Cybersecurity Engineer SME

Leidos LLC; Plyers Mill Estates (MD); On-site; USD 154,000 - 278,000; Full time

Benefits offered by this job

Paid Time Off

Holidays (11)

401K match

Flexible schedule

Discounted stock plan

Education support

Parental leave

Job summary

Leidos is seeking a Cybersecurity Engineer SME to protect customer information systems and support DevSecOps across the lifecycle. You will design, implement, and maintain security controls while collaborating with ISSEs, ISSMs, developers, and government stakeholders to ensure compliance with policies and standards.

Required: MS degree with 15+ years of relevant experience, active TS/SCI with poly, and certifications such as CISSP or CEH. Experience with RMF/ATO and cloud security is a plus.

Qualifications

• Experience implementing and managing SIEM tools such as Splunk.
• Experience with endpoint and network security technologies (IDS/IPS, HBSS/Trellix).
• Experience reviewing cybersecurity event logs for indicators of compromise.
• Experience supporting incident response plans, vulnerability management, RMF/ATO.
• Experience conducting cybersecurity assessments and security audits.
• Experience identifying system vulnerabilities and non-compliance.
• Experience reviewing vulnerability scans with DevSecOps for remediation.
• Experience supporting RMF authorization and risk posture discussions.
• Experience tracking POA&Ms with ISSOs/ISSEs/SCAs.
• Professional cybersecurity certifications (Security+, CISSP, CySA+, CEH, GCIH).
• Education: MS degree and 15+ years of experience; or substitutions accepted.
• Active TS/SCI with polygraph required.

Responsibilities

• Plan, implement, manage, monitor, and upgrade security controls and tools.
• Design, configure, implement, troubleshoot, and maintain security technologies (firewalls, HBSS/Trellix, SIEM).
• Monitor security using SIEM (Splunk) to detect, analyze, and respond to threats.
• Support investigation and remediation of cybersecurity incidents.
• Participate in change management to ensure security compliance.
• Audit systems for compliance with cybersecurity policies and baselines.
• Collaborate with DevSecOps teams to integrate security into pipelines.
• Stay informed on advisories and threat intelligence.
• Assist with secure configurations and compliance requirements.
• Support vulnerability management and remediation coordination.

Skills

Splunk SIEM

HBSS Trellix

DevSecOps

Python

PowerShell

RMF/ATO

Cloud: AWS/GCP

Linux (RedHat)

Threat intel

Incident response

Education

MS degree

TS/SCI with poly

Tools

HBSS/Trellix

Splunk

Nessus

STIGs

Ansible

CloudFormation

Job description

Leidos has an exciting opportunity for Cybersecurity Engineer SME in our Intel Security Sector's Analysis Solutions Business Area.

Our talented team is at the forefront in Security Engineering, Computer Network Operations (CNO), Mission Software, Analytical Methods and Modeling, Signals Intelligence (SIGINT), and Cryptographic Key Management.

At Leidos, we offer competitive benefits, including Paid Time Off, 11 paid Holidays, 401K with a 6% company match and immediate vesting, Flexible Schedules, Discounted Stock Purchase Plans, Technical Upskilling, Education and Training Support, Parental Paid Leave, and much more.

Join us and make a difference in National Security!

Job Summary

The Cybersecurity Engineer SME is responsible for protecting the customer’s information systems, networks, and infrastructure from cyber threats and vulnerabilities. This role supports the design, implementation, and maintenance of security controls that safeguard mission systems and ensure compliance with applicable cybersecurity policies, standards, and regulatory frameworks. The Cybersecurity Engineer SME will work closely with Information Systems Security Engineers (ISSEs), Information Systems Security Managers (ISSMs), software developers, systems engineers, and government stakeholders throughout the DevSecOps lifecycle. The candidate will perform a full spectrum of cybersecurity engineering activities, including implementing security technologies, supporting incident response efforts, and ensuring systems meet required security and compliance standards.

