Senior Information Security Manager London

Mesh-AI Limited; City of London; Hybrid; GBP 80,000 - 100,000; Full time

Job summary

A leading AI infrastructure provider in London seeks a Senior Information Security Manager to oversee the security framework across technical and physical domains. Candidates should have extensive experience in security management and ISO compliance. The role involves managing audits, incident responses, and maintaining security protocols in a dynamic environment. This position offers a competitive package and a flexible, remote-first work culture.

Benefits

Highly competitive package (base + equity)

Dynamic progression plan

Human-First Flexibility

Thriving remote-first team

Qualifications

• Hands-on experience with GPU/HPC or cloud infrastructure security.
• Knowledge of Kubernetes and container security.
• Experience leading audits and assessments.

Responsibilities

• Support ongoing delivery of ISO frameworks.
• Maintain the Information Security Management System (ISMS).
• Oversee vulnerability management and incident workflows.

Skills

5+ years in information or physical security management

Deep familiarity with ISO 27001

Strong understanding of incident response

Excellent documentation and communication skills

Hands-on with GRC tooling

Education

Security certifications (CISSP, CISM, ISO 27001 LA/LI)

Tools

Darktrace

Tenable

Exabeam SIEM

Job description

Senior Information Security Manager, London

About Nscale

Nscale is the GPU cloud engineered for AI. We provide cost-effective, high-performance infrastructure for AI start-ups and large enterprise customers. Nscale enables AI-focused companies to achieve superior results by reducing the complexity of AI development. Our GPU cloud bolsters technical capabilities and directly supports strategic business outcomes, including cost management, rapid innovation, and environmental responsibility.

We thrive on a culture of relentless innovation, ownership, and accountability, where every team member takes pride in their work and drives it with excellence and urgency. As an Nscaler, you’ll build trust through openness and transparency, where everyone is inspired to do their best work. If you join our team, you’ll be contributing to building the technology that powers the future.

Role Overview

We are seeking a Senior Information Security Manager to work closely with the Head of Information Security in building and managing Nscale’s end-to-end security framework cross physical, technical, and organisational domains.
You’ll be hands-on, execution-focused, and comfortable working in a complex environment that spans hyperscale GPU clusters, critical infrastructure, and compliance programmes (SOC 2 Type II, ISO 27001/17/18, Cyber Essentials Plus, ISO 22301, and ISO 22237).This role will directly support ongoing certification, audit readiness, and incident response initiatives, while driving operational maturity across all Nscale sites and systems.

This role requiresUK government security clearance up to DV

What you'll do

• Support ongoing delivery of ISO 27001, ISO 27017/27018, SOC 2 Type II, Cyber Essentials Plus, and ISO 22301 frameworks.
• Maintain the Information Security Management System (ISMS), risk register, and control evidence for internal and external audits.
• Support third-party risk management (TPRM) ensuring supplier compliance and onboarding reviews.
• Develop and track KPIs/KRIs for security operations and compliance health.

Operational Security

• Oversee vulnerability management, EDR posture, and security incident workflows in partnership with or MSSPs.
• Support incident detection, triage, investigation, and root-cause analysis.
• Own operational runbooks for containment, eradication, and recovery procedures.
• Review access control lists, privileged-user logs, and infrastructure security baselines.
• Maintain asset inventory, patch cadence, and configuration compliance (servers, workstations, and Kubernetes workloads).

Physical & Data Centre Security

• Support the physical security programme at all Nscale data centres, ensuring alignment with ISO 27001 Annex A.11 and ISO 22237.
• Maintain visitor management and access audit trails, assisting with incident reviews and compliance documentation.

Awareness & Culture

• Support security awareness and phishing simulation programmes .
• Develop clear communications and training materials to reinforce security accountability across teams.
• Contribute to architecture reviews, change-control boards, and project assessments.
• Identify and implement automation opportunities to reduce manual compliance and reporting overhead.
• Track and report on control effectiveness, audit findings, and remediation progress to senior leadership.

About you

• 5+ years in information or physical security management within a data centre, cloud, or MSP environment.
• Deep familiarity with ISO 27001, SOC 2, NIST CSF, and Cyber Essentials Plus frameworks.
• Experience leading or supporting audits and external assessments.
• Strong understanding of incident response, vulnerability management, and access control processes.
• Excellent documentation, communication, and stakeholder management skills.
• Hands-on with GRC tooling.
• Experience with GPU/HPC or cloud infrastructure security.
• Familiarity with ISO 22237 (data-centre design & operations).
• Knowledge of Kubernetes, container security, and hybrid cloud architectures.
• Familiarity with Darktrace, Tenable, Checkpoint Harmony, and Exabeam SIEM.
• Security certifications (CISSP, CISM, ISO 27001 LA/LI, CompTIA Sec+, or similar).

What we can offer you

At Nscale, you'll find a collaborative, supportive, and innovative environment where your contributions spark real impact. We're building something extraordinary, and we want you at the core.

• Highly competitive package (base + equity) with reviews every 12 months. 🚀
• Join the fastest-growing tech startup, your chance to push boundaries, collaborate with brilliant minds, and make your mark on cutting-edge AI. ✨
• Expect a dynamic progression plan tailored to your ambitions. Grow by trying new things, leading, challenging the status quo, and owning your impact, always with our full support.
• Human-First Flexibility: We treat you as humans first. 🫶🏽 Our flexible workplace trusts Nscalers to deliver, giving you the autonomy to shape your day around life's moments.
• Join our thriving remote-first team. Geography is no barrier to impact or connection. We build seamless virtual collaboration, empowering you, wherever you work.

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