Senior IT Security Engineer in London

About the role

At Holland & Barrett, we’re over a century old - and still building like a startup. Our digital transformation has created a highly distributed IT estate, spanning corporate offices, hundreds of retail stores, manufacturing sites, and cloud environments. Securing that landscape at scale is critical - and that’s where you come in. This is a principal-level, hands-on security role with genuine scope. You’ll own the security architecture across our corporate IT environment, shaping how we protect networks, endpoints, email, and cloud platforms across a global business.

If you enjoy tackling real-world security challenges across diverse environments - from head office to shop floor to cloud - this role offers both complexity and impact.

The Role

As Principal IT Security Engineer, you’ll be the technical authority for IT security across Holland & Barrett. You’ll design and implement security controls end-to-end, working across network security, endpoint protection, email security, and Azure cloud security to deliver a cohesive, defense-in-depth strategy. This is a strategic yet hands-on role, partnering closely with IT operations, security leadership, and business teams to embed security into day-to-day operations.

What You’ll Do

• Architect and implement network security (firewalls, IDS/IPS, segmentation)
• Own email security controls including phishing protection, encryption, and DLP
• Design and deploy endpoint security across corporate, retail, and manufacturing devices
• Lead Azure security architecture covering identity, network, data, and compliance
• Define and enforce IT security policies and standards
• Drive vulnerability management and remediation across the estate
• Lead and support incident response for infrastructure-related security events
• Continuously evolve the security posture in line with emerging threats

Key requirements

• Experience operating at Principal or Senior IT Security Engineer level
• Deep hands-on expertise in network, endpoint, and email security
• Strong Azure security experience, including IAM and network controls
• Background securing distributed, multi-site environments
• Experience with SIEM, vulnerability management, and threat intelligence tooling
• Ability to translate security strategy into practical, scalable solutions
• Strong communication and stakeholder engagement skills

Why Holland & Barrett?

• Architect security at enterprise scale across a global retail organisation
• Broad, technically rich role with real ownership and influence
• Work alongside a security team that values hands-on expertise
• Flexible working and a supportive, purpose-led culture

What we offer

Wellbeing & Lifestyle Benefits

• Health Cash Plan
• Life Assurance
• Incentive Scheme – Based on company & personal performance
• Virtual GP
• Private Medical care
• FREE at-home blood test kit
• Holiday Purchase option
• Pension Contribution scheme
• Access to 'Wellhub' with gyms, studios and wellbeing apps

Discounts & Savings

• 25% Colleague Discount with FREE Standard Delivery
• Exclusive Discounts from a wide range of partners
• £/€50 Annual Product Allowance to spend in store

Learning & Development

• Access to a variety of learning opportunities, including Level 2-5 Apprenticeships, Workshops and our Digital Learning Library

Holland and Barrett is an equal opportunity employer. We welcome diverse perspectives and are committed to creating an inclusive environment for all colleagues. We understand that when our colleagues are listened to, respected and valued for who they are, we build an organisation with belonging at its heart - making health and wellness a way of life for everyone.