Cyber Network Defense Analyst

Description At Leidos , we deliver innovative solutions through the efforts of our diverse and talented people who are dedicated to our customersu2019 success. We empower our teams, contribute to our communities, and operate sustainable. Everything we do is built on a commitment to do the right thing for our customers, our people, and our community. Our Mission, Vision, and Values guide the way we do business. 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. Shift Details The Monitoring and Analysis team operates on a 24x7 schedule across four shifts: + Front Half (Day/Night): Sundayu2013Tuesday + alternating Wednesdays + Back Half (Day/Night): Thursdayu2013Saturday + alternating Wednesdays Candidates must be flexible to work non-core hours as needed. Primary 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 Basic Qualifications Candidates must meet one of the following education and experience combinations: + 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 Relevant experience includes: + Network Administration + Unix/Linux Administration + Software Engineering/Development + Systems Administration + Help Desk/IT Support Additional requirements: + 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 Preferred Qualifications + 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. At Leidos, we donu2019t want someone who

Created: 2025-11-10