Computer Network Defense Analyst - Night Shift

Leidos LLC; San Antonio (TX); On-site; USD 70,000 - 126,000; Full time

Benefits offered by this job

Health and Wellness programs

Paid Leave

Retirement plan

Job summary

Leidos is seeking a Cyber Network Defense Analyst for the 3rd shift (9 PM–5 AM) to join the CESO effort in San Antonio, TX. This on-site role supports a 24x7 secure cloud migration and provides network defense, monitoring, and incident response services.

Bachelor's degree with 2+ years of related experience; active TS/SCI clearance required. You will detect and respond to threats, monitor SIEMs (Splunk/Elastic), and collaborate with cross-functional teams.

Qualifications

• Bachelor's degree with 2+ years of related experience.
• Active TS/SCI security clearance required.
• DoDD 8140 IAT Level II certification (e.g., Security+ CE).
• Strong computing systems knowledge with Windows, Red Hat, Cloud (AWS/Azure), and networking.
• Experience with implementing security settings per DISA best practices.
• May be asked to obtain a CI Polygraph in the future.

Responsibilities

• Perform computer network incident detection and response activities.
• Monitor security tools and investigate alerts; develop mitigation recommendations.
• Document events in a ticketing system with clear technical writing.
• Maintain regular face-to-face interaction with the customer and handle issues with minimal supervision.
• Influence team performance and improve CESO processes and procedures.
• Ensure system checks are performed timely and documentation is accurate.
• Assist senior analysts and/or managers with forecasting and modeling threats.
• Develop a strong rapport with the customer as a trusted network defense analyst.
• Collaborate with infrastructure, storage, database, and application teams for secure cloud migration.

Skills

Networking

Windows

Red Hat

Cloud (AWS/Azure)

IDS/IPS

Firewalls

SIEM tools

Technical writing

Security best practices

Education

Bachelor's degree

DoDD 8140 IAT Level II

CI Polygraph potential

Tools

SPLUNK

Elastic

Ticketing system

Job 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.

Pay Range

Pay Range: Pay Range $69,550.00 - $125,725.00 The Leidos pay range for this job level is a general guideline only and not a guarantee of compensation or salary. Additional factors considered in extending an offer include (but are not limited to) responsibilities of the job, education, experience, knowledge, skills, and abilities, as well as internal equity, alignment with market data, applicable bargaining agreement (if any), or other law.

Pay and Benefits

Pay and benefits are fundamental to any career decision. That's why we craft compensation packages that reflect the importance of the work we do for our customers.

• Employment benefits include competitive compensation, Health and Wellness programs, Income Protection, Paid Leave and Retirement.

More details are available here.

Leidos Leidos is an industry and technology leader serving government and commercial customers with smarter, more efficient digital and mission innovations. Headquartered in Reston, Virginia, with 47,000 global employees, Leidos reported annual revenues of approximately $17.2 billion for the fiscal year ended January 2, 2026. For more information, visit www.Leidos.com.

Commitment and Diversity

All qualified applicants will receive consideration for employment without regard to sex, race, ethnicity, age, national origin, citizenship, religion, physical or mental disability, medical condition, genetic information, pregnancy, family structure, marital status, ancestry, domestic partner status, sexual orientation, gender identity or expression, veteran or military status, or any other basis prohibited by law.

Leidos will also consider for employment qualified applicants with criminal histories consistent with relevant laws.