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Linux Security Engineer Jobs in Maryland (NOW HIRING)

Castello Systems, Inc.

Mitigate STIGS/Vulnerabilities on Tenable Linux Security Center Servers and Windows/Linux Nessus Scanning Servers. * Install and update Tenable Nessus Software on Linux/Windows Scanning Servers.

Scout ET

Security Engineer

Woodlawn, MD · On-site

... Linux Enterprise 6/7 3+ years of experience performing vulnerability scanning risk analysis and coordinated technical remediation activities Regards Avinash avi (at) scoutet (dot) com 609 303 2211 ...

Mondo

Senior Linux Administrator

Owings Mills, MD · On-site

$55 - $60/hr

Experience with Linux security hardening and SELinux. Preferred Certifications: * Red Hat Certified Engineer (RHCE) * Red Hat Certified Architect (RHCA) * VMware Certified Professional (VCP) * Red ...

Fabergent

Security Engineer

Rockville, MD · On-site

Security Engineer Location : Rockville, MD Duration : 12+ months Essential Job Functions: Gather ... the Linux and Windows Operating Systems Exposure to AWS Services: EC2, S3, LAMBDA all pluses ...

Beth Page tech

Network Security Engineer

Annapolis, MD · On-site

$103K - $141K/yr

Network Security Engineer LOCATION: Annapolis,MD DURATION: 5 Years SUMMARY SECTION III. SCOPE OF ... Vulnerability management using Nessus, NMAP, Windows, Unix, and Linux OS * Packet/Protocol Analysis ...

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Linux Security Engineer information

What is a Linux security engineer?

Linux Security Engineers are IT professionals who specialize in protecting Linux-based systems and networks from security threats. They are responsible for designing, implementing, and maintaining security measures such as firewalls, intrusion detection systems, and vulnerability assessments. These engineers monitor system activity, respond to security incidents, and ensure compliance with security policies and regulations. Their expertise helps organizations keep their Linux infrastructure secure from both internal and external risks.

What are the key skills and qualifications needed to thrive as a Linux security engineer?

To thrive as a Linux Security Engineer, you need expertise in Linux system administration, cybersecurity principles, and vulnerability management, often supported by a degree in computer science or related certifications like CompTIA Security+ or RHCE. Familiarity with security tools such as SELinux, firewalls, intrusion detection systems (IDS), and scripting languages (e.g., Bash, Python) is typically required. Strong problem-solving abilities, attention to detail, and effective communication skills help you respond to incidents and collaborate with IT teams. These competencies are essential to protect systems, minimize risks, and ensure the security and integrity of critical infrastructure.

How does a Linux security engineer typically collaborate with other IT teams to enhance system security?

Linux Security Engineers work closely with network administrators, system administrators, and development teams to implement robust security measures. They often participate in cross-functional meetings to review security protocols, respond to incidents, and ensure compliance with company policies. Collaboration may involve conducting security audits, providing guidance on secure coding practices, and coordinating vulnerability assessments. This teamwork is essential to maintaining a secure infrastructure and promptly addressing emerging threats.

What is the difference between Linux Security Engineer vs Linux System Administrator?

AspectLinux Security EngineerLinux System Administrator
CertificationsCompTIA Security+, CISSP, Linux+Linux+, LPIC, RHCSA
Primary FocusSecurity vulnerabilities, threat mitigation, security policiesSystem setup, maintenance, user management
Work EnvironmentSecurity teams, cybersecurity firms, IT security departmentsIT departments, data centers, enterprise networks
ResponsibilitiesImplementing security measures, monitoring threats, incident responseInstalling OS, configuring servers, managing user access

The Linux Security Engineer specializes in protecting Linux systems from security threats, focusing on vulnerabilities and incident response. In contrast, the Linux System Administrator manages overall system health, setup, and maintenance. While both roles require Linux knowledge, security engineers focus more on safeguarding systems, whereas administrators ensure operational functionality.

What cities in Maryland are hiring for Linux Security Engineer jobs?

Cities in Maryland with the most Linux Security Engineer job openings:

Senior Linux Systems Administrator

Annapolis, MD • On-site

Leidos
IT Services • 10K+ employees
Learn more about Leidosexternal

Full-time

Retirement, PTO

Re-posted 24 days ago

Key responsibilities

  • Administer, configure, secure, monitor, and troubleshoot RHEL/Linux systems across Development, Test, and Production environments supporting mission-critical workloads.

