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Senior DevSecOps Engineer

Contract | Dublin City Centre (Hybrid - 2 Days Onsite Per Week)

Overview

I'm looking to speak with Senior DevOps & Cloud Security Engineers to join a high-performing technology team delivering secure, scalable, and cloud-native solutions within a complex enterprise environment.

This role offers the opportunity to work across cloud infrastructure, platform engineering, automation, security, and reliability initiatives. The successful candidate will play a key role in designing, implementing, and supporting modern cloud platforms while driving best practices across DevOps, Security, and Site Reliability Engineering disciplines.

Key Responsibilities

Design, deploy, secure, and support cloud-native platforms and applications within AWS environments.Build and manage infrastructure using Infrastructure as Code (Terraform).Administer and support Kubernetes-based container platforms, including Amazon EKS.Implement secure networking, connectivity, and cloud architecture best practices.Develop and maintain cloud security controls, identity management, and access governance frameworks.Contribute to CI/CD pipeline development and automation initiatives.Champion DevSecOps practices throughout the software delivery lifecycle.Implement monitoring, logging, observability, and alerting solutions to enhance platform reliability.Support Linux-based and containerised workloads across development and production environments.Collaborate with cross-functional engineering, development, security, and operations teams.Troubleshoot complex infrastructure, application, and platform issues.Drive operational excellence through automation, standardisation, and continuous improvement initiatives.Support the ongoing enhancement of cloud governance, resilience, and platform security capabilities.

Required Experience

Strong hands-on experience designing and supporting solutions within AWS cloud environments.Extensive experience with Terraform and Infrastructure as Code methodologies.Commercial experience with Kubernetes and container orchestration platforms.Strong knowledge of cloud networking, security, and enterprise infrastructure design.Experience implementing IAM, security controls, and cloud governance frameworks.Background working within DevOps, Platform Engineering, SRE, or Cloud Operations functions.Experience designing and supporting CI/CD pipelines and deployment automation.Strong Linux administration skills.Experience with monitoring, observability, and operational tooling.Excellent troubleshooting and problem-solving skills across infrastructure and application layers.Understanding of modern application architectures, microservices, and cloud-native technologies.

Desirable Skills

Experience with Python, scripting, or infrastructure automation.Exposure to cloud security, compliance, vulnerability management, or security engineering practices.Experience supporting end-to-end web applications and distributed systems.Knowledge of database technologies within cloud environments.Experience with AWS Landing Zone frameworks and enterprise cloud governance models.Familiarity with platform engineering, zero-trust principles, or security-by-design approaches.

Contract Details

Dublin City CentreHybrid Working Model2 Days Per Week OnsiteCompetitive daily rateLong-term programme of work within a modern cloud and infrastructure environment

This opportunity would suit a Senior DevOps Engineer, Cloud Engineer, Platform Engineer, SRE, or Cloud Security Engineer looking to work across automation, cloud infrastructure, Kubernetes, security, and enterprise-scale platform delivery. If you have any questions, apply and we can have a call today.

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

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Application Security Engineer

You'll join a centralised Application Security team responsible for managing the full lifecycle of security findings reported by customers, internal teams, and third‑party testers.

You'll triage real‑world vulnerability reports, reproduce issues in controlled environments, analyse platform‑level attack surfaces, and collaborate with engineering teams to validate fixes and guide remediation.

Day to Day Responsibilities

Validate vunerabilities, assess scope and impact, determine severity, and recommend remediation paths.vulnerabilities across web, API, and server-side components and privilege escalation.Produce clear, accurate security assessments suitable for both engineering teams and executive level.Partner with development teams on defect filing, patch validation, backport decisions, and fix completeness.Recreate customer scenarios in lab environments to verify reported vulnerabilities and confirm remediation.Review server-side and client-side code to trace attack vectors and validate security fixes.

Desired Experience

Relevant eperience in application security, penetration testing, bug bounty triage, or product security engineering.Strong working knowledge of OWASP Top 10 and modern attack classesAbility to read and trace JavaScript and Java codebases to identify vulnerabilities and validate fixes.Experience writing clear, technically accurate security reports for diverse audiences.Fluency in CVSS scoring, including rationale behind severity decisions.

