Lead Security Architect ( Networks)

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Role: Lead Security Architect ( Networks)

Job Type: Permanent

Location: Leamington / Gaydon

Mode of Working: Office based.

Ready to define and drive the future of secure network architecture across enterprise and operational technology environments?

We have an exciting opportunity for you – Lead Security Architect - Networks!

Careers at TCS: It Means More

TCS is a purpose‑led transformation company, built on belief. We do not just help businesses 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.

• Design and govern security solutions that directly strengthen Cyber Operations across a complex enterprise environment.

• Work at the intersection of operational security, enterprise architecture, and customer governance.

• Influence strategic security direction while ensuring solutions remain resilient, scalable, and compliant.

The Role

As a Lead Security Architect - Networks, you will define, govern, and drive the network security architecture strategy across Operational Technology (OT) environments. Working closely with Network Engineering, Enterprise Architecture, Cyber Security, and business stakeholders, you will ensure network solutions are secure by design, resilient, scalable, and aligned with organisational and regulatory requirements. You will play a key role in shaping the future network security landscape while supporting digital transformation journey.

Key Responsibilities:

Security Architecture & Strategy:

• Define and execute the network security architecture strategy and roadmap in alignment with organisational cyber security objectives.
• Lead the design and adoption of secure network architectures across enterprise, cloud, hybrid, and Operational Technology environments.
• Develop and maintain network security blueprints, standards, patterns, and reference architectures.
• Ensure architecture designs meet security, resilience, scalability, performance, and operational requirements.
• Drive the adoption of Zero Trust principles through network segmentation, security zoning, and modern access control models.

Architecture Governance & Risk Management:

• Conduct threat modelling, risk assessments, and security reviews for network services and strategic transformation programmes.
• Establish governance frameworks, security policies, standards, and operating models for current and future network environments.
• Ensure security requirements are embedded within enterprise architecture and solution design processes.
• Support audit, compliance, and risk management activities across network infrastructure and security initiatives.
• Maintain alignment with industry standards, security frameworks, and regulatory requirements.

Network Security Design & Technical Leadership:

• Provide architectural leadership across network security technologies, including:
• Firewalls, VPNs, Network Access Control (NAC)
• Intrusion Detection and Prevention Systems (IDS/IPS)
• Data Loss Prevention (DLP)
• SIEM Platforms
• Wireless Security Solutions
• Cloud Networking Technologies
• Collaborate with Network Architects and Engineering teams to embed security controls into existing and future network designs.
• Evaluate emerging technologies, industry trends, and security innovations to strengthen the organisation's security posture.
• Support procurement and vendor assessments by evaluating security capabilities and associated risks.

Operational Alignment & Leadership:

• Ensure network security designs are operationally viable, supportable, and aligned with business and operational requirements.
• Support the successful implementation and transition of approved solutions into operational environments.
• Lead and mentor security professionals, fostering a culture of security excellence and continuous improvement.
• Promote security best practices across architecture, engineering, and operational teams.

Key Stakeholders

• Chief Information Security Officer (CISO)
• Group Head of Security Architecture
• Senior Business and Technology Leaders
• Enterprise, Technical, and Solution Architects
• Programme and Project Sponsors
• Network Operations and Engineering Teams
• Business Protection Teams
• External Suppliers and Strategic Partners

Your Profile

Essential Skills / Knowledge / Experience

• Extensive experience in Network Security Architecture or a similar cyber security leadership role within a large and complex enterprise environment.
• Strong expertise in enterprise network architecture across both corporate and Operational Technology (OT) environments.
• Proven experience designing secure WAN, LAN, cloud, and hybrid network solutions.
• Extensive knowledge of network security technologies, including firewalls, VPNs, NAC, IDS/IPS, DLP, SIEM platforms, and wireless security.
• Experience applying recognised security frameworks and standards, including:
• NIST; ISO 27001; OWASP; SANS Critical Security Controls; Cyber Essentials.
• Strong understanding of cyber security risk management and threat modelling methodologies.
• Experience implementing architecture methodologies such as TOGAF and/or SABSA.
• Proven ability to influence senior stakeholders and lead cross-functional initiatives.
• Excellent communication and stakeholder management skills, with the ability to translate complex technical concepts into business-focused outcomes.
• Strong understanding of Operational Technology security and the challenges associated with securing industrial environments.

Desirable Skills / Knowledge / Experience:

• CISSP or equivalent information security certification.
• Network certifications such as CCNP or CCIE.
• Security vendor certifications including PCNSE, NSE7, CCSA, or JNCIS.
• Experience within manufacturing, automotive, or industrial sectors.
• OT security experience, including knowledge of IEC/ISA 62443 standards.
• Understanding of IoT, Connected Vehicle, and Smart Manufacturing technologies.
• Familiarity with governance and service management frameworks such as COBIT and ITIL.

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 UKI.recruitment@tcs.com 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 UKI.recruitment@tcs.com 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 (optional)

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 - UKI.recruitment@tcs.com
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 UKI.recruitment@tcs.com 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.

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