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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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Role: Security Operations Engineer

Duration: 6-month rolling contract

Rate: Up to £650 Inside IR35

Working Pattern: Hybrid - multiple UK locations

GCS Cyber are partnered with a global organisation enhancing their Cyber Security Operations capability as part of a wider security transformation. They are now seeking a Security Operations Engineer with deep hands‑on experience across SecOps tooling, detection engineering and incident response enablement.

Key Responsibilities

Engineer and optimise SIEM, EDR/XDR, SOAR, PAM and vulnerability platforms.Develop and tune detections (KQL/Sigma) to improve visibility and reduce false positives.Support SOC teams with investigations, tooling improvements and root cause analysis.Build automation workflows and SOAR playbooks to streamline response.Improve logging, telemetry and threat‑hunting capabilities.Ensure platform health, performance and operational resilience.

Required Experience

Strong background in SecOps, SOC engineering or technical cybersecurity roles.Hands‑on experience with SIEM (Splunk or Sentinel), EDR/XDR, SOAR and PAM tools.Proven ability to build/tune detections and optimise alerting.Familiar with incident response processes and threat detection methodologies.Solid technical knowledge across networks, endpoints, cloud, and security tooling.

To find out more, please apply now or send a copy of your CV to [email protected].

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

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Data & AI Security Engineer

Role Overview

The Data & AI Security Engineer is responsible for protecting sensitive data and ensuring AI technologies are used securely. This is a hands-on technical role focused on defining security standards, implementing controls, and improving the organisation's overall data and AI security posture. The role will manage security tooling, identify risks, and work with teams across IT, Data, AI Governance, Privacy and Legal to ensure compliance with regulations like GDPR and the EU AI Act.

Key Responsibilities

Data & AI Security

Define and maintain data and AI security policies, standards, and secure design patterns.Implement and manage data protection controls using Microsoft Purview.Manage Data Security Posture Management (DSPM) and AI Security Posture Management practices.Improve visibility and protection of sensitive data through classification, labelling and DLP policies.

Governance & Compliance

Establish processes for managing data and AI security risks, exceptions and non-compliance.Ensure security controls align with regulatory and internal requirements (e.g. GDPR, AI Act).Produce metrics and reporting on the organisation's data and AI security posture.

Collaboration & Support

Work with Data, AI Governance, Privacy and Legal teams to ensure secure data usage.Support security architecture reviews for data platforms, analytics and AI initiatives.Assist incident response for data leaks, insider risks or AI-related security issues.

Success Measures

Success in this role will include:

Published and adopted Data & AI security standards and architecture patterns.Improved visibility and protection of sensitive data.Effective governance and remediation of data and AI security risks.Strong controls supporting safe adoption of AI technologies.

Desired Experience

Experience cybersecurity or IT security.Focused on data security or information protection.Hands-on experience with Microsoft Purview data protection controls.Experience managing security governance, remediation workflows and compliance reporting.

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

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Network Security Engineer - Abu Dhabi (Tax‑Free)Location: Abu Dhabi, UAE NET Take‑Home: £100,000 - £150,000 (tax‑free) Full Relocation Package for You & Your FamilyContract: 18‑month fixed term Visa Processing: 3-5 days (family included) Accommodation: Provided (partial housing allowance) Flights: Included for you and your family Healthcare: Full private medical for you and your family Notice Period: 1 month

We are seeking an experienced Network Security Engineer to join a major organisation in Abu Dhabi, working on a large‑scale, cloud‑first security transformation. This is a hands‑on engineering role focused on SASE, Zscaler (ZIA/ZPA), FortiGate firewalls, and enterprise Wi‑Fi security.

You'll be responsible for designing, deploying, and operating secure network architectures across on‑prem, cloud, and remote environments - with full ownership rather than simply maintaining existing platforms. If you enjoy building, optimising, and securing modern network environments end‑to‑end, this role will suit you perfectly.

Key ResponsibilitiesZscaler (ZIA & ZPA) / SASELead deployment and daily operations of Zscaler Internet Access (ZIA) and Zscaler Private Access (ZPA)Design traffic forwarding architectures (GRE, IPsec)Manage identity and authentication integrations

Configure and maintain Zscaler security controls:

URL filteringCloud firewallSSL inspectionThreat preventionAccess controlOnboard new users and sites, supporting remote and branch connectivityOptimise local internet breakout and cloud‑first routingNetwork Security / FortiGateDeploy and manage FortiGate firewallsDesign and maintain policies, NAT, VPNs, and routing (BGP/static)Integrate FortiGate with Zscaler for secure egress and private accessEnterprise Wi‑Fi SecuritySupport rollout and configuration of secure enterprise Wi‑FiDesign SSIDs, segmentation, and authentication (including 802.1X)Troubleshoot performance, coverage, and connectivity issuesCross‑Domain TroubleshootingDiagnose complex issues across cloud, on‑prem, and remote environmentsWork across networking, security, and user connectivityOwn deployments end‑to‑end Ideal CandidateStrong hands‑on experience with Zscaler ZIA & ZPASolid operational knowledge of FortiGate firewallsExperience with enterprise Wi‑Fi securityComfortable designing and deploying secure, cloud‑first architecturesStrong troubleshooting skills across multi‑layered environmentsAble to take ownership of deployments, not just maintain existing systems

If interested, please apply and a consultant will be in touch ASAP!

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

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