Unix Operating System

Unix Operating System Cybersecurity Jobs

3 jobs found

Today

Security Engineer III, Red Team Operator

Deloitte Rosslyn, VA

Rosslyn, VA

Today

$111k - $218k/yr Full time Active Directory Bloodhound Burp Suite

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Job Description

Deloitte’s Cyber Defense & Resilience team is seeking a Security Engineer III to support authorized adversary emulation and assessment activities. In this role, you will plan and execute red team operations designed to test detection, response, and resilience across enterprise environments.

This onsite position is based in Rosslyn, VA, with a focus on realistic attack simulation, post-exploitation activities, and clear reporting back to technical and leadership stakeholders.

Responsibilities

Plan and execute red team operations across enterprise environments, web applications, cloud platforms, and endpoints.
Emulate advanced threat actors using realistic attack paths, tools, and techniques.
Run reconnaissance and simulation sequences for initial access, privilege escalation, lateral movement, persistence, and exfiltration.
Assess the effectiveness of security controls, monitoring, and incident response processes.
Conduct phishing, social engineering, and credential-focused exercises when explicitly authorized.
Develop custom payloads, scripts, and attack workflows to support engagements.
Document findings, attack chains, gaps in defenses, and recommendations for remediation.
Provide after-action reports and debriefs to technical and leadership stakeholders.
Partner with blue teams, detection engineers, and security leadership to strengthen defensive capabilities.
Follow strict rules of engagement, legal requirements, and operational safety procedures.

Requirements

Bachelor’s degree in Cybersecurity, Computer Science, Information Systems, Engineering, or a related technical field.
Active Top-Secret Clearance.
Ability to work onsite up to 5 days a week.
Knowledge of network architecture, protocols, and techniques such as tunneling.
Hands-on offensive security experience in red teaming, purple teaming, or adversary simulation.
Strong understanding of enterprise attack techniques across Windows, Active Directory, Linux, cloud, and identity environments.
Experience with command and control frameworks, privilege escalation, lateral movement, and evasion techniques.
Tool proficiency including Cobalt Strike, Mythic, Metasploit, BloodHound, Burp Suite, Nmap, and PowerShell or Python.
Experience mapping to MITRE ATT&CK and performing threat emulation.
Ability to write high-quality reports that connect technical findings to business risk.
CRTO (Certified Red Team Operator) or OSCP (Offensive Security Certified Professional).
Ability to travel about 20% on average based on client needs and industries served.
Legal authorization to work in the United States without employer sponsorship, now or in the future.
Ability to work independently and collaborate with a team.
Effective written and verbal communication skills.
Meticulous attention to detail and strong work product quality.
Ability to build and sustain professional relationships.
Ability to lead projects or workstreams.
Capability to manage and prioritize multiple tasks in a fast-paced environment.
Strong interpersonal skills and professional demeanor.
Ability to meet deadlines.
Ability to provide clear guidance to others.

Technologies

Cobalt Strike, Mythic, Metasploit, BloodHound, Burp Suite, Nmap
PowerShell, Python
MITRE ATT&CK, Active Directory
Windows, Linux
C2 frameworks, Havoc, Sliver
AWS, Azure, GCP
SIEM, EDR

Preferred

Experience with C2 frameworks such as Cobalt Strike, Havoc, Mythic, and Sliver.
Experience with cloud red teaming in AWS, Azure, or GCP.
Familiarity with detection engineering, SIEM, EDR, and purple team exercises.
Experience developing custom tooling or modifying public offensive tools.
Knowledge of malware analysis, reverse engineering, or exploit development.

Compensation

The estimated wage range for this role is $110,700 - $218,300 per year, based on multiple factors used to determine compensation.

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1mo ago

Information Systems Security Engineer / ISSE (HPC)

AMERICAN SYSTEMS Arlington, VA

Arlington, VA

1mo ago Closed

$165k - $200k/yr Full time Business Systems Cybersecurity Tools Engineer

This position is no longer accepting applications (closed Aug 14, 2026).

Job Description

AMERICAN SYSTEMS is seeking an experienced Information Systems Security Engineer to support Red Hat Enterprise Linux and Windows within a High Performance Computing environment in Arlington, Virginia. This role centers on security architecture design, RMF and JSIG artifact development, rigorous assessments, and ongoing compliance to safeguard critical HPC systems in a federal setting.

Below is a detailed outline of the position and its requirements, outlining responsibilities, qualifications, and the broader context of the role.

Responsibilities

Develop and deploy enterprise security architectures for RHEL within an HPC SAP environment.
Apply JSIG requirements to system authorization, control implementation, and documentation.
Manually craft RMF and JSIG artifacts, including SSPs, control narratives, POA&Ms, and supporting evidence.
Conduct hands-on security assessments on Linux and Windows systems, including CLI audits, compliance scans, log reviews, and control validation.
Analyze scan results to identify gaps and support remediation planning and execution.
Validate and implement host-based firewall and security configurations in collaboration with system administrators.
Manage and track POA&Ms through mitigation, remediation, or risk acceptance.
Ensure ongoing system compliance through continuous monitoring of controls, procedures, and documentation.
Identify security deficiencies and provide actionable remediation recommendations.
Support system recovery and security oversight after outages or incidents.
Participate in change management activities, assessing security impacts to SAP systems.
Support security investigations, incident response, and remediation activities.
Collaborate with engineering teams to integrate security requirements into system design and production releases.