Primary Responsibilities

• Plan, implement, manage, monitor, and upgrade security controls and tools used to protect enterprise systems and networks, while identifying opportunities to automate repeatable operations tasks.
• Design, configure, implement, troubleshoot, and maintain security technologies such as firewalls (security groups), endpoint protection tools (HBSS/Trellix), SIEM platforms (Splunk).
• Monitor system and network security using Security Information and Event Management (SIEM) tools such as Splunk Enterprise Security to detect, analyze, and respond to potential threats or anomalous activity.
• Support the investigation and remediation of cybersecurity incidents, including system or network breaches and malware infections.
• Participate in change management processes to ensure system changes maintain security compliance and do not introduce new vulnerabilities.
• Audit systems and configurations to ensure compliance with established cybersecurity policies, standards, and secure configuration baselines.
• Collaborate with engineering, development, and operations teams to integrate security controls into DevSecOps pipelines and system architectures.
• Continuously monitor security advisories, bulletins, and industry threat intelligence to stay informed of current vulnerabilities, threats, and trends.
• Assist with the implementation and enforcement of secure system configurations and cybersecurity compliance requirements.
• Support vulnerability management activities by reviewing scan results, assessing risk, and coordinating remediation efforts with system owners and technical teams.

Basic Qualifications

• Experience implementing and managing Security Information and Event Management (SIEM) tools such as Splunk or similar platforms.
• Experience working with endpoint and network security technologies, including IDS/IPS, HBSS/Trellix, and related defensive security tools.
• Experience reviewing and analyzing cybersecurity event logs to identify indicators of compromise or suspicious activity.
• Experience supporting incident response plans, vulnerability management programs, risk management plans, and Plans of Action and Milestones (POA&Ms).
• Experience conducting or supporting technical cybersecurity assessments and security audits.
• Experience identifying system vulnerabilities and instances of non-compliance with cybersecurity standards and regulatory requirements.
• Experience collaborating with DevSecOps teams to review vulnerability scan results and support remediation of findings.
• Experience supporting the Risk Management Framework (RMF) authorization process by reviewing security documentation and providing risk-based recommendations to stakeholders regarding system risk posture as part of Authority to Operate (ATO) activities.
• Manage and track Plans of Action and Milestones (POA&Ms) for customer-sponsored systems, coordinating with key stakeholders including ISSOs, ISSEs, ISSMs, and Security Control Assessors (SCAs).
• Experience applying system security engineering principles in areas such as system security design, lifecycle engineering, authentication and authorization mechanisms, cryptography, intrusion detection, contingency planning, incident handling, auditing, configuration management, and change control.
• Professional cybersecurity certifications such as Security+, CISSP, CySA+, CEH, or GCIH.
• Education/Experience: Requires MS degree and 15 or more years of prior relevant experience. Additional years of experience may be substituted in lieu of a degree.
• To be considered must have an active TS/SCI with polygraph security clearance.

Preferred Qualifications

• Experience with cybersecurity tools such as Rapid7, Tenable/Nessus, HBSS/Trellix, SonarQube, or endpoint detection and response (EDR) platforms, as well as using STIG viewers and compliance tools to assess systems against established security configuration baselines.
• Experience implementing and managing network and application firewalls, incident detection platforms, and digital forensic tools.
• Experience with automation tools such as Ansible or CloudFormation to support infrastructure and security automation.
• Experience with Agile software development environments and scripting/programming languages such as Python or PowerShell. (e.g., React).
• Familiarity with cloud computing environments, including AWS, Oracle Cloud, or Google Cloud Platform (GCP).
• Experience with system monitoring and health tools such as SolarWinds.
• Experience working with DevSecOps pipelines and CI/CD security tools.
• Experience administering or securing systems in Linux environments (RedHat).

At Leidos, the opportunities are boundless. We challenge our staff with interesting assignments that allow them to thrive professionally and personally. For us, helping you grow your career is good business.

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.

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.

Original Posting: April 3, 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 $154,050.00 - $278,475.00 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 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.

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 [e-mail].