Senior Infrastructure Security Engineer

A-Gas Americas$120K — $145K *
Information Technology
5 - 7 years of experience
Job Overview by Ladders

Qualifications

  • 7+ years in infrastructure engineering with a focus on security and resilience design.
  • Expertise in VMware virtualization and Microsoft technologies (Entra ID/Azure AD, Windows Server, Intune, M365, Defender, Sentinel).
  • Experience in designing redundant network architectures and implementing business continuity strategies.
  • Familiar with Meraki networking and firewall configuration for secure cross-business connectivity.
  • Knowledge of CIS18 controls, NIST CSF, and Zero Trust principles.
  • Strong scripting/automation skills in PowerShell and Bash, with the ability to validate MSP deliverables.

Responsibilities

  • Support the Head of Infrastructure in designing secure and resilient architectures.
  • Maximize business continuity by eliminating single points of failure.
  • Identify and design mitigations for cyber vulnerabilities.
  • Work closely with Managed Service Providers (MSPs) to execute remediation efforts.
  • Collaborate with OT engineers and Product Owners to secure and maintain critical systems.
  • Validate outcomes of remediation efforts alongside MSPs.

Benefits

  • Competitive and attractive employment package
  • Employer pension scheme
  • Flexible working hours (role-dependent)
  • Collective benefits program
  • Employee Assistance Program (support for work and personal matters)
  • Cycle to work scheme
  • Team-building activities during summer and Christmas.
Full Job Description
Senior Infrastructure Security Engineer

Job Purpose

A-Gas is strengthening its global infrastructure and cyber resilience across IT and OT environments. We are seeking a Senior Infrastructure & Cybersecurity Engineer who will support the Head of Infrastructure in designing and evolving secure, resilient infrastructure and network architectures. This role focuses on maximizing business continuity, eliminating single points of failure, and protecting critical assets.

The position holder will identify and design mitigations for cyber vulnerabilities, working closely with Managed Service Providers (MSPs) to execute remediation and validate outcomes. They will collaborate with OT engineers and Product Owners to ensure manufacturing systems, legacy operating systems, and critical business products remain available and secure.

Essential Experience
  • 7+ years in infrastructure engineering, with strong exposure to security and resilience design.
  • Expertise in VMware virtualization, Microsoft stack (Entra ID/Azure AD, Windows Server, Intune, M365, Defender, Sentinel).
  • Proven experience designing redundant network architectures and implementing business continuity strategies.
  • Familiarity with Meraki networking and firewall configuration for secure cross-business connectivity.
  • Knowledge of CIS18 controls, NIST CSF, and Zero Trust principles.
  • Strong scripting/automation skills (PowerShell, Bash) and ability to validate MSP deliverables.


Desirable
  • Experience with PAM solutions (CyberArk or similar), SIEM/SOAR tuning, WAF, IDS/IPS.
  • Exposure to industrial control systems (ICS) and OT security best practices.


Certifications
  • AZ-500 (Azure Security Engineer), SC-100 (Cybersecurity Architect), CISSP, or equivalent.


What do you get in return?
  • Competitive and attractive employment package
  • Employer pension scheme
  • Flexible working hours (depending on the role)
  • Collective benefits program
  • Employee Assistance Program (support for work and personal matters)
  • Cycle to work scheme
  • Team activities in summer and around Christmas

Together, we are building a sustainable future.

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