Senior Infrastructure & Cybersecurity Engineer (USA)

A-Gas; Rhome (TX); On-site; USD 140,000 - 190,000; Full time

Benefits offered by this job

Pension scheme

Flexible hours

Cycle to work

Job summary

A-Gas is seeking a Senior Infrastructure & Cybersecurity Engineer to reinforce its global infrastructure and cyber resilience. You will help design secure, resilient architectures across IT/OT, ensuring continuity and protection of critical assets.

You will partner with MSPs and OT teams to identify vulnerabilities, implement mitigations, and validate outcomes, keeping manufacturing and enterprise systems available and secure.

Qualifications

• 7+ years in infrastructure engineering with security/resilience design.
• Expertise in VMware virtualization and Microsoft stack (Entra ID/Azure AD, Windows Server, Intune, M365).
• Experience designing redundant network architectures and business continuity strategies.

Responsibilities

• Design and evolve secure, resilient infrastructure and network architectures.
• Identify and mitigate cyber vulnerabilities; collaborate with MSPs for remediation.
• Ensure manufacturing systems, legacy OS, and critical business products remain available and secure.

Skills

Infrastructure design

VMware virtualization

Microsoft stack

Network resiliency

Meraki networking

CIS controls

Scripting PowerShell

Azure AD/Entra ID

Tools

Defender

Sentinel

Job description

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.