Senior Cybersecurity Architect — Zero Trust & Compliance Leader

Castelion Corporation; Torrance (CA); On-site; USD 150,000 - 190,000; Full time

Benefits offered by this job

Stock incentives

Medical insurance

Vision insurance

Dental insurance

Paid time off

Job summary

Castelion Corporation in Torrance, CA is seeking a Senior Cybersecurity Architect to lead design and implementation of secure, resilient information security systems across local and remote sites. This hands-on role translates mission and regulatory requirements into end-to-end cybersecurity solutions, enforcing workflows and security measures.

You will collaborate with IT, software development, operations, engineering, manufacturing, and legal to ensure controls meet technical and regulatory

Qualifications

• 7-10+ years in cybersecurity engineering or related fields.
• Strong background in network security, endpoint protection, access control, and vulnerability management.
• Experience with modern security tools (CrowdStrike, Palo Alto, Nessus, Splunk, Snort).
• Experience with incident response, malware analysis, and penetration testing.
• Cloud security experience (AWS, Azure, or GCP).
• Understanding of security principles, threats, and frameworks (NIST, CIS Controls, MITRE ATT&CK).
• U.S. security clearance eligibility.

Responsibilities

• Define and implement security architectures aligned with Zero Trust principles, defense‑in‑depth, and least‑privilege models.
• Develop security reference architectures, patterns, and standards for enterprise and program‑level systems.
• Ensure cybersecurity is embedded across the full system lifecycle (requirements, design, development, test, deployment, sustainment).
• Design, implement, and maintain cybersecurity tools and systems, including firewalls, EDR, IDS/IPS, SIEM, and vulnerability scanners.
• Conduct threat modeling, security risk assessments, and vulnerability analyses.
• Proactively monitor security events, investigate suspicious activity, and respond to incidents with urgency and precision.
• Develop and maintain System Security Plans (SSPs), POA&Ms, and supporting documentation for audits and assessments.
• Partner with IT, engineering, DevSecOps, and Program Security to integrate security into infrastructure and application design.
• Manage security patching cycles and lead remediation efforts based on risk assessments.
• Support audit, compliance, and risk management activities (e.g., NIST, CMMC, & others) and manage supply chain cybersecurity concerns.
• Conduct regular internal audits and readiness checks in preparation for external audits or DoD reviews.
• Serve as on‑site cybersecurity expert for Torrance HQ and occasionally travel (5-10%) to other locations (TX/NM).

Skills

Cybersecurity engineering

Network security

Cloud security

Incident response

Threat modeling

Documentation

Communication

NIST/CMMC/ISO 27001

Tools

CrowdStrike

Palo Alto

Nessus

Splunk

Snort

Job description

Castelion Corporation in Torrance, CA is seeking a Senior Cybersecurity Architect to lead design and implementation of secure, resilient information security systems across local and remote sites. This hands-on role translates mission and regulatory requirements into end-to-end cybersecurity solutions, enforcing workflows and security measures.

You will collaborate with IT, software development, operations, engineering, manufacturing, and legal to ensure controls meet technical and regulatory