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 aoife.omeara@three.ie.
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