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Cyber Security Engineer

Secure by Design & Security Platforms

6-Month Contract | Inside IR35 | London 1-2 Days Per Week

We're seeking a hands-on Cyber Security Engineer to embed Secure by Design principles across technology programmes while helping improve and optimise a suite of enterprise security platforms.

This is an excellent opportunity for a security professional who enjoys working across architecture, engineering and delivery teams, influencing projects from inception through to deployment while providing practical, pragmatic security guidance.

Key Experience

✅ Secure by Design & Security Assurance
✅ Security Architecture & Design Reviews
✅ Threat Modelling & Risk Identification
✅ Microsoft Security Stack (Identity, Endpoint, Cloud & Monitoring)
✅ Security Platform Configuration & Support
✅ Security Standards, Controls & Governance
✅ Vendor & Security Tool Management
✅ Stakeholder Engagement Across Engineering & Delivery Teams

What You'll Be Doing

Embed security into projects and programmes from day oneConduct security design reviews and lightweight threat modellingDrive security assurance throughout the delivery lifecycleEnhance configuration, adoption and effectiveness of security platformsSupport onboarding and implementation of new security toolingAct as a key liaison between Security, Architecture, Engineering and Delivery teamsDevelop practical standards, templates and guidance to improve secure-by-design outcomesManage platform-related requests, vendor engagement and continuous improvement initiatives

Ideal Background

Strong experience delivering Secure by Design outcomes within complex enterprise environmentsExperience reviewing solution architectures and identifying pragmatic security controlsHands-on experience with Microsoft security technologiesExposure to cloud, infrastructure, applications and integration securityExperience supporting or administering security tooling and platformsAbility to operate independently and quickly add value in a fast-paced environment

Desirable

Security Architecture or Engineering backgroundIAM technologies such as One Identity, Delinea or StrongDMExperience within regulated, utilities, energy or critical infrastructure environments

A great opportunity for a delivery-focused security contractor to influence major technology initiatives, improve security engineering practices and help drive a Secure by Design culture across a large and complex organisation.

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

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

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Security Architect - Consultant Advisory

12-Month Contract | Outside IR35 | Hybrid (2 days per week on-site)
Location: West London / Greater London

We are supporting a major UK transport infrastructure organisation undergoing a significant programme of cyber security improvement and technology transformation.

We are seeking an experienced Security Architect Consultant to provide advisory support across a complex digital estate, reviewing security architectures, assessing risks, and supporting the delivery of security improvements across critical technology platforms.

This role will involve working with technical teams, architects, and senior stakeholders to review existing security controls, improve security design practices, and support the implementation of secure technology solutions across a highly regulated environment.

Key ResponsibilitiesReview and refresh existing Cyber Security Impact Assessments (CSIAs) across a portfolio of live digital products and services.Assess existing threat models and security architectures to ensure they reflect current risks and technology changes.Provide security architecture guidance across projects from initial design through to delivery.Conduct security risk assessments and provide recommendations for security improvements.Support technical teams with secure design reviews and architectural assurance.Review and advise on security improvements across areas including:Network securityFirewall technologiesSecure remote access / VPN solutionsVirtualisation environmentsSecurity monitoring and endpoint protection toolingIdentity and access controlsInfrastructure securityWork with engineering and DevOps teams to ensure security is embedded throughout the delivery lifecycle.Produce clear security documentation, architectural recommendations, and risk treatment plans.Support governance activities and security assurance processes.Required ExperienceProven experience working as a Security Architect / Cyber Security Consultant within complex enterprise environments.Strong background in security architecture, risk assessments and technical security reviews.Experience reviewing and producing security impact assessments or similar security assurance documentation.Ability to assess technical solutions and provide practical security recommendations.Strong understanding of:Network security architectureFirewalls and secure connectivityVPN technologiesSecurity monitoring solutionsEndpoint security controlsCloud and infrastructure securityExperience working across large-scale transformation or improvement programmes.Excellent stakeholder management and communication skills.Desirable ExperienceExperience within aviation, transport, critical national infrastructure (CNI), or other highly regulated sectors.Previous experience supporting environments with operational technology (OT) considerations.Familiarity with safety-critical systems and complex infrastructure environments.Experience working with DevOps / continuous improvement teams.Existing SC Clearance or ability to obtain SC Clearance.Contract DetailsContract Length: 12 monthsIR35 Status: Outside IR35Working Pattern: Hybrid - 2 days per week on-siteStart Date: August / SeptemberRate: Competitive day rate available

This is an excellent opportunity for a Security Architect to support a high-profile cyber improvement programme within a complex, mission-critical environment.

