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Job #: R-00110371
Location: Mobile, GB
Category: Security Architecture and Engineering
Schedule (FT/PT): Full Time
Travel Required: Yes, 25% of the time
Shift: Day
Potential for Telework: Yes, 75%
Clearance Required: UK - SC HO


PRINCIPAL Cyber Security architect

Job Description

As a Principal Security Architect you will be able to work with minimal direction on a range of large and small programmes that deliver IT transformation and new services capabilities. You will ensure that the solution security design meets the customer functional and non-functional security requirements and provides the necessary assurance to our client, highly likely to be backed up by rigorous accreditation and certification processes, normally HMG standards (including MOD-specific JSP) alongside ISO27001.

You will have responsibility for interfacing to security design partners across programmes, both customer and supplier representatives, and colleagues within our engineering, service, and business development teams. You will ensure that Leidos can establish and maintain an effective and efficient security architecture for a programme, and that the designs will be able to adapt as customer requirements, legislation and accreditation standards change over a programme lifespan.

Within a programme, the role will primarily be responsible to a solution architect for developing and delivering the relevant elements of a solution, whilst understanding the whole. You will be required to work in both delivery and proposal environments.  You may be required to work on multiple programmes at the same time and these may include bids, implementation of new systems and transformation of existing systems.

You will have a complete understanding of cyber risk and treatment approaches.  Based on a strong ability to communicate risk and its proportionate management, you will know how this issue is addressed both in traditional ‘off-cloud’ highly sensitive platforms, and naturally in cloud technologies.  You will be experienced and accomplished in meeting the challenges associated with accrediting systems in public and private cloud environments. 

You will be required to develop high and low level security architecture designs for systems intended for secure/sensitive environments, with appropriate security based on detailed risk analysis. SABSA qualifications and experience would be desirable.

The Leidos client base includes a number of national government departments and arms-length bodies, local authorities and providers of critical national infrastructure.  We take our security obligations very seriously and will ensure there is a strong security component to all our proposals, and will be able to demonstrate a sound security operation is enabled by the solution we design for our clients.  You will be required to hold security clearance under National Security Vetting and Police processes.

You may need to work on customer locations or one of our secure development locations, or a mix of both, as well as an element of working from home.


British - Non-dual national – many of our projects have nationality restrictions.

SC cleared – Candidates should have or be willing to undergo SC, and if required, DV clearance.

Eligible for Non-personnel Police Vetting level 3 standard (NPPV3)


  • Experience of a taking a defence in depth and multi layered approach to security architecture

  • Experience of applying commensurate detective and protective security controls to reduce risk to an acceptable level

  • Understanding of the controlling processes for, and experience of a significant portion of, the systems engineering lifecycle (e.g. requirements management, configuration management)

  •  Understanding of different lifecycles/methodologies (waterfall, incremental, agile, DevOps)

  • Experience of the key engineering lifecycle reviews – e.g. System Requirements Review (SRR), Critical Design Review (CDR)

  • Experience in performing design trade off working with other architects and engineers to deliver an integrated and coherent solution

  • Understanding of service operations and security operational management planning

  • Experience working in both delivery and proposal environments

  • Experience of Defence Digital and relevant solutions and approaches across MOD


  • Excellent understanding of Confidentiality, Integrity and Availability (CIA) and practical experience in applying that

  • Experience in defining derived security requirements for a system, and managing traceability

  • Experience of gaining and maintaining accreditation for secure/sensitive systems

  • Experience in producing security documentation sets (such as SyOPS, RMADs, Security Management Plan, ISMS and DART submissions)

  • Understanding of the implementation, operation and maintenance of SIEM products

  • Understanding of network and boundary protection technologies (firewalls, mail gateways, load balancers, anti-virus)

  • Understanding of authentication and authorisation technologies (SAML, LDAP, PKI, etc)

  • Understanding of security infrastructure in Public and Private cloud, e.g. virtual network infrastructure, hybrid IaaS/PaaS/SaaS solutions

  • The ideal candidate will hold CISSP certification in addition to SABSA qualification

Communication and Soft Skills

  • Excellent verbal and written communication skills and works well in a team environment

  • Capable of developing and communicating a vision to meet the System Requirements

  • Ability to communicate complex technical ideas across a wide range of different audiences

  • A good level of commercial awareness that will support the bid and delivery environments

What do we do for you?

  • At Leidos we are PASSIONATE about customer success, UNITED as a team and INSPIRED to make a difference. We offer meaningful and engaging careers, a collaborative culture, and support for your career goals, all while nurturing a healthy work-life balance.

  • We provide an employment package that attracts, develops, and retains only the best in talent. Our reward scheme includes:

  • Contributory Pension Scheme

  • Private Medical Insurance

  • 33 days Annual Leave (including public and privilege holidays)

  • Access to Flexible benefits (including life assurance, health schemes, gym memberships, annual buy and sell holidays, and a cycle to work scheme)

  • Dynamic Working:

Commitment to Diversity:

We welcome applications from every part of the community and are committed to a truly diverse and inclusive culture.  We foster a sense of belonging, welcoming all perspectives and contributions, and providing equal access to opportunities and resources for everyone.

If you have a disability or need any reasonable adjustments during the application and selection stages, please let us know, and we will respond in a way that best fits your needs.

Who We Are:

Leidos UK & EUROPE – we work to make the world safer, healthier, and more efficient through technology, engineering, and science.

Leidos is a growing company delivering innovative technology and solutions focused on safeguarding critical capabilities and transformation in frontline services, our work in the United Kingdom includes addressing some of the most complex problems in defence, healthcare, government, safety and security, and transportation.

What Makes Us Different:

Purpose: you can use your passion and abilities at Leidos to keep the people you care about safe. We are at the forefront of machine learning, AI, cyber security, and solutions. Using your skills in the technology frontline by helping to build a safer world.  You can inspire change.

Collaboration: having flexibility to do your job is one of our core benefits, enabling you to become part of our extraordinary team.  We have been empowering our people to work flexibly for years.  Whether you work from home, the office or on customer sites, we will give you the digital tools and the flexibility to work smarter and align your needs and ours.    


People: Leidos empowers people from every background to be themselves and gives you the tools to learn new skills by enabling growth whilst developing. We believe that extraordinary people need opportunities to grow, to be inspired and to inspire others. At Leidos, we invest in technical academies, career rotations and a career development plan that enhance your future.

Pay Range:

The Leidos pay range for this job level is a general guideline only and not a guarantee of compensation or salary. Additional factors considered in extending an offer include (but are not limited to) responsibilities of the job, education, experience, knowledge, skills, and abilities, as well as internal equity, alignment with market data, applicable bargaining agreement (if any), or other law.


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