Security Architect – Design & Operation
At Three Ireland, 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 will shape how security is architected, embedded, and run, ensuring controls are well designed, measurable, resilient, and effective, in line 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, SOC, and MSPs.
Broad technical knowledge across enterprise IT, networks (WAN/LAN), and cloud.
Excellent communication and stakeholder engagement skills.
Security architecture (application, infrastructure, cloud).
Incident response & forensic investigation.
Vulnerability management & remediation.
Third‑party security governance.
Data protection & privacy.
ISSP, CISMC, RISCISO 2, 7001, Data Protection, PCI certification.
Benefits
Flexible working with a hybrid model, allowing a balanced mix of home and office.
Competitive salary, annual performance bonus, and pension contributions.
Annual leave with the option to buy or sell up to 5 days.
Health and insurance through a flexible benefits program.
Access to learning & development tools such as Coursera.
Free on‑site parking.
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.
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