To our valued Leidos candidates:

Coronavirus is on everyone's mind with the effects being felt around the world. The markets are volatile, and we're all concerned for the health and safety of our families, friends, and colleagues. Please know that we're taking all necessary measures to safeguard our employees, customers and the communities in which we live, including following all recommended best practices around social distancing.

With that in mind, in an abundance of caution, we are canceling all face to face career events, such as job fairs and open house events. In the coming days and weeks, we will be hosting career events virtually, using our online chat tools so that we may continue our hiring practice safely and securely. You can find available virtual career events at

We are using telephone meetings and online chats via Brazen to conduct interviews and hiring discussions, and we are offering options for video interviews so that you can have a virtual face to face meeting with your potential new leader. We do not conduct interviews or extend offers via text or chat based social media, such as WhatsApp or MySpace.

Leidos will never ask you to provide payment-related information at any part of the employment application process, nor will Leidos ever advance money as part of the hiring process. And Leidos will communicate with you only through emails that are generated by automated system. If you receive an email purporting to be from Leidos that asks for payment-related information or any other personal information, please report the email to Chris Scalia, Leidos’ Senior Vice President of Talent Acquisition, at [email protected].

As a company, as a country, as a world, we have confronted challenging moments before. We are confident that, guided by our values and the strength of our community as well as the commitment we have to the important work we do each day, we will find our way through this time together. We will do this with the care and concern for one another and the common good that defines. Please keep those impacted by the virus in your thoughts.

Close Window
Join our talent network
Skip to main content

Job #: R-00079329
Location: Washington, DC
Category: Security Architecture and Engineering
Schedule (FT/PT): Full Time
Travel Required: No
Shift: Day
Clearance: Top Secret/SCI
Referral Eligibility: Eligible
Referral Bonus Amount: $5000
Group: Intelligence

This job posting is no longer active.

Share: mail twitter linkedin


Job Description:

Leidos is seeking a talented Senior Security Engineer to join our team to support a federal customer within the Department of Homeland Security (DHS) Enterprise Security Operations Center (ESOC). The Senior Security Engineer provides support across the security boundaries focusing on supporting the ESOC Operations mission. The Senior Security Engineer will support the information security team to offer support to security tools and technologies by engaging in the full security engineering life cycle, including requirements analysis, design, development, integration, testing, documentation, and implementation following defined security best practices and standards. This role will engage in infrastructure solution design and architecture, information assurance, advisory, compliance, and risk management support.

Primary Responsibilities:

  • Collaborate with the information security and assessors team to support security tools and technologies such as network threat analysis tools, Endpoint detection and response, vulnerability management, threat intelligence and other security tools.

  • Support the modernization of Security Architectures to Zero Trust and TIC 3.0 by using modern cloud security tools.  

  • Implementing and troubleshooting of Network Security tools such as Tanium, McAfee, ForeScout, FireEye, SourceFire and Suricata.

  • Operationalize, administer and maintain the Tanium Platform.

  • Manage multiple assignments, changing priorities, and work independently with little oversight.

  • Work closely with senior engineers, other team members and application owners to solve technical problems at the network, system, and application levels.

  • Conduct periodic architectural reviews of installed sensors to assess effectiveness and propose optimal installation alternatives as required

  • Hardware and software installations, integration, upgrades, and maintenance of tools distributed throughout the datacenters.  

  • Provide follow-up reports for technical findings, feedback, and resolution steps taken for Root Cause Analysis, engineering technical assessment and process improvement initiatives.

  • Communicate with project manager on a frequent basis. Identifies tasks and issues that may have an impact on service levels or schedules.

Basic Qualifications:

  • Must have a current TS/SCI clearance

  • Bachelor's degree in related field including Computer Science, Cyber Security and Information Security

  • A minimum of 7 years of experience as Security engineer with concentration in Cybersecurity.

  • A minimum of 7 years of hands-on experience performing the following responsibilities:

    • Implementing security measures that effectively safeguard sensitive data in the event of cyber-attack. 

    • Developing and supporting network security solutions and providing guidance on vulnerabilities or potential vulnerabilities within the enterprise architecture. 

    • Hands-on experience with Tanium, Gigamon, Suricata, SourceFire, FireEye, ePO, and other network and endpoint security tools.

    • Experience with the following security technologies:  IPS/IDS, Firewalls, Proxies and reverse proxies, DNS servers, Anti-virus/Anti-malware tools, Endpoint detection and response tools, vulnerability and asset management tools.  

  • 5 years of experience in Systems Administration/Engineering.

  • Highly skilled in Linux-related scripting (Bash, Perl, Python, etc.)

  • React to and initiate corrective action regarding security violations, attempts to gain unauthorized access, malware and virus infections that may affect the network or other event affecting security.

  • Identify security risks, threat vectors, vulnerabilities of networks, systems, applications, and new technology initiatives.

  • Experience with application content updates like AV signatures, NIPS signatures, threat intelligence.

  • Work with developers, IT management, and other business stakeholders to gain an understanding of business security requirements for critical systems and sensitive data.

  • Communicate security vulnerability reports and trends to ensure appropriate corrective action is taken.

  • Develop, implement, communicate, and enforce security policies and/or processes for data, software applications, and cloud infrastructure.

  • Strong technical, analytical, and interpersonal skills. Self-motivation and ability to work independently.

  • Superior attention to detail with excellent written and verbal communication, problem solving, researching and follow-up skills

  • Department of Homeland Security NOSC employees are required to obtain an Entry on Duty (EOD) clearance to support this program

  • Candidate must, at a minimum, meet one of these certifications: CISSP, CCSP, CCNP, CCIE Security, CEH, MCSE, COMPTIA Security+, GCIH, GPEN, OSCP, OSCE

Preferred Qualifications:

  • Knowledge of SIEM tools such as Splunk

  • Experience working in AWS and Azure

  • Experience developing in Bash, Python, YAML

  • Experience working with SIEM tools such as Splunk

  • Knowledge of CASB or Zscaler is a plus

Pay Range:

About Leidos

Leidos is a Fortune 500® technology, engineering, and science solutions and services leader working to solve the world’s toughest challenges in the defense, intelligence, civil, and health markets. The company’s 47,000 employees support vital missions for government and commercial customers. Headquartered in Reston, Virginia, Leidos reported annual revenues of approximately $14.4 billion for the fiscal year ended December 30, 2022.   For more information, visit

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.

Securing Your Data

Beware of fake employment opportunities using Leidos’ name. Leidos will never ask you to provide payment-related information during any part of the employment application process (i.e., ask you for money), nor will Leidos ever advance money as part of the hiring process (i.e., send you a check or money order before doing any work). Further, Leidos will only communicate with you through emails that are generated by the automated system – never from free commercial services (e.g., Gmail, Yahoo, Hotmail) or via WhatsApp, Telegram, etc. If you received an email purporting to be from Leidos that asks for payment-related information or any other personal information (e.g., about you or your previous employer), and you are concerned about its legitimacy, please make us aware immediately by emailing us at [email protected].

If you believe you are the victim of a scam, contact your local law enforcement and report the incident to the U.S. Federal Trade Commission.

Commitment to 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.

This job posting is no longer active.

Related Opportunities

Talent Community

Join our Talent Community to create a profile, enabling a streamlined application process and to help our recruiters better understand your areas of expertise and interest.

Join our Talent Community