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

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Cloud Security Architect

Contract

Industry: Global FinTech Platform
Location: Hybrid (Amsterdam)
Contract Length: 6-12 months

About the Role

A leading FinTech provider is modernising its global cloud footprint and requires a Cloud Security Architect to design, implement, and govern cloud security standards across multi‑cloud estates. You will be the senior technical authority shaping how secure‑by‑design cloud services are built.

Key Responsibilities

Design secure architectures across AWS and Azure for high‑volume financial services.Define IaC security standards, encryption baselines, and identity patterns.Lead threat modelling, architectural risk assessments, and cloud posture reviews.Support engineering teams with secure build patterns, guardrails, and security automation.Act as a technical SME for cloud security governance and architectural boards.

Skills & Experience

Expert-level knowledge of AWS/Azure native security services.Strong Terraform, Kubernetes, container security, and CI/CD familiarity.Experience in regulated sectors (finance ideal).

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

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Role: Cloud Security Assessment Specialist - B2B

Duration: 6-month rolling contract

Working Pattern: Krakow, Hybrid (handful of days per month)

GCS Cyber are partnered with a global financial services organisation as they continue to strengthen their Cloud Security Assessment function. This role focuses on ensuring cloud‑hosted services meet mandatory security controls before moving into production. You'll act as a senior cloud security specialist, providing assurance, consultancy, and oversight across complex multi‑cloud environments.

What you'll be doing:

Executing Cloud Security Assessment reviews for cloud‑hosted services and managing reviews raisedProviding cloud security consultancy to engineering and application teams, supporting secure design and smooth transition into production.Assessing and applying cloud security controls, ensuring alignment with HSBC standards and regulatory expectations.Driving continuous improvement across assessment processes, including automation, data‑driven insights, and capability uplift.

Must have:

Strong hands‑on experience with Google Cloud Platform AWS, plus exposure to at least one additional cloud platform (Azure or Alibaba Cloud).Solid understanding of cloud security controls, risk, and control frameworks.Working knowledge of scripting and tooling such as Python, Bash, PowerShell, SQL etc…Excellent stakeholder management and communication skills, with the ability to influence across global technology and business teams.

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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Role: Cloud Security Consultant - B2B

Duration: 6-month rolling contract

Working Pattern: Krakow, Hybrid (handful of days per month)

GCS Cyber are working with a global financial services organisation as they continue to strengthen and optimise their Cloud Cyber Security capability. This role focuses on driving cloud security maturity, automation, and governance, with a strong emphasis on Python‑based development alongside hands‑on cyber security expertise.

What you'll be doing:

Designing, developing, and enhancing cloud security solutions and automation using Python web frameworks (e.g. Flask, Django, FastAPI).Assessing and improving cloud security posture and maturity, including cloud security controls, baseline governance, and security scoring initiatives.

Must have:

Strong hands‑on experience securing cloud environments across one or more major cloud providers.Solid background in cyber security governance, including security controls, configuration baselines, and vulnerability assessment (e.g. CVSS).Proven track record delivering well written, well-structured web applications using (but not limited to) Flask, Django, FastAPI

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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AWS Security Architect (Contract)

Location: Remote (UK-based)

Clearance: SC Cleared (Required) - Must have active clearance

Contract Type: Day Rate Contract

Overview

We are seeking an experienced AWS Security Architect for my client to support the enhancement and optimisation of cloud security across a large-scale AWS environment. You will work closely with platform engineering teams to strengthen security controls, improve tooling, and ensure best practice adoption across the AWS estate.

