Senior Infrastructure Security Engineer
agas in americasRhome (TX)
About the role
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.
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 (Power Shell, Bash) and ability to validate MSP deliverables. Desirable Experience with PAM solutions (Cyber Ark 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.
Before you apply
Applying takes about a minute. These four things decide how fast it moves after that.
Your profile is current
It's what we read first. Occupations, seniority and locations matter more than a long history.
Two examples you can talk through
Not a portfolio — just two pieces of work where you can explain the decisions and what you'd change.
A number in mind
What you're on now and what would make you move. We negotiate better when we know both.
Your notice period
Employers plan around it, and it's the question that stalls offers most often.
Once you apply, someone reads it and calls you before anything reaches the employer — usually within two working days.
More like this