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Senior Security Engineer
LeidosSenior Security Engineer securing Kudu Dynamics’ AI-cyber development environments, supply chains, and pipelines. Hardening Linux, cloud, on-prem, and classified infrastructure while supporting continuous ATO.
Posted 8/24/2026full-timeChantilly • Colorado, Maryland, Ohio, Texas, Virginia • 🇺🇸 United StatesSenior💰 $131,300 - $237,350 per yearWebsite
Core Competencies
Role fitCore Competencies
Use this summary to align your resume positioning with the role.
Demonstrates expertise in security engineering, secure software development, and infrastructure security, with a strong focus on threat modeling, vulnerability management, and secure design practices. Proficient in hardening software deployments and managing security outcomes across diverse environments, including cloud and on-premises systems.
Highest-signal resume keywords
Security EngineeringThreat ModelingVulnerability ManagementSecure Software DevelopmentInfrastructure Security
ATS Keywords
Tailor your resumeApplicant Tracking System Keywords
Tip: use these terms in your resume and cover letter to boost ATS matches.
Hard Skills
PythonThreat ModelingVulnerability ManagementInfrastructure-As-CodeContainerizationCI/CD AdministrationLinux SecurityNetwork ProtocolsCryptographic FundamentalsAgentic Tooling
Soft Skills
Influencing Engineering TeamsAdvising on Security Risks
Tools & Technologies
AnsibleTerraformDockerKubernetesGitLab CIJenkinsContinuous ATO WorkflowsSIEM
Certifications & Qualifications
CISSPOSCPGCIH
Industry Keywords
NIST RMFContinuous Vulnerability ManagementCross-Domain SolutionsEmbedded PlatformsRed TeamingPenetration TestingAI RMF
Tech Stack
Tools & technologiesAnsibleCloudDockerJenkinsKubernetesLinuxPythonTerraform
About the role
Key responsibilities & impact- Own the security posture of environments used to build, test, and deliver advanced AI-cyber capabilities
- Embed with software engineers, reverse engineers, and vulnerability researchers
- Harden infrastructure, software supply chains, and development pipelines
- Guide secure software development and evolution of software vulnerability tooling
- Guide and review build integrity and supply-chain security
- Threat model internal tooling
- Assess API integrations and AI/LLM orchestration
- Maintain tool security posture using continuous ATO review workflows and pipelines
- Support ATO and continuous vulnerability management
- Advise engineering teams on genuine security risks versus noise
- Scale threat detection and response capabilities
Requirements
What you’ll need- 8+ years of professional experience in security engineering, secure software development, or infrastructure security
- Experience securing and using agentic tooling for writing and maintaining production code, managing cloud infrastructure, and release management frameworks
- Experience owning security outcomes for a technical product from ideation to production and influencing engineering teams toward secure design without direct authority
- Experience hardening software deployments, networks, and production infrastructure at scale
- Experience securing software clusters for online/cloud as well as on-prem or air-gapped installations
- Experience with threat modeling, vulnerability management, and secure development practices across first- and third-party code
- Familiarity with NIST RMF, continuous ATO, and control automation
- 15+ years of hands-on experience securing and hardening Linux systems at the OS and network layer
- Expertise in at least one scripting language, Python preferred
- Working knowledge of network protocols, cryptographic fundamentals, and key management
- Experience with infrastructure-as-code and containerization, including Ansible/Terraform and Docker/Kubernetes
- Experience administering or securing a CI/CD system, such as GitLab CI or Jenkins
- Relevant certifications such as CISSP, OSCP, or GCIH are useful but not required
- Experience working in accredited/classified environments, including cross-domain solutions
- Offensive security background, including penetration testing, red team, or serious CTF experience
- Detection engineering or SIEM experience
- Experience with embedded, real-time, or otherwise constrained platforms
- Exposure to reverse engineering or vulnerability research
- Knowledge of non-human/agent identity and secrets management
