Greenfield Security Engineer: Build Security from Scratch

Referment; Greater London; On-site; GBP 90,000 - 130,000; Full time

Job summary

Referment is assembling a security function from the ground up with a greenfield opportunity to shape architecture, tooling, and processes. You will work with a highly technical team and senior leadership to design and implement a scalable, engineering-led security programme.

You’ll lead protection across cloud, infrastructure, and applications, while embedding security early in the development lifecycle and setting long-term architectural standards for the evolving platform.

Qualifications

• Experience in Security Engineering or Blue Team, threat detection, incident response.
• Experience securing cloud-native environments.
• Strong knowledge of IAM, authentication, authorisation, and PKI.

Responsibilities

• Design, build, and own detection and response capabilities, including alerting, threat detection, canaries, honeypots, and incident response workflows.
• Implement security controls across cloud, infrastructure, and application environments.
• Develop and enhance authentication, authorisation, identity, and certificate management frameworks.
• Partner closely with software and infrastructure engineers to embed security throughout the development lifecycle.
• Define the long-term security architecture, standards, and strategy as the platform evolves.

Skills

Security engineering

Threat detection

Cloud security

Identity security

Incident response

Security automation

Tools

IAM tools

PKI

Cloud platforms

Job description

Referment is assembling a security function from the ground up with a greenfield opportunity to shape architecture, tooling, and processes. You will work with a highly technical team and senior leadership to design and implement a scalable, engineering-led security programme.

You’ll lead protection across cloud, infrastructure, and applications, while embedding security early in the development lifecycle and setting long-term architectural standards for the evolving platform.