  • Lead troubleshooting and root-cause analysis across operating systems, applications, storage, authentication, performance, and network connectivity using Linux command-line tools, system logs, and monitoring platforms.

  • Develop and maintain automation and configuration-management solutions using Ansible, Bash, Python, or comparable technologies to improve consistency, reliability, and operational efficiency.

Leidos rating

8.3

Company rating: 8.3 out of 10

Based on 153 frontline employees who took The Breakroom Quiz

82nd of 501 rated business services

Job description

Leidos has a new and exciting opportunity for a Senior Linux Systems Administrator in our Intelligence Sector, Cyber & Analytics Business Area (CABA). 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 ideal candidate brings deep hands-on Linux administration experience and is comfortable supporting mission-critical Development, Test, and Production environments using command-line tools, system logs, automation, and established change-management processes. The Linux Systems Administrator will serve as a senior technical resource responsible for system configuration, automation, security hardening, vulnerability remediation, monitoring, troubleshooting, and continuous improvement of Linux-based infrastructure and operational practices.
Primary Responsibilities
  • Administer, configure, secure, monitor, and troubleshoot RHEL/Linux systems across Development, Test, and Production environments supporting mission-critical workloads.
  • Lead troubleshooting and root-cause analysis across operating systems, applications, storage, authentication, performance, and network connectivity using Linux command-line tools, system logs, and monitoring platforms.
  • Manage Linux system lifecycle activities including account and permission administration, patching, package management, software installation, service configuration, upgrades, and ongoing system maintenance.
  • Implement and maintain Linux security controls, hardening standards, vulnerability remediation, configuration baselines, and compliance requirements.
  • Develop and maintain automation and configuration-management solutions using Ansible, Bash, Python, or comparable technologies to improve consistency, reliability, and operational efficiency.
  • Independently research and resolve complex technical issues while collaborating with SAs, DBAs, SWEs, SEs, testers, and other team members to develop sustainable solutions and promote knowledge sharing across the team.
  • Develop and maintain technical documentation, SOPs, operational runbooks, system configurations, and change records, and participate in rotational on-call support for the mission environment.

Basic Qualifications
  • Bachelor's degree in a technical discipline from an accredited college or university and ten (10) years of related experience. Five (5) years of additional related experience may be substituted for a bachelor's degree.
  • Extensive hands-on Linux systems administration experience, including RHEL or comparable enterprise Linux distributions, supporting complex production environments.
  • Experience administering Linux systems including accounts and permissions, package management, patching, system services, storage, authentication, system configuration, and performance monitoring.
  • Hands-on experience with automation or configuration management using Ansible or comparable technologies, along with Bash and/or Python scripting.
  • Strong Linux troubleshooting skills and knowledge of networking fundamentals including DNS, TCP/IP, IP addressing, ports, routing, and firewalls.
  • Experience with Linux security hardening, vulnerability remediation, configuration management, and formal change-control processes.
  • Active TS/SCI with polygraph.

Desired Qualifications
  • Advanced experience with Ansible and RHEL 9, including automated configuration, provisioning, and repeatable system administration.
  • Experience with AWS, including EC2, Systems Manager (SSM), CloudFormation, and associated monitoring and operational services.
  • Experience with FIPS, SELinux, fapolicy, STIG requirements, vulnerability remediation, and Linux security controls.
  • Experience with PKI, including certificates, keys, trusted authorities, and certificate revocation lists.
  • Experience with Git-based workflows, Terraform/CloudFormation, Salt, or other infrastructure/configuration automation technologies.
  • Experience supporting Kubernetes/container platforms and monitoring, logging, or security technologies such as Splunk, Elastic, CloudWatch, SIEM solutions, or Nessus.
  • Experience with Jira and Confluence and supporting Linux infrastructure within secure government, Intelligence Community, DoD, or similarly regulated environments.

CSSRC
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:
August 25, 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 $116,350.00 - $210,325.00
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.

What Leidos employees say

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About Leidos

Sourced by ZipRecruiter

At Leidos, we deliver innovative solutions through the efforts of our diverse and talented people who are dedicated to our customers' success. We empower our teams, contribute to our communities, and operate sustainable practices. Everything we do is built on a commitment to do the right thing for our customers, our people, and our community.

Industry

It services

Company size

10,000+ Employees

Headquarters location

Reston, VA, US

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