- Experience with sandboxing and egress control for code-executing agents
- Familiarity with NIST AI RMF
- Experience using LLMs for control narrative drafting, evidence collection, and POA&M triage
Benefits
Comp & perks- 🌐 Worldwide ❌ Jobs You've Hidden ⭐️ Saved Jobs ✅ Applied Jobs ✉️ Email Alerts 👤 Account Leidos Website LinkedIn All Job Openings 10,000+ employees Founded 1969 🏥 Healthcare 💼 Consulting 📦 Logistics Healthcare
- Consulting
- Logistics Leidos is a leading systems integrator in science, technology, and engineering, providing solutions that transform and enable the missions of its customers. The company operates across various markets, including aviation, defense, energy, government, healthcare, intelligence, science, and space. Leidos is involved in AI, digital modernization, cyber operations, and integrated and mission software systems. With a commitment to diversity, equity, inclusion, and sustainability, Leidos also engages in charitable efforts and community enrichment programs. Additionally, it contributes to developing solutions for counter-unmanned aerial systems and electric vehicle infrastructure for military applications. Senior Security Engineer 🔥 0 minutes ago 🏢 Chantilly – Onsite 💵 $131.3k - $237.3k / year ⏰ Full Time 🟠 Senior 👮♂️ Cybersecurity / Security Engineer 🦅 H1B Visa Sponsor 👻 Ghost score 0% Ansible Cloud Docker Jenkins Kubernetes Linux Python Terraform Apply Now Customize resume + cover letter Report problem ☆ Save ☑️ Mark as applied ❌ Hide 📋 Description
- Own the security posture of environments used to build, test, and deliver advanced AI-cyber capabilities
- Embed with software engineers, reverse engineers, and vulnerability researchers
- Harden infrastructure, software supply chains, and development pipelines
- Guide secure software development and evolution of software vulnerability tooling
- Guide and review build integrity and supply-chain security
- Threat model internal tooling
- Assess API integrations and AI/LLM orchestration
- Maintain tool security posture using continuous ATO review workflows and pipelines
- Support ATO and continuous vulnerability management
- Advise engineering teams on genuine security risks versus noise
- Scale threat detection and response capabilities 🎯 Requirements
- 8+ years of professional experience in security engineering, secure software development, or infrastructure security
- Experience securing and using agentic tooling for writing and maintaining production code, managing cloud infrastructure, and release management frameworks
- Experience owning security outcomes for a technical product from ideation to production and influencing engineering teams toward secure design without direct authority
- Experience hardening software deployments, networks, and production infrastructure at scale
- Experience securing software clusters for online/cloud as well as on-prem or air-gapped installations
- Experience with threat modeling, vulnerability management, and secure development practices across first- and third-party code
- Familiarity with NIST RMF, continuous ATO, and control automation
- 15+ years of hands-on experience securing and hardening Linux systems at the OS and network layer
- Expertise in at least one scripting language, Python preferred
- Working knowledge of network protocols, cryptographic fundamentals, and key management
- Experience with infrastructure-as-code and containerization, including Ansible/Terraform and Docker/Kubernetes
- Experience administering or securing a CI/CD system, such as GitLab CI or Jenkins
- Relevant certifications such as CISSP, OSCP, or GCIH are useful but not required
- Experience working in accredited/classified environments, including cross-domain solutions
- Offensive security background, including penetration testing, red team, or serious CTF experience
- Detection engineering or SIEM experience
- Experience with embedded, real-time, or otherwise constrained platforms
- Exposure to reverse engineering or vulnerability research
- Knowledge of non-human/agent identity and secrets management
- Experience with sandboxing and egress control for code-executing agents
- Familiarity with NIST AI RMF
