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Cloud & Security Engineer (12-Month Contract)

Location: Dublin (Hybrid - 3 days onsite)
Contract: 12 Months | Daily Rate

An Irish organisation is looking for an experienced Cloud & Security Engineer to support and enhance its Microsoft cloud and security environment.

You'll play a key role across cloud infrastructure, identity, endpoint security and incident response while helping to strengthen security posture and modernise IT operations.

Key ResponsibilitiesManage Microsoft Entra ID, Conditional Access, MFA and Privileged Identity Management (PIM)Administer Microsoft Intune and Microsoft Defender XDRMonitor and investigate security events using Microsoft SentinelSecure Azure environments using Zero Trust principlesProvide Level 3 support and technical leadershipSupport ITIL processes including Incident, Change and Problem ManagementProduce technical documentation, runbooks and operational proceduresWhat You'll NeedStrong experience with Microsoft Azure and Microsoft security technologiesHands-on expertise with Entra ID, Intune, Defender XDR and SentinelExperience with security incident response and identity & access managementExcellent troubleshooting and stakeholder communication skillsAZ-500 certification is essential (SC-200, SC-300 and/or MD-102 also highly desirable)

If you're looking for a long-term contract working with modern Microsoft cloud and security technologies, we'd be happy to tell you more.

GCS is acting as an Employment Business in relation to this vacancy.

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As a Senior Cyber Security Engineer, you will play a critical role in delivering cyber strategies, with responsibility for the design, implementation, and ongoing effectiveness of security capabilities across IT and OT environments.

You will engineer and maintain the technical capabilities that enable early threat detection, rapid and consistent response, and sustained cyber risk reduction, while translating cyber risk, regulatory, and business demands into practical, measurable, and operationally sustainable security controls.

This is a hands‑on engineering role for individuals who enjoy building resilient security capabilities, integrating platforms and telemetry, and turning strategy, risk, and incident learnings into practical engineering outcomes. The role requires a strong understanding of security engineering concepts, infrastructure technologies, and best practices, along with the ability to collaborate effectively across IT, OT, and security operations to drive continuous improvement.

You must be able to obtain Counter Terrorist Check (CTC) Clearance to be eligible for this position.

What you'll be doing as a Senior Cyber Security Engineer

Collaborate with stakeholders to design, implement and maintain security controls to meet business, compliance, and risk mitigation requirements; ensuring controls are effective, measurable, and operationally sustainable.Implement and maintain detection and response capabilities through SIEM integration with security controls and IT systems, with a focus on reducing time‑to‑detect and time‑to‑remediate through improved pre‑incident engineering.Participation in a 24x7 on‑call support rota, responding to SIEM health alerts and restoring log ingestion where required.Manage use cases, perform data enrichment, and define standardised and automated containment workflows.Develop and manage operational procedures and reporting methodology.Manage and oversee security technology platforms (e.g. SIEM, SOAR, EDR, and email security).Monitor ongoing control performance and coordinate remediation where gaps are found.Automate operation procedures and reporting processes and integrate outputs into risk reporting frameworks.Liaise with IT and OT teams to ensure controls are implemented according to agreed baselines.Align control design with industry standards, regulations, and best practices. (e.g. NIS, ISO27001, GDPR).Support audits, reviews, and assessments of security controls.Identify and implement improvements to control coverage and resilience.Proactively advise on technology, best practices, and delivery models.

What you should bring to the role

Experience in Security Engineering, with a focus on detection & response engineering in an enterprise environment.Strong understanding of both IT and OT systems and infrastructure.Experience in identifying and remediating cyber risks in evolving digital environments.Familiarity with SIEM, EDR, email security and identity and access management technologies (e.g. Entra ID, CyberArk).Familiarity with a range of operating systems and security considerations across SaaS, IaaS, end-user computing, and server estate.Sound knowledge of cloud and network security technologies.Strong analytical, planning, and organisational skills.Ability to communicate technical issues clearly to non-technical stakeholders.Degree in Cyber Security, Computer Science, Information Technology, Engineering, or a related field.Industry certification(s) such as CISSP, CCSP, CompTIA Security+, or SC-200.

It would be great if you also had

Previous experience working in a large, complex infrastructure-based or water utility organisation.Experience in systems or network administration in IT and/or OT environments.Experience leading or mentoring others in delivering cybersecurity outcomes.Security engineering vendor or product certifications such as Microsoft Certified: Azure Security Engineer Associate, Tenable, or CyberArk.

GCS is acting as an Employment Agency in relation to this vacancy.

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Senior Consultant - AI Security & Threat Modelling (GenAI / Agentic AI)

We are supporting a large, regulated financial services organisation that is building a central GenAI threat‑modelling and consultancy capability.

This role sits within a specialist threat‑modelling team, advising GenAI and Agentic AI projects early in design, before solutions reach production.

This is not a coding role and not a general cyber role.

