Senior Security Architect & Platform Lead

Man Group; City Of London; On-site; GBP 140,000 - 190,000; Full time

Benefits offered by this job

Flexible working arrangements

Two annual Mankind days

Private medical coverage

Pension plan

Job summary

Man Group, headquartered in London, seeks a senior Security Architect to own end-to-end security architecture for internal platforms and AI-enabled applications. You will define components, services, and APIs, lead Zero Trust initiatives, and document architecture decisions with a focus on secure, scalable design.

You will mentor engineers, drive security policy and platform API design, and collaborate with IAM, Infosec and infrastructure teams to ensure auditable controls.

Qualifications

• Significant experience in security engineering or architecture with end-to-end ownership of security for production platforms.
• Strong Python skills; Bash, SQL and log query languages stack experience.
• IaC and GitOps practices (Terraform, Ansible, Helm).
• Deep understanding of authentication/authorization and secrets management (OIDC/OAuth, Azure AD/Entra ID, vault, Keycloak).
• Security of AI agents and LLM applications (delegated access, tool-use authorization, prompt injection).
• Hands-on Kubernetes, Linux and containerised environments with network policies.
• Strong knowledge of network security controls (firewalls, WAFs, TLS, egress).
• Threat modelling and risk assessment with clear risk communication.

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.
• Collaborate with Developer, Infrastructure and AI platform teams to balance security and agility.
• Explain risk clearly to engineers, senior leadership and non-technical stakeholders, and support audit/regulatory work.

Skills

Security architecture

Python

Bash

SQL

Terraform

Ansible

Helm

OIDC/OAuth

Azure AD

Keycloak

AI/LLM security

Kubernetes

Linux

Network security

Threat modelling

Risk assessment

Regulated environment

Tools

GitOps

Terraform

Ansible

Helm

Job description

Man Group, headquartered in London, seeks a senior Security Architect to own end-to-end security architecture for internal platforms and AI-enabled applications. You will define components, services, and APIs, lead Zero Trust initiatives, and document architecture decisions with a focus on secure, scalable design.

You will mentor engineers, drive security policy and platform API design, and collaborate with IAM, Infosec and infrastructure teams to ensure auditable controls.