About the role

What will you do at Leidos?

As a Senior Information Security Systems Engineer (ISSE) you will join a small

team of security engineers providing Information Assurance (IA) Architecture

Analysis and Security Engineering Support for the implementation and fielding of

the National Leadership Command Capability in support of Nuclear Command,

Control, and Communications (NC3), Continuity of Government (COG), and Senior

Leader communications. The ISSE will perform in a consultant like role providing

technical knowledge, expertise and advice to our customer. Primary

Responsibilities

The Senior ISSE shall deliver and lead threat-informed
cybersecurity products – cybersecurity risk assessments, architecture reviews,
and engineering guidance that bring sound, accurate, timely, and actionable
service to mission partners: This includes: Conduct cybersecurity risk
assessments and provide prioritized risk mitigation recommendations in support
of the customer’s mission. Support the design, implementation, and operation of
real-time capabilities to discover, detect, analyze, and mitigate threats and
vulnerabilities. Analyze candidate architectures by evaluating against defined
security requirements to identify security gaps, and provide recommended
mitigation strategy. Research and evaluate candidate emerging technologies to
determine cybersecurity effectiveness. Aid stakeholders through the development,
refinement, delivery, and implementation of innovative solutions and
capabilities. Engage stakeholders to ensure security objectives, protection
needs, security requirements and associated validation methods are defined.
Validates and verifies system security requirements definitions and analysis and
establishes system security design Designs, develops, implements and/or
integrates IA and security systems and system components including those for
networking, computing and enclave environment to include those with multiple
enclaves and with differing data protection/classification requirements Assist
architects and systems developers in the identification and implementation of
appropriate information security functionality to ensure uniform application of
Agency security policy and enterprise solutions Contributes to the security
planning, assessment, risk analysis, risk management, certification and
awareness activities for system and networking operations Reviews C&A
documentation, providing feedback on completeness and compliance of its content
CLEARANCE REQUIRED: Active TS/SCI with polygraph.

Qualifications

Bachelor of
Science degree from an accredited university ideally in Computer Science,
Information Assurance, Information Security System Engineering or related field
with a minimum of 14 years of experience as an Information Systems Security
Engineer (ISSE) or System Engineer on programs and/or contracts with the
customer space CISSP OR CASP+ certification required Confidence and ability to
present briefing to senior level DoD officials in both prepared briefings and/or
in ad hoc discussions. Expertise in the Risk Management Framework (RMF) and
conducting cybersecurity risk assessments Expertise in network technology and
systems security engineering. Experience in identifying, researching,
characterizing, and documenting security weaknesses related to operating
systems, software applications, firmware, network hardware components, as well
as network architecture design to identify protection needs and documented
policies and procedures. Experience developing and documenting system security
requirements and conducting requirements gap analysis. Experience with security
monitoring and incident response capabilities Experience with emerging
technologies such as Zero Trust, Cloud Computing, etc. Knowledge of, and
practical experience with the NIST Special Publications 800 Series, CNSSI 1253,
and DoD 8500. Ability to work independently within a schedule and with little
direction. CONMD CABARA careers.leidos.com/CONMD 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:
December 12, 2025 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
$131,300.00 - $237,350.00 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. 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. 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 Leidos
will never ask you to provide payment-related information at any part of the
employment application process. And Leidos will communicate with you only
through emails that are sent from a Leidos.com email address. 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
[email protected]. 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.

Which skills does this role require?

Information AssuranceCybersecurityRisk Management FrameworkNetwork SecurityIncident ResponseSystem SecurityArchitecture AnalysisEmerging TechnologiesZero TrustCloud ComputingCISSPCASP+Technical KnowledgeSecurity EngineeringStakeholder EngagementSecurity PlanningNIST Special PublicationsCNSSI 1253DoD 8500

Make your next move

Build a shortlist and prepare

Identify the requirements you can demonstrate, then choose examples from your work to discuss with the hiring team.

Build a focused shortlist before you applyCompare role requirements with your experience and give each application a clear reason.
Practice explaining your experience in an interviewRehearse your answers before meeting the hiring team.

Review the responsibilities and requirements before adding an opening to your shortlist.