Requirements

Active Top Secret/SCI with SAP eligibility.
Bachelor’s degree in a STEM discipline with 11–12 years of relevant experience.
Master’s degree with 8–10 years of relevant experience.
Minimum 5 years designing and implementing enterprise-scale security solutions with hands-on security assessment experience across Linux systems, including command-line validation.
DoD 8140 IAT Level III–equivalent certification (for example, SecurityX, CISSP, CCNP Security, CISA, GCED, GCIH, or CCSP).
Strong background in RMF, ICD 503, NIST SP 800-53, DCID 6/3, or current DoD authorization practices.
Working knowledge of the JSIG and its application to RMF authorization.
Proven experience authoring RMF/JSIG artifacts by hand, without reliance on automated RMF tools (eMASS, Xacta, etc.).
Experience supporting security tools such as Splunk Enterprise, HBSS, McAfee ePO, ENS, and DLP.
Demonstrated security engineering experience across Linux, Windows, Cisco platforms, databases (SQL or Oracle), and virtualized environments.

Technologies

RHEL, Windows, Linux, SAP
Splunk Enterprise, HBSS, McAfee ePO, ENS, DLP
eMASS, Xacta, SQL, Oracle
Cisco, Virtualized environments
JSIG, RMF

Benefits

Sign-on bonus
Healthcare benefits
Paid leave
Retirement plans
Insurance programs
Education and training assistance

Overview

AMERICAN SYSTEMS, a 100 percent employee-owned federal contractor, seeks a seasoned ISSE to support RHEL and Windows within an HPC environment in Arlington, VA. The role includes a $10,000 sign-on bonus in addition to a competitive compensation package.

Pay Transparency Statement

AMERICAN SYSTEMS is committed to pay transparency for applicants and employee-owners. The salary range for this position is USD $165,000.00/Yr. to USD $200,000/Yr. Actual compensation will be determined based on several factors permitted by law. The company offers a comprehensive benefits program including healthcare, paid leave, retirement plans, insurance programs, and education and training assistance.

EEO Statement

AMERICAN SYSTEMS is an equal opportunity employer. EEO Race/Sex/Disability Status/Veteran Status.

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1mo ago

Application Security Engineer

Booz Allen Hamilton Honolulu, HI

Honolulu, HI

1mo ago Closed

$87k - $198k/yr Full time Application Security Certificate Management Cyber Security

This position is no longer accepting applications (closed Aug 11, 2026).

Job Description

Application Security Engineer duties center on DoD enterprise security architecture with emphasis on F5 BIG-IP, inline break-and-inspect proxies, TLS/mTLS, PKI, and cloud security modernization.

Responsibilities

Contribute to DoD enterprise security architecture initiatives, aligning cloud modernization with mission needs.
Design, deploy, and administer F5 BIG-IP platforms to support secure application delivery.
Implement and manage inline break-and-inspect solutions, including reverse proxy and forward proxy configurations.
Configure and troubleshoot TLS and mutual TLS on proxies to ensure strong authentication and encryption.
Collaborate with DoD clients and stakeholders to troubleshoot issues within the enterprise architecture.
Apply cryptographic knowledge of TLS, mTLS, hashing algorithms, and PKI to secure communications.
Maintain secure, compliant environments as part of ongoing cloud security modernization efforts.

Requirements

3+ years of experience supporting DoD enterprise architecture.
3+ years designing, implementing, and administering F5 BIG-IP.
3+ years implementing In-Line Break and Inspect solutions, including reverse and forward proxies.
Experience configuring and troubleshooting TLS and mutual TLS on a proxy.
Experience working with DoD clients and stakeholders to troubleshoot issues in an enterprise architecture.
Knowledge of cryptography protocols and standards, including TLS, mTLS, hashing algorithms, and PKI.
Active Secret clearance.
High School Diploma or GED.

Technologies

F5 BIG-IP
Office 365
RDP
SSH
CLI
TLS
mTLS
PKI
Linux
UNIX

Benefits

Health, life, disability, financial, and retirement benefits
Paid leave
Professional development
Tuition assistance
Work-life programs
Dependent care
Recognition awards program
Comprehensive benefits information available on Booz Allen Careers site

The Opportunity

As a cloud computing infrastructure architect, you will leverage enterprise cloud platforms to help clients modernize IT infrastructure and meet challenging missions in support of national security. You will work with the latest technologies and collaborate with skilled teammates on both legacy modernization and new development initiatives.

NICE IF YOU HAVE

Experience using Office 365 applications, including Teams
Experience working in DoD Cloud and on-premises cloud environments
Experience interacting with tools through RDP, web-based UI, SSH, and CLI
Knowledge of federal compliance standards, including NIST 800-53, FIPS, DoD STIG, and FedRAMP
Knowledge of Linux or UNIX environments, including navigating and troubleshooting basic OS issues
Knowledge of networking protocols

Clearance

Secret clearance is required.

Compensation

The projected compensation range for this position is USD 86,900.00 to 198,000.00 annually. Final offer depends on location, education, experience, and contract requirements. Booz Allen provides a comprehensive benefits package and opportunities for professional development.

Identity Statement

The hiring process may include identity verification using advanced biometrics and AI to ensure authenticity and prevent fraud. Interviews and assessments may require you to be on camera, and Booz Allen may capture images to verify identity.

Candidate AI Usage Policy

AI tools are part of Booz Allen's daily work, with a commitment to fair candidate processes based on skills. The use of AI or other tools to assist with interview responses is prohibited unless explicitly permitted.

Work Model

Work model options include Remote, Hybrid, and Onsite. Remote roles may require in-person work at Booz Allen or a customer facility. Hybrid roles require frequent presence at Booz Allen facilities and may include visits to customer sites. Onsite roles are primarily performed at a Booz Allen or customer facility in collaboration with teams.

Commitment to Non-Discrimination

All qualified applicants will receive consideration for employment without regard to disability, protected veteran status, or any other status protected by applicable law.

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Unix Operating System Cybersecurity Jobs

Security Engineer III, Red Team Operator

Information Systems Security Engineer / ISSE (HPC)

Application Security Engineer

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