Lead Security Architect

Are you looking to leverage your expertise in OT network security architecture?

We have a great opportunity for you - Lead Security Architect (OT) Network!

Careers at TCS: It means more

TCS is a purpose-led transformation company, built on belief. We do not just help businesses to transform through technology. We support them in making a meaningful difference to the people and communities they serve - our clients include some of the biggest brands in the UK and worldwide. For you, it means more to make an impact that matters, through challenging projects which demand ambitious innovation and thought leadership.

• Shape the security architecture of critical OT networks across global operations.
• Influence strategic decisions with senior stakeholders and cross-functional teams.
• Lead risk-based security design that protects real-world infrastructure.

The Role

As a Lead Security Architect (OT) Network, you will define and implement network security architecture strategy, working closely with the Networks team, IT, and business stakeholders. You will align with the client’s Security Architecture team to ensure global consistency and strategic direction. Reporting to the Group Head of Security Architecture, you will bring extensive experience in engaging senior stakeholders and operating within global teams. Your focus will include network architecture, threat assessment, risk analysis, and the implementation of controls to manage residual risk across both programme and project level.

Key responsibilities:

• Lead the creation and execution of the global OT network security architecture strategy, ensuring alignment with business goals and risk posture.
• Collaborate with Security Architects, Business Architects and other stakeholders to design secure OT network solutions that support Zero Trust and segmentation models.
• Define secure zoning architectures and security controls for critical OT environments, including guidance on protecting assets between network zones.
• Contribute to the development and governance of network-related security policies, patterns, and standards.
• Support integration of OT network security within broader enterprise security frameworks and architecture.
• Assess risk, perform threat modelling, and drive decisions around secure network design and segmentation.
• Work closely with Network team to embed security into network design, decommissioning, and operational models.
• Define and support reusable network security blueprints for secure-by-design implementation.
• Engage with Procurement to support security requirements in vendor solutions.
• Monitor developments in OT network security and propose updates to improve scalability, resilience, and security posture.
• Contribute to network-related audits, assessments, and compliance reviews.
• Provide expert input into infrastructure and application-level network security assessments.
• Support secure solution design through collaboration across IT, engineering, and operations.

Your Profile

Essential skills/knowledge/experience:

• Proven experience in Network Security Architecture (or similar role) in a large-scale, high-criticality environment.
• Strong understanding of Enterprise Network Architecture across OT and IT domains.
• Ability to engage and influence stakeholders at all levels, with experience working in matrixed organisations and global teams.
• Proven ability to define and deliver complex security architectures aligned with business, risk, and compliance requirements.
• Clear understanding of zoning, segmentation, and secure connectivity models.
• Familiarity with frameworks such as NIST, ISO27001, SABSA, TOGAF, and relevant UK/EU regulations.
• Strong communication and presentation skills, with the ability to translate technical content for diverse audiences.
• Comfortable working under pressure and managing competing priorities with minimal oversight.
• Experience in threat modelling, risk assessment, and security control design.

Desirable skills/knowledge/experience:

• Certifications such as CISSP, CCSP, CCNP/CCNA, TOGAF, OR SABSA.
• Experience in regulated industries such as critical infrastructure, energy, or manufacturing.
• Exposure to cloud and hybrid networking models (e.g., SD-WAN, remote access, VPNs).
• Understanding of Zero Trust principles and their application in OT environments.
• Familiarity with architecture governance and assurance processes.
• Knowledge of tools and platforms for network monitoring, asset discovery, and policy enforcement.
• Experience working with suppliers or vendors on security-critical solutions.
• Ability to drive architectural decisions through influence, with a strategic and delivery-focused mindset.

Rewards & Benefits

TCS is consistently voted a Top Employer in the UK and globally. Our competitive salary packages feature pension, health care, life assurance, laptop, phone, access to extensive training resources and discounts within the larger Tata network.

We offer health & wellness initiatives and sports events; we are the proud sponsor of the London Marathon.

Diversity, Inclusion and Wellbeing

Tata Consultancy Services UK&I is committed to meeting the accessibility needs of all individuals in accordance with the UK Equality Act 2010 and the UK Human Rights Act 1998.

We welcome and embrace diversity in race, nationality, ethnicity, disability, neurodiversity, gender identity, age, physical ability, gender reassignment, sexual orientation. We are a disability inclusive employer and encourage disabled people to apply for this role.

As a Disability Confident Employer, we offer an interview to applicants with disabilities or long-term conditions who meet the minimum criteria for the role. Please email us at [email protected] if you would like to opt in.

If you are an applicant who needs any adjustments to the application process or interview, please contact us at [email protected] with the subject line: “Adjustment Request” or call TCS London Office 02031552100 / +44 204 520 2575 to request an adjustment. We welcome requests prior to you completing the application and at any stage of the recruitment process.

Next Steps:

Application Process

1. Online application: You can apply directly through LinkedIn/ by uploading your CV. In case you wish to submit your application via another format like audio/video, please, contact - [email protected]
2. Skill-Based discussion: This will be a level 1 interview with the project team, it can be via video or in-person. Details will be confirmed by your recruiter.
3. Managerial discussion: This discussion will focus on behavioural aspects and person-organisation fit.
4. HR Discussion: This will be with one of the members of the HR team and will cover your career journey, aspirations for growth, compensation and any other questions you may have.

Beware of Fraudulent offers

This is to notify you that TCS does not ask for any sort of payment or security deposit from candidates at any stage of the recruitment process. The firm never sends out job offers from free internet email services like Gmail, Yahoo Mail, and so on. TCS has not authorised any third-party company to collect money on their behalf. As a vigilant job seeker, beware of fraudulent recruitment activity and protect your interests! You can write to [email protected] to report any fraudulent activity.

Due to the high volume of applications, we will be unable to contact each applicant individually on the status of their application. If you have not received a direct response within 30 days, then it should be deemed unsuccessful on this occasion.

Join us and do more of what matters. Apply online now.