Senior Cyber Security Engineer

LEXSO

RemotePosted July 28, 2026

About the role

Senior Cyber Security Engineer available for a remote role in Fairfax County, Virginia, United States. This position bridges compliance and engineering to build secure systems, owns the cybersecurity workstream end-to-end, and aims to achieve Authority to Operate (ATO) under DoD RMF and other federal certifications while embedding security automation into CI/CD pipelines. You will work with backend and frontend engineers to harden a microservices architecture against evolving threats, identify security gaps, drive architectural decisions, and shepherd remediation to completion.

Senior Cyber Security Engineer

LEXSO

RemotePosted July 28, 2026

About the role

Senior Cyber Security Engineer available for a remote role in Fairfax County, Virginia, United States. This position bridges compliance and engineering to build secure systems, owns the cybersecurity workstream end-to-end, and aims to achieve Authority to Operate (ATO) under DoD RMF and other federal certifications while embedding security automation into CI/CD pipelines. You will work with backend and frontend engineers to harden a microservices architecture against evolving threats, identify security gaps, drive architectural decisions, and shepherd remediation to completion.

Responsibilities

Own the cybersecurity program end-to-end from gap identification through design and implementation tracking.
Report cyber risk posture and remediation progress; translate findings for leadership.
Define and maintain the cybersecurity requirements backlog and progress-tracking cadence.
Lead RMF processes to achieve and maintain ATO for the LEXSO platform.
Implement controls per NIST SP 800-53 and DoD STIGs; generate artifacts for eMASS (SSPs, POAMs, SARs).
Conduct self-assessments using ACAS (Nessus) and SCC to identify vulnerabilities.
Integrate SAST/DAST tools (e.g., SonarQube, OWASP ZAP) into GitLab/GitHub CI/CD.
Develop scripts (Python, Bash, Ansible) to automate patching and configuration management for Linux (RHEL/Ubuntu).
Implement container security scanning for Docker/Kubernetes; enforce Security as Code with Terraform or Helm.
Harden APIs and microservices with secure authentication (OAuth2/JWT/mTLS) and FIPS 140-2 encryption.
Respond to zero-day thre

Responsibilities

Own the cybersecurity program end-to-end from gap identification through design and implementation tracking.
Report cyber risk posture and remediation progress; translate findings for leadership.
Define and maintain the cybersecurity requirements backlog and progress-tracking cadence.
Lead RMF processes to achieve and maintain ATO for the LEXSO platform.
Implement controls per NIST SP 800-53 and DoD STIGs; generate artifacts for eMASS (SSPs, POAMs, SARs).
Conduct self-assessments using ACAS (Nessus) and SCC to identify vulnerabilities.
Integrate SAST/DAST tools (e.g., SonarQube, OWASP ZAP) into GitLab/GitHub CI/CD.
Develop scripts (Python, Bash, Ansible) to automate patching and configuration management for Linux (RHEL/Ubuntu).
Implement container security scanning for Docker/Kubernetes; enforce Security as Code with Terraform or Helm.
Harden APIs and microservices with secure authentication (OAuth2/JWT/mTLS) and FIPS 140-2 encryption.
Respond to zero-day thre

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