Senior Manager, Security Architect, Cyber, Defence & Security (Government and Public Sector)

Deloitte (UK); California; Hybrid; USD 120,000 - 160,000; Full time

Job summary

Deloitte is seeking a Security Architect to design technical security solutions, lead engagements, and align architecture with client policy frameworks for Defence and Security projects in the UK. You will collaborate with Identity, Security Testing and Privacy SMEs to solve complex business problems.

As a senior member, you will build strong stakeholder relationships, stay current with security threats and industry best practices, and drive secure design across projects.

Qualifications

• Information Security qualification or equivalent (e.g., CISSP).
• Knowledge of security frameworks and standards (ISO 27001, NIST, CIS).
• Experience as a Security Architect or similar role leading technical teams.

Responsibilities

• Understand clients’ policies and security landscapes and craft architecture solutions.
• Articulate design decisions to non-technical stakeholders.
• Maintain relationships with senior technical stakeholders.
• Collaborate with vendors to ensure security of external systems.
• Provide specialist technical advice and suggested security controls.
• Develop and maintain security architectures aligned with business goals.

Skills

InfoSec qualification

Security frameworks

Security architecture

TOGAF/SABSA

Threat modelling

Cloud security

DevSecOps

CI/CD

Government security

Vendor collaboration

Education

Information Security qualification (CISSP)

Tools

Firewalls

SIEM

Vulnerability scanners

AWS/Azure/GCP

Job description

Bristol, Edinburgh, Glasgow, London, Manchester

Business Line

Job Type

Permanent / FTC

Date published

12-Oct-2026

Connect to your Industry

Do you want to be at the heart of some of the biggest and most ambitious programmes undertaken to keep our country safe?

We are proud of the impact we have with Defence and Security clients, the strength of our relationships, and the variety of our skills and expertise that we bring to help them achieve their mission.

We’re growing our teams across all of Technology and Transformation. If you are cleared to SC or DV level, or willing and eligible to obtain this, and want to grow your career in this sector, we are very keen to hear from you.

Connect to your career at Deloitte

Deloitte drives progress. Using our vast range of expertise, we help our clients' become leaders wherever they choose to compete. To do this, we invest in outstanding people. We build teams of future thinkers, with diverse talents and backgrounds, and empower them all to reach for and achieve more.

What brings us all together at Deloitte?It’show we approach the thousands of decisions we make everyday. How we behave, our beliefs and our attitudes. In other words: our values. Whatever we do, whereverwe arein the world, welead the way,serve with integrity, take care of each other ,fosterinclusion, andcollaborate for measurable impact. These five shared values lead every decisionwemake and action we take, guiding us to deliver impact how and where it mattersmost .

Connect to your opportunity

A Security Architect operates as a senior member of the team, responsible for the design of technical security solutions, maintaining documentation and developing architecture patterns and approaches for new technologies and solutions.

The Security Architect will lead the technical engagement and bring together technical security SMEs such as Identity, Security Testing and Privacy to solve the business problem.

As a senior member of the technical team, security architects must develop relationships with key stakeholders, understand a client's security policy framework, and design solutions that will meet our client requirements.

Our projects vary greatly and your responsibility as a security architect will differ based on the focus of the client engagement and your skillset, but could include and may require you to:

• Understand clients’ policies and security landscapes and create vision, principles and architecture solutions
• Articulate, communicate, and justify design decisions to non-technical stakeholders
• Maintain relationships with senior technical stakeholders
• Learn new technical solutions from vendors and articulate how they solve client problems by providing the technical design to be adopted (Architecture Patterns)
• Collaborate with vendors and third-party partners to ensure the security of external systems and data exchanges.
• Provide specialist technical advice, recommended approaches, recommended security controls, & identify solutions that meet client business objectives.
• Develop and maintain security architectures, ensuring alignment with business goals, industry standards, established patterns and regulatory requirements.
• Stay up to date with emerging security threats, technologies, and industry best practices, and provide recommendations for improvement.
• Conduct security audits and assessments to identify gaps and recommend remediation actions.
• Conduct risk assessments and scoping vulnerability assessments to identify potential security threats and vulnerabilities.