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

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🔐 Information Security Consultant | Remote (UK & Ireland)

📍 Remote (UK & Ireland)
💼 Permanent
🚫 Sponsorship is not available

Ideal Background

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

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Site Reliability Engineer III (AI Platform)

Location: Mount Laurel, NJ (Onsite)
Duration: Contract
Experience: 4+ years

About the Role

We are seeking a Site Reliability Engineer (SRE) III to support a cutting-edge AI Platform Engineering team responsible for building and maintaining the infrastructure behind enterprise AI and machine learning applications. This is an exciting opportunity to work on large-scale distributed systems, Kubernetes environments, and cloud-native platforms that power next-generation AI solutions.

The ideal candidate has a strong background in cloud infrastructure, Kubernetes, Infrastructure as Code, observability, and automation. Experience supporting production environments at scale is essential.

Responsibilities

Design, implement, and support highly available, scalable, and secure cloud infrastructure.

Maintain and improve Kubernetes-based production environments.

Deploy and support AI/ML applications across cloud platforms.

Automate infrastructure provisioning and operational processes using Terraform and scripting.

Build and maintain CI/CD pipelines using GitHub Actions.

Monitor system health and performance using Prometheus, Grafana, Datadog, CloudWatch, Elasticsearch, and logging tools.

Troubleshoot production issues across distributed systems, cloud infrastructure, networking, and containerized applications.

Partner with development teams to improve application reliability, scalability, and performance.

Participate in incident response, root cause analysis, and continuous service improvements.

Support large-scale Kubernetes clusters and cloud-native workloads.

Required Qualifications

Bachelor's degree in Computer Science or a related technical field (or equivalent experience).

4+ years of experience in Site Reliability Engineering, DevOps, Platform Engineering, or Cloud Infrastructure.

Strong understanding of distributed systems, software design, algorithms, and system performance.

Experience programming or scripting with one or more of the following:

Python

Bash

Go

Java

C/C++

Strong troubleshooting and problem-solving skills.

Excellent communication and collaboration abilities.

Required Technical SkillsCloud Platforms

AWS (required)

Azure or GCP

Containers & Orchestration

Kubernetes (required)

Docker

Amazon EKS

Google GKE/GKS

Infrastructure as Code

Terraform (required)

CI/CD

GitHub Actions

CI/CD pipeline automation

Monitoring & Observability

Prometheus (required)

Grafana

Datadog

CloudWatch

Elasticsearch

Centralized logging solutions

Additional Technologies

MySQL

Kafka

Preferred Qualifications

Experience supporting AI/ML platforms or machine learning infrastructure.

Experience with GPU-based workloads.

Knowledge of AI model deployment or MLOps.

Experience automating operational processes.

Familiarity with enterprise-scale Kubernetes environments.

Nice to Have

Python or Go development experience.

Experience with ETL workflows.

Exposure to AI/ML technologies, LLMs, or agentic AI platforms.

Keywords

Site Reliability Engineer | SRE | DevOps | Platform Engineer | Kubernetes | AWS | Terraform | Docker | EKS | GKE | GitHub Actions | Prometheus | Grafana | Datadog | CloudWatch | Elasticsearch | Kafka | Python | Bash | Go | Infrastructure as Code | Observability | AI Platform | Machine Learning | Cloud Infrastructure | Distributed Systems

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

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Site Reliability Engineer III (AI Platform)

Location: Mount Laurel, NJ (Onsite)
Duration: Contract
Experience: 4+ years

About the Role

We are seeking a Site Reliability Engineer (SRE) III to support a cutting-edge AI Platform Engineering team responsible for building and maintaining the infrastructure behind enterprise AI and machine learning applications. This is an exciting opportunity to work on large-scale distributed systems, Kubernetes environments, and cloud-native platforms that power next-generation AI solutions.

The ideal candidate has a strong background in cloud infrastructure, Kubernetes, Infrastructure as Code, observability, and automation. Experience supporting production environments at scale is essential.

Responsibilities

Design, implement, and support highly available, scalable, and secure cloud infrastructure.

