Senior Security Architect & Platform Lead

Man Group; Greater London; Hybrid; GBP 130,000 - 170,000; Full time

Benefits offered by this job

Flexible working arrangements

Volunteer days

Job summary

Man Group in London is seeking a senior security architect to own end-to-end security architecture across internal applications and platforms. You will set the target architecture, drive Zero Trust policies, and publish secure reference designs while mentoring engineers and collaborating with IAM, Infosec, and AI security teams.

You will develop platform APIs for applications, AI agents, and users, and balance risk with delivery speed.

Qualifications

• Significant experience in security engineering or architecture, including end-to-end ownership of security architecture for production platforms.
• Strong Python skills; comfortable with Bash, SQL and log query languages.
• Infrastructure-as-code and GitOps (Terraform, Ansible, Helm).
• Deep understanding of authentication, authorisation and secrets management (OIDC/OAuth, Azure AD/Entra ID, vault, Keycloak) and of access control models.
• Security of AI agents and LLM applications (delegated access, tool-use authorisation, prompt injection).
• Hands-on experience with Kubernetes, Linux and containerised environments, including network policies.
• Strong grasp of network security controls: firewalls, WAFs, segmentation, TLS termination and egress filtering.
• A structured approach to threat modelling and risk assessment, and the ability to explain risk clearly to any audience.
• Experience in financial services or another regulated environment.

Responsibilities

• Define and own the target security architecture (components, services and APIs) for internal applications and platforms, covering identity, authorisation and secrets.
• Set the Zero Trust roadmap: user and machine identity, just-in-time and least-privilege access, and policy enforcement at the point of use.
• Make and record architectural decisions, balancing risk, delivery speed and operating cost.
• Publish reference designs and paved-path patterns so that the default for teams is also the secure one.
• Lead the design of the security policy engine for scoped time-bound system and data access.
• Design and build the platform APIs that applications, AI agents and users call.
• Mentor engineers and lead design reviews.
• Work with IAM, Infosec, Security Operations and Infrastructure teams so that controls can be monitored, detected and audited.
• Working with Developer, Infrastructure and AI platform teams to ensure solutions balance the security and agility requirements of Man.
• Explain risk clearly to engineers, senior leadership and non-technical stakeholders, and support audit and regulatory work.

Skills

Security architecture

Python

Bash

SQL

Terraform

Ansible

Helm

OIDC/OAuth

Azure AD/Entra ID

Vault

Keycloak

AI security for LLMs

Kubernetes

Linux

Network security

Threat modelling

Financial services experience

Tools

Kubernetes

Terraform

Ansible

Helm

Vault

Keycloak

Azure AD/Entra ID

Job description

Man Group in London is seeking a senior security architect to own end-to-end security architecture across internal applications and platforms. You will set the target architecture, drive Zero Trust policies, and publish secure reference designs while mentoring engineers and collaborating with IAM, Infosec, and AI security teams.

You will develop platform APIs for applications, AI agents, and users, and balance risk with delivery speed.