Overview
Role: Network Security Lead
Job Type: Permanent
Location: Dublin (2 days per week in the office and monthly travel to Letterkenny, Donegal)
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.
Gain access to endless learning opportunities.
Fast track your growth with diverse career opportunities internally.
Grow your career, while being exposed to new technologies.
The Role
The Network Security Lead will be accountable for the ownership, design, and effectiveness of network security controls across the organisation. They will provide security architecture assurance to ensure network designs align with security standards, risk appetite, and regulatory requirements.
The lead will also be responsible for identification and implementation of operational security improvements, driving resilience, threat reduction, and continuous improvement across network services. Collaborates with infrastructure, architecture, and risk teams to embed security by design, oversee control performance, and respond to emerging threats and vulnerabilities within the network estate.
Key Responsibilities
Own hybrid network security controls across cloud and on‑prem environments, including firewalls, segmentation, secure connectivity, DDoS protection, WAF, and remote access.
Provide security architecture assurance for cloud connectivity and network designs, ensuring strong segmentation and secure-by-design patterns for aviation and corporate systems.
Embed Zero Trust networking principles, enforcing identity‑aware access, least privilege, and consistent policy controls across cloud and hybrid environments.
Drive operational security and resilience improvements, reducing attack surface, improving configuration hygiene, and strengthening availability for business‑critical aviation services.
Ensure effective network security monitoring and detection, integrating cloud and on‑prem telemetry into SIEM/SOAR and maintaining relevant detection use cases.
Lead vulnerability and exposure management for network infrastructure and cloud network services, prioritising remediation and managing risk acceptance where required.
Support network‑related security incidents, leading containment and recovery activities, performing root cause analysis, and driving post‑incident improvements.
Govern supplier and partner network security, assuring secure integrations across the aviation ecosystem and supporting audit, risk, and compliance requirements.
Your Profile
Essential skills/knowledge/experience:
Extensive experience in cybersecurity or network security, with at least 4+ years in a lead or senior role focused on designing, governing, and operating enterprise network security controls across cloud and hybrid environments (e.g. firewalls, segmentation, secure connectivity, WAF, DDoS protection)
Senior network security professional with strong experience across cloud (AWS/Azure) and hybrid environments, owning network security controls end‑to‑end in complex, regulated enterprises.
Proven track record in security architecture assurance, delivering secure‑by‑design network solutions with effective segmentation, resilience, and alignment to organisational risk appetite.
Deep understanding of cloud‑native networking and security (VPC/VNet design, private connectivity, WAF, DDoS protection, Zero Trust/SASE), including high‑availability and mission‑critical services.
Operationally focused leader who drives continuous improvement, reduces attack surface, and improves control effectiveness through automation, standardisation, and control tuning.
Strong incident response and problem‑solving capability, acting as escalation lead for network‑related security incidents and translating lessons learned into lasting control improvements.
Experienced stakeholder and supplier manager, comfortable engaging architecture boards, infrastructure teams, third parties, and regulators within complex aviation ecosystems.
Risk‑aware and compliance‑driven, with experience supporting audits and frameworks, producing clear security assurances, metrics, and evidence for governance and decision‑making
Relevant network security certifications (e.g. CCNP Security, CISSP, CCSP, Azure Network Engineer Associate, AWS Advanced Networking – Specialty).
Experience designing, implementing, and operating enterprise network security controls including firewalls, IDS/IPS, WAF, DDoS protection, VPNs, and network segmentation.
Strong knowledge of cloud networking and cloud‑native security controls (AWS VPC / Azure VNet, routing, private endpoints, security groups, NACLs, load balancers).
Experience securing hybrid network environments spanning on‑prem infrastructure and cloud services, including private connectivity (ExpressRoute / Direct Connect).
Practical understanding of Zero Trust networking principles and modern access models (e.g. ZTNA, least‑privilege network access, identity‑aware controls).
Experience with network security monitoring and incident response, including SIEM integration, log analysis, detection use‑case development, and root cause analysis.
Knowledge of network security governance, risk, and compliance, including audit support, control assurance, and working within regulated or safety‑critical environments.
Exposure to third‑party and supplier network integrations, managing secure connectivity and shared responsibility within complex ecosystems (e.g. aviation partners)
TCS is consistently voted a Top Employer in the UK and globally. Our competitive salary packages feature pension, health care, life assurance, laptop and 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 and partner with our local communities in Ireland.
Diversity, Inclusion and Wellbeing
Tata Consultancy Services UK&I is committed to meeting the accessibility needs of all individuals in accordance with the Ireland Employment Equality Acts 1998-2011 (as amended) and the Equal Status Acts 2000-2012 (as amended).
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 email jennifer.long@tcs.com to request an adjustment. We welcome requests prior to you completing the application and at any stage of the recruitment process.
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.
Join us and do more of what matters. Apply online now.
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