- Experience using LLMs for control narrative drafting, evidence collection, and POA&M triage Apply Now 📊 Check your resume score for this job Improve your chances of getting an interview by checking your resume score before you apply. Check Resume Score Similar Jobs Information Systems Security Engineer – ISSE 🕒 4 days ago Markon 501 - 1000 🎖️ Defense 📦 Logistics 🏛️ Government Website LinkedIn All Job Openings Information Systems Security Engineer protecting mission-critical intelligence systems for Markon, a federal consulting firm. Embedding security controls, assessing vulnerabilities, and supporting authorization throughout system lifecycles. 🏢 Chantilly – Onsite 💵 $170k - $195k / year ⏰ Full Time 🟠 Senior 🔴 Lead 👮♂️ Cybersecurity / Security Engineer Cloud Cyber Security TypeScript Information System Security Officer – Mid-Level 🕒 August 6 AT&T 10,000+ employees 📡 Telecommunications Website LinkedIn All Job Openings Mid-Level ISSO securing AT&T Federal Solutions systems supporting U.S. government intelligence missions. Conducting RMF, audits, incident response, and ATO support onsite in Chantilly. 🏢 Chantilly – Onsite 💵 $98.1k - $115k / year ⏰ Full Time 🟡 Mid-level 🟠 Senior 👮♂️ Cybersecurity / Security Engineer 🦅 H1B Visa Sponsor Cyber Security TypeScript Lead Information System Security Officer – Program Level 3 🕒 July 23 AT&T 10,000+ employees 📡 Telecommunications Website LinkedIn All Job Openings ISSO Lead providing expertise in information security solutions for AT&T Federal Solutions. Responsibilities include managing classified data protection and ensuring compliance with security standards. 🏢 Chantilly – Onsite 💵 $108k - $170k / year ⏰ Full Time 🟠 Senior 👮♂️ Cybersecurity / Security Engineer 🦅 H1B Visa Sponsor Information Systems Security Engineer 🕒 June 9 Markon 501 - 1000 🎖️ Defense 📦 Logistics 🏛️ Government Website LinkedIn All Job Openings Information System Security Engineer performing ISSE activities throughout the system development lifecycle for Markon. In-depth knowledge of secure systems engineering, firewall administration, and cybersecurity practices are required. 🏢 Chantilly – Onsite 💵 $150k - $180k / year ⏰ Full Time 🟡 Mid-level 🟠 Senior 👮♂️ Cybersecurity / Security Engineer Cloud Cyber Security TypeScript Senior Security Engineer – Government 🕒 May 29 AT&T 10,000+ employees 📡 Telecommunications Website LinkedIn All Job Openings Senior Security Engineer supporting secure IT operations for the Federal Government. Handling systems administration, threat detection, incident response, and secure technology integration. 🏢 Chantilly – Onsite 💵 $98.1k - $220k / year ⏰ Full Time 🟠 Senior 👮♂️ Cybersecurity / Security Engineer 🦅 H1B Visa Sponsor Cloud ITSM Linux ServiceNow Splunk TypeScript VMware View More Security Engineer Jobs 🌐 Worldwide Built by Lior Neu-ner. I'd love to hear your feedback — Get in touch via DM or support@remoterocketship.com Search Remote jobs Search Jobs by country Search jobs by city Search jobs by job title Search entry-level jobs Search junior-level jobs Search senior-level jobs Search jobs by tech stack Search jobs by contract type Search remote internships Search remote part-time jobs Remote jobs Anywhere in the World Companies Hiring Anywhere in the World Companies Hiring Sales People Anywhere in the World Companies Hiring Software Engineers Anywhere in the World Resources Advice Tips for finding remote jobs Interview questions and answers Resume examples Cover letter examples Post a job Affiliates About us Is Remote Rocketship legit? Privacy policy Terms of service Job board SEO course Remote Job Search MasterClass Resume Review AI Apply Copilot OpenClaw job finder API docs Find jobs using your resume Jobs by Country Remote jobs anywhere in the world (Worldwide remote jobs) Remote jobs United States Remote jobs Australia Remote jobs Brazil Remote jobs Canada Remote jobs France Remote jobs Ireland Remote jobs Germany Remote jobs Netherlands Remote jobs Spain Remote jobs UK Popular Jobs Remote data analyst jobs Remote customer support jobs Remote executive assistant jobs Remote marketing jobs Remote product designer jobs Remote product manager jobs Remote project manager jobs Remote recruiter jobs Remote sales jobs Remote software engineer jobs Jobs by Type Remote full-time jobs Remote part-time jobs Remote contract jobs Remote internship jobs Remote entry-level jobs Remote jobs with no experience required Remote junior jobs (1-3 years of experience) Digital nomad jobs Remote jobs with no degree required Freelance remote jobs Temporary remote jobs Remote jobs hiring now Stay at home mom jobs