Holdings • Bay Saint Louis, MS

69d • $67,600 - $122,200

About The Position

Leidos is seeking a Junior Cyber Network Defense Analyst to join our team supporting a high-visibility cybersecurity IDIQ contract. This program provides 24x7x365 Security Operations Center (SOC) support, cyber analysis, application development, and incident response for the Department of Homeland Security (DHS). The DHS SOC is responsible for monitoring, detecting, analyzing, mitigating, and responding to cyber threats across the DHS Enterprise. Analysts coordinate detection and response activities across component SOCs using a shared incident tracking system and other communication tools.

Requirements

• BS in IT, Cybersecurity, Data Science, Info Systems, or Computer Science + 2 years of experience
• AS degree + 6 years of experience
• High School Diploma/GED + 8 years of experience
• TS/SCI clearance
• Entry on Duty (EOD) clearance
• At least one of the following certifications: CompTIA: Security+, PenTest+, Cloud+, CySA+, SANS GIAC: GFACT, GCED, GSEC, GCIA, GDSA, GICSP, GCFA, GISF, EC Council: CEH, CISCO: CBROPS, CertNexus: CFR, Federal IT Security Institute: FITSP-O

Nice To Haves

• Familiarity with SOC methodologies and processes
• Understanding of network ports/protocols (TCP/UDP, HTTP, ICMP, DNS, SMTP)
• Knowledge of network topologies and security devices (Firewall, IDS/IPS, Proxy, DNS)
• Experience with packet analysis tools (e.g., Wireshark)
• Familiarity with malware, attack vectors, and Windows OS logging
• Experience with Antivirus, DLP, and host-based firewalls
• Scripting skills in Python, PowerShell, JavaScript, VBS, etc.

Responsibilities

• Monitor enterprise networks using SIEM tools
• Investigate alerts and document findings in Security Event Notifications (SENs)
• Analyze network traffic (PCAP, firewall, proxy, IDS logs, etc.)
• Collaborate with team members to assess threats
• Stay current on emerging threats and vulnerabilities
• Monitor shared inboxes for notifications and requests
• Use OSINT to support investigations
• Contribute to content tuning and detection improvements

What This Job Offers

• Job Type: Full-time
• Career Level: Entry Level
• Industry: Professional, Scientific, and Technical Services
• Education Level: Bachelor's degree
• Number of Employees: 11-50 employees