Senior Infrastructure & Cybersecurity Engineer (UK)

A Gas; Portishead; On-site; GBP 90,000 - 120,000; Full time

Benefits offered by this job

Employer pension scheme

Flexible working hours

Employee Assistance Program

Job summary

A‑Gas is seeking a Senior Infrastructure & Cybersecurity Engineer to design and evolve secure, resilient IT and OT infrastructure, maximizing business continuity and protection of critical assets.

You will work with MSPs, OT engineers and product owners to mitigate vulnerabilities and validate outcomes, ensuring manufacturing systems and legacy OS remain available and secure.

Qualifications

• 7+ years in infrastructure engineering with security focus.
• Experience with VMware virtualization and Microsoft stack.
• Designing redundant networks and business continuity.
• Familiarity with Meraki networking and firewall configuration.
• Knowledge of CIS18 controls, NIST CSF, and Zero Trust.
• Strong scripting/automation (PowerShell, Bash).

Responsibilities

• Design and evolve secure, resilient infrastructure and network architectures.
• Identify cyber vulnerabilities and implement mitigations with MSPs.

Skills

Infrastructure engineering

Security & resilience design

Scripting & automation

Tools

VMware

Microsoft stack

Azure AD

Defender

Sentinel

Meraki

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.

Job Description

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.