Computer Network Defense Analyst - Night Shift

Description

We are currently seeking a Cyber Network Defense Analyst 3rd Shift (9PM-5AM) to join the Compartmented Enterprise Services Office (CESO) effort. This program is establishing a modern secure web service (SWS) operation as part of a state-of-the-art, highly automated platform capable of supporting a rapidly expanding customer population. Our team supports CESO's mission to protect networked systems and services from cyber threats as CESO migrates to a high security cloud environment, operating as a 24x7, mission-critical function providing network defense, monitoring, and incident response services. We are looking for a self-starter capable of independently performing daily tasks while also working well within a team that requires significant coordination and communication.

This position is based in San Antonio, TX and is 100% on-site.
Requires a TS/SCI US Government Security Clearance to start.

Primary Responsibilities

• Perform computer network incident detection and response activities to detect, correlate, identify, and characterize anomalous activity indicative of threats to the CESO enterprise.
• Monitor security tools and applications for possible malicious activity, investigate associated alerts or indicators, and develop recommendations for a course of action, including mitigation strategies as required.
• Document each event and its associated analysis in a ticketing system with clear, accurate technical writing so it can be reviewed and acted on appropriately.
• Maintain regular face-to-face interaction with the customer; handle issues when they are raised by the customer with little or no supervision.
• Positively influence team performance by improving CESO processes and procedures.
• Ensure system checks are performed in a timely manner and that documentation is complete and accurate.
• Assist senior analysts and/or managers with forecasting and modeling current threats.
• Develop a strong rapport with the customer and serve as a trustworthy network defense analyst.
• Collaborate with infrastructure, storage, database, and application teams to align network defense monitoring with CESO's operational requirements as the program transitions to its secure cloud environment.

Basic Qualifications

• Bachelor's degree and 2+ years of related experience; additional experience, education, or training may be considered in lieu of degree.
• Active TS/SCI security clearance required for this position.
• DoDD 8140 IAT Level II (or Level III) certification (e.g., Security+ CE).
• Strong computing systems knowledge with Windows, Red Hat, Cloud (AWS, Azure), and particularly networking, including communication protocols and familiarity with common security elements such as IDS/IPS systems and firewalls.
• Experience with implementing application/hardware security settings using vendor and DISA best business practices.
• Candidate may be asked to obtain a CI Polygraph in the future.

Preferred Qualifications

• Prior CND experience, ideally within a large enterprise or DoD/IC program environment.
• Experience monitoring intrusion detection and computer network defense appliances, applications, and analyzing associated alerts.
• Experience documenting analysis and providing response recommendations in a ticketing/case management system.
• Experience reviewing system logs manually and using automatic SIEMs tools (e.g., SPLUNK, Elastic) and performing network log analysis.
• Prior experience with DISA and DISA's support to mission partners.
• An Understanding of disaster recovery and business continuity concepts as they apply to secure cloud migrations.

#ceso

If you're looking for comfort, keep scrolling. At Leidos, we outthink, outbuild, and outpace the status quo - because the mission demands it. We're not hiring followers. We're recruiting the ones who disrupt, provoke, and refuse to fail. Step 10 is ancient history. We're already at step 30 - and moving faster than anyone else dares.

Original Posting:

October 2, 2026

For U.S. Positions: While subject to change based on business needs, Leidos reasonably anticipates that this job requisition will remain open for at least 3 days with an anticipated close date of no earlier than 3 days after the original posting date as listed above.