Computer Network Defense Analyst

Posted 23 Days Ago
Be an Early Applicant
Arlington, VA, USA
In-Office
70K-126K Annually
Junior
Information Technology • Software
The Role
Perform 24x7 computer network defense, incident detection and response, security alert investigation, threat analysis, mitigation recommendations, system monitoring, and ticket documentation. Collaborate with infrastructure, storage, database, and application teams during a secure cloud migration. The role also supports customer interactions, process improvements, system checks, and threat forecasting in a mission-critical DoD environment.
Summary Generated by Built In

We are currently seeking a Cyber Network Defense Analyst 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 Arlington, VA 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:September 22, 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.

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.

Skills Required

  • Bachelor's degree and 2+ years of related experience; additional experience, education, or training may substitute for the degree
  • Active TS/SCI security clearance
  • DoDD 8140 IAT Level II or Level III certification, such as Security+ CE
  • Strong knowledge of Windows, Red Hat, AWS, Azure, networking, communication protocols, IDS/IPS systems, and firewalls
  • Experience implementing application and hardware security settings using vendor and DISA best practices
  • Prior computer network defense experience in a large enterprise or DoD/IC environment
  • Experience monitoring intrusion detection and computer network defense appliances and applications
  • Experience analyzing security alerts and documenting response recommendations in a ticketing or case-management system
  • Experience reviewing system logs manually and using SIEM tools such as Splunk or Elastic
  • Prior experience with DISA and support to mission partners
  • Understanding of disaster recovery and business continuity concepts for secure cloud migrations
  • Ability to obtain a CI polygraph in the future

Leidos Compensation & Benefits Highlights

The following summarizes recurring compensation and benefits themes identified from responses generated by popular LLMs to common candidate questions about Leidos and has not been reviewed or approved by Leidos.

  • Healthcare Strength — Healthcare coverage is described as comprehensive, with multiple plan options, low office-visit copays in some plans, and access to mental health and wellness support tools. The availability of HSA/FSA options and employer contributions is positioned as a meaningful part of the total package.
  • Retirement Support — Retirement benefits are framed as a strong component of total rewards, highlighted by a 401(k) match and immediate vesting in the standard package. The Employee Stock Purchase Plan is also presented as an additional long-term wealth-building feature.
  • Wellbeing & Lifestyle Benefits — Wellbeing and lifestyle supports extend beyond core insurance, including wellness programs, fitness-related stipends, and assistance resources. Work flexibility and related perks are also included as part of the broader rewards experience.

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The Company
HQ: Reston, VA
27,104 Employees
Year Founded: 1969

What We Do

We Are Leidos For 50 years we have been tackling some of the biggest problems that face our nation and our world. OUR MISSION Through our culture of innovation and history of performance, we develop deep customer trust built on integrity and create enduring solutions that improve our world. Leidos is a science and technology solutions leader working to address some of the world’s toughest challenges in the defense, intelligence, homeland security, civil, and healthcare markets. The company’s 43,000 employees support vital missions for government and commercial customers. Headquartered in Reston, Va., Leidos reported annual revenues of approximately $11.09 billion for the fiscal year ended January 3, 2020. Leidos was cited for the meaningful work employees perform that is challenging, impactful, and aligned with our customers’ missions as reasons professionals want to work and stay at our company. Leidos has also been named to lists including Forbes’ Best Employers for Diversity, Forbes’ America’s Best Employers for Women, Military Times Best for Vets Employers, and Ethisphere Institute’s World's Most Ethical Companies®. Employees enjoy career enrichment opportunities available through mobility and development and experience rewarding relationships with supportive supervisors and talented colleagues and customers. Employees appreciate our flexible work environment, allowing for and encouraging a true work-life balance. Our professionals are also excited about our Employee Resource Groups, like the newly launched Collaborative Outreach with Remote and Embedded Employees (CORE), which strives to create an environment where every employee, regardless of location, feels fully engaged as a valued employee of Leidos. Your most important work is ahead.

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