Calvin Chui

Background

About Calvin Chui

I’m a Cybersecurity Engineer with 9+ years of experience designing, building, and securing enterprise-scale information systems in support of DoD and defense programs. I hold numerous active certifications including CISSP, OSCP, CompTIA Linux+, and Security+. At Lockheed Martin, I’ve led cybersecurity engineering efforts across both classified and unclassified environments — from implementing NIST, CNSSI, and JSIG controls to ensuring systems achieve and maintain ATO accreditation. I specialize in system hardening, vulnerability management, and DevSecOps practices, with hands-on expertise in tools such as Nessus, DISA STIGs, Ansible, Docker, AWS EC2, Kali Linux, Trellix ESS, VMware, and Splunk. My work bridges compliance and technical implementation: integrating STIG compliance into CI/CD pipelines for Linux containers, validating exploit protection, and configuring Windows Server, Active Directory, and enterprise network infrastructure (HPE/Cisco/SANs) to align with DoD security standards. Beyond the technical side, I mentor junior engineers, translate complex security requirements into actionable tasks for production teams, and partner with stakeholders to deliver secure, mission-ready systems. I’m passionate about advancing secure system design, strengthening vulnerability management programs, and building solutions that enable critical defense missions.