Security Engineer

Era4 develops, owns and operates AI infrastructure across the UK, powered by renewable energy. Converting legacy industrial and energy sites into modern data-centre facilities, Era4 is combining brownfield regeneration opportunities with cleaner, efficient, scalable compute capacity for healthcare, research, finance, enterprise, and public-sector organisations.

We are seeking a Security Engineer to design, implement, and continuously improve security controls across our next-generation AI infrastructure and data centre operations. This role focuses on protecting Kubernetes-based and cloud-native environments, securing our data centre networking and infrastructure stack, strengthening security posture, identifying and mitigating risks, and enabling secure software delivery practices.

You will work closely with engineering, platform, and operations teams to integrate security into Era4's proprietary cloud infrastructure, data centre networks, CI/CD pipelines, containerized workloads, GPU-accelerated compute, and AI/ML platforms. The successful candidate will combine hands‑on technical expertise with a proactive approach to threat detection, vulnerability management, and security automation across our brownfield‑to‑modern bare metal and cloud infrastructure environments.

• Design, implement, and maintain security standard and controls for on prem Kubernetes.
• Review infrastructure architectures and perform security assessments to identify risks and recommend mitigations.

• Integrate security controls into CI/CD pipelines, including SAST, DAST, dependency scanning, container image scanning, and secrets detection.
• Partner with development teams to implement secure coding practices and remediate security findings.
• Conduct threat modelling and security reviews for new applications, services, and infrastructure changes.

• Lead vulnerability identification, prioritisation, remediation, and reporting activities across infrastructure and applications.

• Develop and maintain security monitoring, alerting, detection capabilities and incident response playbooks.
• Investigate security incidents, perform root cause analysis, and coordinate remediation activities.

• Build automation to improve security monitoring, compliance validation, vulnerability management, and incident response workflows.
• Leverage Infrastructure as Code and policy-as-code frameworks to enforce security standards at scale.

• Experience in Security Engineering, Cloud Security, Dev Sec Ops , Infrastructure Security, or Data centre Security.
• Hands‑on experience with vulnerability management platforms and security assessment methodologies.
• Familiarity with CI/CD security controls, secure software development practices, and supply chain security.
• In‑depth scripting and automation skills using Python, Bash, or similar languages.

• Experience securing AI/ML or GPU‑based infrastructure, data centre network security, firewalls, and network segmentation (Palo Alto firewalls, Opn Sense, Nokia networking, or similar).
• Familiarity with compliance frameworks such as SOC 2, ISO 27001, NIST CSF, CIS Benchmarks, or PCI DSS.
• Experience with threat modelling, penetration testing, or red team engagements.
• Security certifications such as CISSP, GSEC, GCIH, GCIA, CCSK, CCSP, or relevant cloud security certifications.

You’llbe joining a mission‑driven start‑up building critical national infrastructure, where operational excellence directly enables growth. This role offers high visibility with leadership, real autonomy, and the chance to shape how a next‑generation companyoperatesat scale.

Era4 is an equal opportunity employer. We celebrate diversity and are committed to creating an inclusive environment for all employees.

United Kingdom: (Occasional office visit required)