Maintain and improve Kubernetes-based production environments.

Deploy and support AI/ML applications across cloud platforms.

Automate infrastructure provisioning and operational processes using Terraform and scripting.

Build and maintain CI/CD pipelines using GitHub Actions.

Monitor system health and performance using Prometheus, Grafana, Datadog, CloudWatch, Elasticsearch, and logging tools.

Troubleshoot production issues across distributed systems, cloud infrastructure, networking, and containerized applications.

Partner with development teams to improve application reliability, scalability, and performance.

Participate in incident response, root cause analysis, and continuous service improvements.

Support large-scale Kubernetes clusters and cloud-native workloads.

Required Qualifications

Bachelor's degree in Computer Science or a related technical field (or equivalent experience).

4+ years of experience in Site Reliability Engineering, DevOps, Platform Engineering, or Cloud Infrastructure.

Strong understanding of distributed systems, software design, algorithms, and system performance.

Experience programming or scripting with one or more of the following:

Python

Bash

Go

Java

C/C++

Strong troubleshooting and problem-solving skills.

Excellent communication and collaboration abilities.

Required Technical SkillsCloud Platforms

AWS (required)

Azure or GCP

Containers & Orchestration

Kubernetes (required)

Docker

Amazon EKS

Google GKE/GKS

Infrastructure as Code

Terraform (required)

CI/CD

GitHub Actions

CI/CD pipeline automation

Monitoring & Observability

Prometheus (required)

Grafana

Datadog

CloudWatch

Elasticsearch

Centralized logging solutions

Additional Technologies

MySQL

Kafka

Preferred Qualifications

Experience supporting AI/ML platforms or machine learning infrastructure.

Experience with GPU-based workloads.

Knowledge of AI model deployment or MLOps.

Experience automating operational processes.

Familiarity with enterprise-scale Kubernetes environments.

Nice to Have

Python or Go development experience.

Experience with ETL workflows.

Exposure to AI/ML technologies, LLMs, or agentic AI platforms.

Keywords

Site Reliability Engineer | SRE | DevOps | Platform Engineer | Kubernetes | AWS | Terraform | Docker | EKS | GKE | GitHub Actions | Prometheus | Grafana | Datadog | CloudWatch | Elasticsearch | Kafka | Python | Bash | Go | Infrastructure as Code | Observability | AI Platform | Machine Learning | Cloud Infrastructure | Distributed Systems

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

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Cyber Security Engineer - Microsoft 365 & Azure

6-Month Contract | Outside IR35 | £350-400 per day | Remote (UK) | 1-2 Days per Month On-Site (South West London)

A leading public sector organisation is looking for a Cyber Security Engineer to support a major cyber security improvement programme.

Working alongside the Cyber Security, Infrastructure and Platform teams, you'll help deliver a range of security enhancements across Microsoft 365, Azure and AWS, strengthening the organisation's overall security posture while improving identity, endpoint, cloud and data protection capabilities.

This is a fantastic opportunity for someone who enjoys hands-on engineering and wants to be involved in delivering meaningful security improvements across a large enterprise environment.

Key ResponsibilitiesDeliver security improvement projects across Microsoft 365, Azure and AWS.Implement and enhance security controls across identity, endpoint, cloud and data protection.Configure and support Microsoft Intune, Microsoft Defender, Microsoft Purview and related Microsoft security technologies.Assist with SIEM configuration, alert tuning and security monitoring.Support Identity & Access Management improvements, including MFA, Conditional Access and Microsoft Entra ID.Work closely with Infrastructure, Platform and Service Desk teams to plan and implement security changes.Assist with vulnerability management and endpoint security improvements.Support cloud security initiatives across Azure and AWS.Produce clear technical documentation and operational handover documentation.Work collaboratively with internal technical teams to ensure successful delivery of security initiatives.Essential Experience

We're looking for someone with experience across several of the following areas:

Experience working as a Cyber Security Engineer within an enterprise environment.Good knowledge of Microsoft 365 and Azure security.Experience with Microsoft Intune and Microsoft Defender.Understanding of Identity & Access Management, including Microsoft Entra ID, MFA and Conditional Access.Experience supporting or configuring SIEM platforms (Microsoft Sentinel or similar).Knowledge of endpoint security and vulnerability management.Experience working within Azure and/or AWS environments.Basic PowerShell scripting skills.Experience delivering technical projects and working with multiple technology teams.Strong communication skills with the ability to produce clear technical documentation.Desirable Experience

