Infrastructure Security Engineer

We are looking for an Infrastructure Security Engineer to help secure one of Hong Kong's largest GPU computing environments, supporting cutting-edge Linux-based AI and High Performance Computing (HPC) workloads in a highly specialized on-premises environment.

This is a unique opportunity to gain real-world security engineering experience beyond traditional enterprise IT. You will work across Linux, Kubernetes, networking, vulnerability management, security operations, and infrastructure hardening while partnering with specialists from networking, HPC, AI, and platform engineering teams. In return, you will be exposed to large-scale GPU infrastructure, modern AI workloads, and enterprise-grade security practices, while being mentored by experienced security professionals with deep expertise in securing mission-critical environments.

If you enjoy taking ownership, solving technical challenges, and building secure infrastructure at scale, we'd love to hear from you.

Key Responsibilities

• Secure and maintain Linux-centric enterprise infrastructure operating within an HPC environment.

• Manage the full vulnerability management lifecycle, including identification, assessment, remediation, verification, and reporting.

• Review threat intelligence reports and assess potential impact to the organization's environment.

• Review and analyse security alerts escalated by a managed SOC and coordinate appropriate remediation activities.

• Apply security patches and fixes across infrastructure platforms and document operational procedures for engineers and operators.

• Implement, review, and validate security hardening controls across:

  • Linux (particularly Ubuntu)
  • Windows Server
  • Kubernetes (K8s)

• Support penetration testing engagements, vulnerability assessments, and security audits.

• Collaborate with infrastructure, platform, and operations teams to continuously improve the organization's security posture.

• Develop and maintain security documentation, standards, and operational procedures.

Required Experience

• Minimum 5 years of professional experience, including at least 2 years in a Security Engineer or related cybersecurity role.

• Strong understanding of networking fundamentals, including:

  • Network segregation and segmentation concepts
  • Firewall policy management
  • Linux iptables

• Understanding of containerization and Kubernetes fundamentals, including:

  • Nodes
  • Pods
  • Containers

• Strong Linux system administration experience, particularly with Ubuntu.

• Experience securing and troubleshooting enterprise infrastructure.

• Strong analytical and problem-solving skills with a practical, hands-on approach to security.

Preferred Experience

• CISSP certification preferred.

• Experience working with:

  • Kubernetes (K8s)
  • Enterprise firewalls
  • Splunk or other SIEM platforms

• Experience with Windows administration and troubleshooting.

• Familiarity with infrastructure hardening, vulnerability management, and security operations.

• Experience supporting penetration testing and audit activities.

What You'll Get

• Exposure to administering and securing one of Hong Kong's largest GPU clusters supporting AI and HPC workloads.
• Mentorship from experienced security professionals with extensive expertise in enterprise infrastructure and cybersecurity.
• Opportunities to develop practical skills across Linux security, Kubernetes security, vulnerability management, threat analysis, and infrastructure hardening.
• Work alongside specialists from networking, HPC, AI, and platform engineering disciplines.
• Hands-on experience securing mission-critical infrastructure that powers next-generation AI and research computing platforms.
• A collaborative environment focused on technical excellence, continuous learning, and professional growth.

Why Join Us?

Unlike traditional security engineering roles that focus primarily on monitoring or compliance activities, this position provides direct exposure to securing large-scale GPU infrastructure, Linux platforms, and AI workloads in a highly specialized HPC environment. It's an opportunity to build deep technical expertise while working with cutting-edge technologies and experienced engineers across multiple domains.

Join us and help secure the infrastructure powering the next generation of AI and high-performance computing.