Lead Security Architect

Post Office Ltd; City Of London; Hybrid; GBP 110,000 - 140,000; Full time

Benefits offered by this job

27.5 days annual leave

Up to 18% on target bonus

Annual car allowance

Generous pension with 10% employer

24/7 digital GP and EAP

Life assurance and income protection

Access to 400+ online courses and undp

Job summary

Post Office Ltd is seeking a Lead Security Architect in London to drive the design and review of secure system architectures. You will align with technology principles, partner across functions, and help deliver a cohesive security strategy to mitigate threats and risks.

You will lead security initiatives, foster a culture of inclusion and high performance, and support transformation programs within a hybrid working environment. A strong track record in cybersecurity leadership is essential.

Qualifications

• Requires degree in computer science, information systems, cyber security, or related field or equivalent experience.
• Cyber security certifications such as GIAC, CISSP or cloud security certs desirable.

Responsibilities

• Design and review system architectures and align with POL's technology principles.
• Lead security initiatives and collaborate across teams to develop a cohesive security strategy.
• Support transformation programs and establish design principles to mitigate threats and risks.
• Drive a culture of inclusion, continuous improvement and high performance within teams.

Skills

Leadership

Influencing

Stakeholder management

Subject matter expert

Commercial acumen

Diversity & inclusion

Post Office values

Education

Degree in computer science / information security

Cyber security certifications (GIAC / CISSP) desirable

Job description

Summary

Salary: Competitive plus comprehensive benefits package

Grade: 3A

Reporting Line: Head of Enterprise Security Architecture

Contract Type: Permanent

Working pattern: Hybrid

Location: London

Closing Date: 10/09/2026

What to expect

The Lead Security Architect is a key member of the CISO team, responsible for the delivery of functional strategies, always modelling the Post Office behaviours and demonstrating a Postmaster first mindset.

The Lead Security Architect will design and review system architectures, align with POL's technology principles, and collaborate across functional areas to develop a cohesive security strategy. Support transformation initiatives, establish design principles, and regularly update security measures to mitigate emerging threats and risks. Ensuring POL's Security Architecture capability is effective and minimises risks of compromise and disruption.

They will drive a culture of inclusion, continuous improvement, and high performance across their teams, delivery and decision-making.

What we can do for you

Our business is changing and we understand that attracting the right talent is pivotal in driving the positive change needed, to help us achieve our ambitious goals. Beyond a competitive salary, we offer a comprehensive benefits package that includes:

• 27.5 days annual leave (rising to 30 after 2 years), plus bank holidays
• Up to 18% on target bonus opportunity
• Annual car allowance
• Generous pension scheme with minimum 10% employer contribution
• Access to 24/7 digital GP services and our Employee Assistance Programme
• 6 x Life assurance and income protection after 12 months service
• Over 400 online courses, mentoring, apprenticeships, and development programmes
• Access to our benefits platform for exclusive discounts & savings

What you'll need to succeed

To be successful in this role you will be well versed in the below:

Qualifications

• Degree in computer science, information systems, cyber security, or related field, or equivalent experience
• Cyber Security related certification such as GIAC, CISSP or cloud security certs desirable

Experience

• 5 to 10 years of professional experience in IT, with a focus on cybersecurity
• Technical leadership experience, demonstrating the ability to lead security initiatives and collaborate across teams
• Deep understanding of cybersecurity threats, technologies, and best practices
• Experience with modern digital architectures such as cloud, data, API, digital, and mobile
• Knowledge of security domains including endpoint, network, data, hybrid cloud security, and zero trust strategies
• Experience in leading threat modelling sessions.

Skills and Capabilities

• An enabler who can speak with knowledge and confidence in their subject matter, guiding their team to success.
• Excellent influencing and communication skills with the ability to utilise a range of techniques to deliver messages effectively, make an impact, and drive a successful outcome.
• Ability to develop and maintain strong relationships with senior stakeholders and leaders to build support for functional plans and activity.
• Acts as a expert advisor, applying advanced knowledge of their own specialism as well as broad knowledge of related areas.
• Strong commercial business acumen and ability to make data-driven business decisions.
• Demonstrates a strong commitment to upholding the values and principles of Post Office.
• A track record of actively promoting equality, diversity, and inclusion within all areas of responsibility and in particularly in the CISO function.

About us

At Post Office Ltd, we're proud to be at the heart of communities across the UK, upheld by the dedication and service of our postmasters. We offer essential services that people rely on every day, from parcels and banking to identity and government services. While we continue to evolve with digital innovation, our commitment to personal, face-to-face service remains core to who we are.

Our journey is one of reflection, growth, and meaningful change. We're looking for people who think differently. Those with resilience, purpose, and a deep sense of responsibility to our postmasters, partners and the communities they serve. If you're driven by the chance to make a real impact and help shape a future, built on progress and integrity, we'd love to hear from you. For more details visit [e-mail]

Application Guidance

Our commitment to embracing diversity extends beyond just words. While we've outlined key skills above, we recognise that great candidates come from a variety of backgrounds. We value diverse perspectives and are committed to building an inclusive workplace where everyone can thrive.

As a Disability Confident Employer, we recognise the value people with disabilities can bring to our business. If you require any reasonable adjustments throughout the recruitment process or would like further details on the job description, please contact [e-mail]