Senior Infrastructure Security Engineer

A-Gas Americas; Rhome (TX); On-site; USD 130,000 - 170,000; Full time

Job summary

A-Gas Americas is seeking a Senior Infrastructure & Cybersecurity Engineer to design and evolve secure, resilient IT/OT infrastructure and networks, focusing on business continuity and eliminating single points of failure.

You will partner with MSPs, OT engineers, and product owners to keep manufacturing systems and critical assets available and protected, applying CIS controls, Zero Trust, and modern security practices.

Qualifications

• 7+ years in infrastructure engineering with security focus.
• Expertise in VMware virtualization and Microsoft stack (Entra ID/Azure AD, Windows Server, Intune, M365, Defender, Sentinel).
• Proven experience designing redundant network architectures and 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 validating MSP deliverables.

Responsibilities

• Design and evolve secure, resilient IT/OT infrastructure and network architectures to maximize business continuity.
• Identify mitigations for cyber vulnerabilities and oversee MSP remediation and validation.
• Collaborate with OT engineers and Product Owners to keep manufacturing systems and critical assets secure and available.

Skills

VMware virtualization

Microsoft stack

Network security design

PowerShell

Bash

Zero Trust

NIST CSF

PAM

Job description

Senior Infrastructure Security Engineer

Why A‑Gas?

At A‑Gas, what we do matters - every single day. We are a global leader in Lifecycle Refrigerant Management. We help industries reduce emissions, protect the environment, and transition to a more sustainable future.

Our goal is clear: to protect and improve the environment by effectively managing refrigerants throughout their entire lifecycle.

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

Why choose A‑Gas?

Because your work contributes to something bigger:

• A safer climate
• A more sustainable industry
• An organization with a clear mission, innovative strength, and long‑term vision

Together, we are building a sustainable future.

We are an equal opportunity employer. All qualified applicants will receive consideration for employment without regard to race, color, religion, sex, sexual orientation, national origin, disability, or veteran status.