Connect to your skills and professional experience

All applicants must be willing and eligible to apply for and obtain UK security clearance to Security Check (SC) or Developed Vetting (DV) level, if not holding an existing clearance.

Candidates will be able demonstrate relevant knowledge & experience through a combination of qualifications and evidence of work history such as:

• Information Security qualification (or equivalent) e.g. CISSP.
• In-depth knowledge of security frameworks, standards, and best practices (e.g., ISO 27001, NIST, CIS).
• Experience as a Security Architect or in a similar role, with a strong track record of designing and implementing security controls and/or solutions and leading technical teams.
• Experience with architecture methodology such as TOGAF or SABSA
• Experience of threat and risk modelling
• Strong understanding of network security, encryption, authentication, and access control mechanisms.
• Experience with security technologies such as firewalls, intrusion detection/prevention systems, security information and event management (SIEM) systems, and vulnerability assessment tools, and their configuration options.
• Familiarity with cloud security principles and best practices, including securing cloud-based infrastructure and services (AWS, Azure or Google)
• Experience of DevSecOps
• Experience researching technology trends and ways to secure those technologies.
• Experience with automated deployment techniques and CI/CD pipelines.
• Experience working in or with Government organisations, including the handling of assets subject to the Government Security Classification Policy.
• Knowledge of Government cyber requirements related to Defence and Security e.g. Secure by Design, JSP 440

Connect to your business - Technology and Transformation

Distinctive thinking, deep expertise, innovation and collaborative working. That’s what connects us. That’s what makes us Deloitte. If you want to help solve some of the biggest tech and transformational challenges around, join us. Together, we’ll make an impact that matters.

Cyber

The modern world is more complex than ever before, and we are navigating an ever-changing landscape. We help clients to operate with resilience and grow with confidence to secure success and minimise risk.

Personal independence

Regulation and controls are standard practice in our industry and Deloitte is no exception. These controls provide important legal protection for both you and the firm. We are subject to a number of audit regulations, one of which requires that certain colleagues abide by specific personal independence constraints (e.g., in relation to any financial interests and employment relationships). This can mean that you and your "Immediate Family Members" are not permitted to hold certain financial interests (shares, funds, bonds etc.) with audit clients of the firm, and also prohibitions on certain employment relationships (e.g., you are not permitted to hold a secondary employment role with SEC audit clients of the firm whilst being employed by the firm). The recruitment team will provide further detail as you progress through the recruitment process or you can contact the Independence team upon request.

Connect with your colleagues

“The opportunities to make a difference here are huge. We’re constantly encouraged to come up with ideas, so a lot of what we do to drive change comes from within our own workforce. - Gurpal, T&T

Our hybrid working policy

You’ll be based in one of our UK offices with hybrid working.

At Deloitte we understand the importance of balancing your career alongside your home life. That’s why we’ll support you to work flexibly through our hybrid working policy. Depending on the requirements of your role, you’ll have the opportunity to work in your local office, virtual collaboration spaces, client sites and remotely. You’ll get the chance to meet face to face when needed, while you collaborate and learn from colleagues, share your experiences, and build the relationships that will fuel your career and prioritise your wellbeing. Please check with your recruiter for the specific working requirements that may apply for your role.

Our commitment to you

Making an impact is more than just what we do: it’s why we’re here. So we work hard to create an environment where you can experience a purpose you believe in, the freedom to be you, and the capacity to go further than ever before.

We want you. The true you. Your own strengths, perspective and personality. So we’re nurturing a culture where everyone belongs, feels supported and heard, and is empowered to make a valuable, personal contribution. You can be sure we’ll take your wellbeing seriously, too. Because it’s only when you’re comfortable and at your best that you can make the kind of impact you, and we, live for.

Your expertise is our capability, so we’ll make sure it never stops growing. Whether it’s from the complex work you do, or the people you collaborate with, you’ll learn every day. Through world-class development, you’ll gain invaluable technical and personal skills. Whatever your level, you’ll learn how to lead.

Connect to your next step

A career at Deloitte is an opportunity to develop in any direction you choose. Join us and you’ll experience a purpose you can believe in and an impact you can see. You’ll be free to bring your true self to work every day. And you’ll never stop growing, whatever your level.

Discover more reasons to connect with us, our people and purpose-driven culture at deloitte.co.uk/careers