Key Responsibilities

Hands‑on threat modelling of GenAI and Agentic AI systemsAdvising application teams on AI‑specific risks, including:Prompt injectionAgent intent hijackingUnsafe autonomy and tool misuseMissing safety rails / kill switches (e.g. MCP‑style controls)Misalignment and behavioural driftActing as an internal consultant, working with:Application ownersArchitectsDevelopersCyber security teamsChallenging designs constructively and recommending practical mitigations

Required Experience

Proven hands‑on threat modelling experience (practical, not just frameworks)Strong GenAI / Agentic AI knowledge with real project examplesFamiliarity with OWASP GenAI / LLM risks
(generic OWASP or ISO references alone are not sufficient)Strong grounding in cyber security threats and controlsExperience working in a large organisation with mandated security standardsConfident engaging and holding your own with senior engineers and architects

Details

Location: Sheffield or London1 day per week on‑site preferredFully remote considered for the right candidateInterviews: 1 stage (next week)Start: ASAP

If you are currently threat‑modelling GenAI or agentic AI systems and advising teams on how to build them safely, we'd like to hear from you.

📧 [email protected]

GCS is acting as an Employment Business in relation to this vacancy.

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Cyber Security OT Engineer

📍 Suffolk (1-2 days per week on-site)

Overview
We're looking for an experienced Cyber Security OT Engineer to support and secure critical operational technology environments. You'll work across infrastructure, networks, and security tooling to ensure resilience, compliance, and protection against cyber threats in a regulated environment.

Key Responsibilities

Support and maintain OT security infrastructure (firewalls, SIEM, PAM, IDS, endpoint security)Monitor, troubleshoot, and resolve security incidents and problemsImplement changes in line with strict change control processesSupport OT security projects and continuous improvement initiativesAssist with cyber incident response and recovery activitiesWork with internal teams, vendors, and stakeholders to enhance security postureContribute to security testing, risk mitigation, and compliance (e.g. NIS regulations)Provide input into network security design across WAN/LAN and OT environments

Experience Required

~5+ years in Cyber Security or Networking (ideally within OT / industrial environments)Strong knowledge of network security, firewalls, VPNs, and routingExperience with SIEM, monitoring, and incident responseUnderstanding of OT/SCADA environments and industrial protocols is beneficialFamiliarity with security frameworks (e.g. NCSC, ISO27001, IEC 62443)Experience with tools such as Fortinet, Cisco ISE, or similarKnowledge of Windows/Linux security and virtualised environmentsScripting (PowerShell/Python) desirable

Additional Info

Must be eligible for UK security clearance (SC)Strong stakeholder communication skills required

If interested, please APPLY and a consultant will be in touch asap.

GCS is acting as an Employment Agency in relation to this vacancy.

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Job Summary

We are seeking a skilled Network Security Engineer with strong expertise in Fortinet and Palo Alto security platforms to design, secure, operate, and support mission‑critical IT and telecom network infrastructures. This role is responsible for ensuring the confidentiality, integrity, and availability of core telecom environments-including data centers, network elements, OSS/BSS platforms, and cloud‑based workloads-while maintaining high performance and compliance with regulatory standards.

Key ResponsibilitiesDesign, implement, and maintain secure network architectures across telecom and IT environments.Deploy, configure, and manage Fortinet (FortiGate, FortiManager, FortiAnalyzer) and Palo Alto Networks (NGFW, Panorama) security platforms.Implement firewall policies, NAT, VPNs (IPSec/SSL), threat prevention, URL filtering, and application control.Conduct security hardening, vulnerability remediation, and compliance enforcement across infrastructure.Monitor network and security infrastructure using tools such as Zabbix, Prometheus, SNMP‑based systems, and vendor‑specific dashboardsTroubleshoot complex network and security issues impacting telecom services.

Required Skills & Qualifications

Strong hands‑on experience with Fortinet and Palo Alto Networks firewalls and security ecosystems.Solid understanding of telecom network architecture:IP/MPLS, WAN, LANSIP, SS7, SIGTRAN (basic to intermediate)Deep knowledge of networking fundamentals: TCP/IP, DNS, routing protocols, firewalls, load balancers.Experience with virtualization platforms: VMware, KVM, Hyper‑V.Working knowledge of cloud platforms (AWS, Azure, GCP) and their security models.Experience with monitoring and alerting tools (Zabbix, Prometheus, SNMP).Familiarity with OSS/BSS systems and integration points.Understanding of backup, disaster recovery, and high‑availability systems.Scripting skills in Bash, PowerShell, or Python.

Additional Qualifications

Strong analytical and problem‑solving skills.Ability to work in fast‑paced telecom environments.Excellent communication and documentation abilities.Relevant certifications are a plus:Fortinet NSE4-NSE7Palo Alto PCNSA / PCNSECCNA/CCNP, AWS/Azure certifications, or equivalent

GCS is acting as an Employment Business in relation to this vacancy.

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