Experience in any of the following would be beneficial but is not essential:

Microsoft Purview, DLP or Information Protection.Zscaler (ZIA/ZPA).AWS Security.Infrastructure-as-Code (Terraform, Bicep or ARM Templates).Experience within the UK Public Sector or another regulated environment.Knowledge of UK GDPR, PSN or PCI DSS.Contract DetailsRole: Cyber Security Engineer - Microsoft 365 & AzureContract: 6 MonthsDay Rate: £350-400 per dayIR35 Status: Outside IR35Location: Remote (UK)Travel: 1-2 days per month on-site in South West LondonStart Date: ASAP

This is an excellent opportunity to join a high-profile cyber security programme, working on modern Microsoft security technologies within a collaborative team while enjoying the flexibility of a predominantly remote contract.

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

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GRC Lead

📍 Ireland | Hybrid

Help organisations become more resilient.

Cyber Security isn't just about technology.

The organisations that succeed are the ones with strong governance, mature security processes and practical risk management frameworks.

We're looking for an experienced GRC Lead to help enterprise organisations assess where they are today and build a clear roadmap for where they need to be.

You'll work closely with senior stakeholders, delivering cyber maturity assessments, governance programmes and security improvement initiatives that make a genuine business impact.

If you enjoy working with customers, solving strategic security challenges and helping organisations mature their security capability, we'd love to hear from you.

You'll be involved in:

ISO 27001 maturity assessmentsISO 27001 implementationsSecurity governance programmesCyber maturity assessmentsRisk management frameworksNIST Cyber Security FrameworkSecurity policies, standards and proceduresGRC tooling and governance processes

We're looking for someone with:

✔ 6-12 years' Cyber Security experience

✔ Strong Governance, Risk & Compliance background

✔ ISO 27001 implementation experience

✔ Experience delivering maturity assessments

✔ Excellent stakeholder management skills

✔ Client-facing consulting experience

Why join?

Work on strategic cyber transformation programmesExposure to senior executive stakeholdersExcellent progression opportunitiesStrong learning and certification supportHybrid workingCompetitive salary, bonus and benefits

Interested? Let's have a confidential conversation.

GCS is acting as an Employment Agency 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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Role Overview

The organization is seeking a seasoned IT Program Manager to lead one or more highly complex, enterprise‑wide programs consisting of multiple interconnected projects. This role focuses heavily on security audit readiness, compliance remediation, and cross‑functional program delivery across a large enterprise environment.

You will be responsible for developing program strategy, building business cases, creating high‑level project plans, and ensuring seamless integration across all workstreams. The ideal candidate brings deep experience in security, compliance, and technical project management, along with strong leadership and communication skills.

Key Responsibilities

Manage and deliver enterprise‑wide IT programs involving multiple projects, stakeholders, and technical teams.

Develop program strategy, business cases, and high‑level plans aligned with organizational goals.

Ensure audit readiness and drive remediation efforts based on findings from global or enterprise security audits.

Oversee compliance initiatives related to SOC2, ISO frameworks, vulnerability management, and other security standards.

Track key milestones, identify risks, and recommend adjustments to project managers and leadership.

Communicate program direction, updates, and changes to senior IT and business leaders.

Partner with executive stakeholders to identify and prioritize opportunities for leveraging IT to meet enterprise objectives.

Coordinate creation of technical architecture documentation and system diagrams as needed.

Ensure all projects are delivered on time, within budget, and aligned with strategic requirements.

Required Qualifications

7+ years of project management experience, preferably in technical, security, or compliance domains.

Strong understanding of security audits, compliance frameworks (SOC2, ISO, etc.), vulnerability management, and remediation workflows.

Proven ability to lead large-scale, enterprise-wide initiatives with cross-functional teams.

Excellent executive communication skills, including preparing presentations and briefing senior leadership.

Experience with technical documentation, architecture diagrams, and system mapping.

Proficiency with project management tools such as Jira, Confluence, MS Project, or equivalent.

Bachelor's or Master's degree in Computer Science, Business Administration, or related field (or equivalent experience).

Project Management certification (PMP, PgMP, or equivalent) required.

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

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