Security Architect - Design&Operations, Dublin

Security Architect - Design&Operations At ThreeIreland, we’re looking for an experienced Security Architect to play a key role within our wider security and technology teams, helping to ensure security is embedded across the design and operation of our IT, Network, Cloud, and Digital services. This role shapes how security is architected, embedded, and run, ensuring our controls are well‑designed, measurable, resilient, and effective in practice, and align with industry best‑practice, regulatory obligations, and the Three Ireland Security Policy.

Responsibilities

Help shape enterprise security architecture across applications, infrastructure, networks, mobile, and cloud

Embed secure‑by‑design principles across technology initiatives

Oversee security operations, including incident response, monitoring, and managed security services

Act as a senior escalation point during major security incidents

Drive risk management, resilience, and regulatory compliance (ISO 27001, NIST, NIST 2, GDPR, PCI DSS)

Partner with IT, Network, Cloud, and external providers to deliver secure, scalable solutions

Influence senior stakeholders by translating technical risk into business impact

Qualifications

5+ years in senior cybersecurity roles across architecture, risk, and operations

Strong hands‑on expertise in security design and operational controls

Experience with incident response, SOCs, and MSPs

Broad technical knowledge across enterprise IT, networks (WAN/LAN), and cloud

Excellent communication and stakeholder engagement skills

Threat modelling&risk assessment

Security architecture (application, infrastructure, cloud)

Incident response&forensic investigation

Vulnerability management&remediation

Third‑party security governance

Data protection&privacy

Desirable

CISSP

CISM

CRISC

ISO 27001

Data Protection

PCI certifications

Benefits

Flexible working with our Hybrid model– employees enjoy flexibility working from home and office locations (3 days per week office based).

Competitive salary, annual performance bonus&pension contribution

25 days holidays plus 2.5 company days

Annual Leave buy or sell (up to 5 days AL each year)

Healthcare Insurance through our flexible benefits programme

Life assurance, phone&laptop, subsidised canteen

Access to learning&development tools such as Coursera

Free on‑site parking

EEO&Accessibility Statement At Three, we are committed to equity, diversity and inclusion. As Ireland’s largest mobile telecommunications provider, we provide a better connected life for our diverse customer base and want our teams to reflect this. We welcome and celebrate all identities and strive to create a culture of belonging where employees can thrive as their authentic selves. If you do not ‘tick every box’ in this job description, you likely have other valuable skills that would make you a great fit for one of our teams. If you require reasonable adjustments for your interview, please let us know when scheduling your interview, or email .

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