Key Responsibilities

Design and implement secure AWS architectures aligned with industry best practicesCollaborate with platform engineering teams to embed security into cloud-native solutionsAssess and improve existing AWS security tools and controlsEnhance the organisation's cloud security posture through continuous improvement initiativesProvide architectural guidance on AWS-native security services and configurationsConduct security reviews, risk assessments, and recommend remediation strategiesSupport the development of secure-by-design principles across engineering teams

Key Skills & Experience

Strong experience as a Security Architect within AWS environmentsDeep knowledge of AWS native security tools, such as:IAM, GuardDuty, Security Hub, Config, CloudTrail, KMSExperience working with platform engineering or DevOps teamsProven ability to design and improve cloud security architectures and toolingStrong understanding of cloud security frameworks and best practices (e.g. CIS, NIST)Experience conducting security assessments and implementing improvements

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

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Splunk Security Specialist - Contract - Needed - 6 Months - London based - Financial services experience needed.

Build detections. Break threats. Level up SOCs.

We need Splunk Specialist to lead end‑to‑end Splunk ES engagements for enterprise clients. This is a delivery first contract role, designing detections, tuning alerts, and building dashboards that SOC teams actually use.

You'll sit inside a modern Security Practice covering MDR, Incident Response, Vulnerability Management, Pen Testing and Security Advisory, working on meaningful security problems - not BAU dashboard babysitting.

What You'll Do
* Design and deliver Splunk ES from requirements to production
* Build high-quality detections, correlation searches and risk-based alerting
* Write sharp SPL for threat detection and hunting
* Map detections to MITRE ATT&CK
* Onboard, normalise and enrich logs across Windows and Linux
* Create clear, operational dashboards for SOC teams
* Support automation and orchestration initiatives (SOAR exposure a plus)
* Use Python and PowerShell to automate and enrich workflows
* Work closely with SOC, IR and engineering teams
* Coach junior engineers when needed - no people management fluff

What We're After
* Strong hands-on Splunk Enterprise Security experience
* Proven delivery on complex, client-facing cyber projects
* Solid SOC knowledge (IAM, incident response, detection engineering)
* Sharp analytical mindset
* Confident stakeholder communication
* Eligibility to work in the UK

Nice to Have
* SOAR or UEBA experience
* Large-scale cyber or infrastructure programme experience
* Enjoys knowledge sharing and mentoring

Proper hands-on Splunk work
* High-impact projects
* Trusted delivery ownership
* Real influence on detection strategy

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

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Cloud Security Architect

Contract

Industry: Global FinTech Platform
Location: Hybrid (Amsterdam)
Contract Length: 6-12 months

About the Role

A leading FinTech provider is modernising its global cloud footprint and requires a Cloud Security Architect to design, implement, and govern cloud security standards across multi‑cloud estates. You will be the senior technical authority shaping how secure‑by‑design cloud services are built.

Key Responsibilities

Design secure architectures across AWS and Azure for high‑volume financial services.Define IaC security standards, encryption baselines, and identity patterns.Lead threat modelling, architectural risk assessments, and cloud posture reviews.Support engineering teams with secure build patterns, guardrails, and security automation.Act as a technical SME for cloud security governance and architectural boards.

Skills & Experience

Expert-level knowledge of AWS/Azure native security services.Strong Terraform, Kubernetes, container security, and CI/CD familiarity.Experience in regulated sectors (finance ideal).

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

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Role: Cloud Security Consultant - B2B

Duration: 6-month rolling contract

Working Pattern: Krakow, Hybrid (handful of days per month)

GCS Cyber are working with a global financial services organisation as they continue to strengthen and optimise their Cloud Cyber Security capability. This role focuses on driving cloud security maturity, automation, and governance, with a strong emphasis on Python‑based development alongside hands‑on cyber security expertise.

What you'll be doing:

Designing, developing, and enhancing cloud security solutions and automation using Python web frameworks (e.g. Flask, Django, FastAPI).Assessing and improving cloud security posture and maturity, including cloud security controls, baseline governance, and security scoring initiatives.

Must have:

Strong hands‑on experience securing cloud environments across one or more major cloud providers.Solid background in cyber security governance, including security controls, configuration baselines, and vulnerability assessment (e.g. CVSS).Proven track record delivering well written, well-structured web applications using (but not limited to) Flask, Django, FastAPI

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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Role: Cloud Security Consultant (Google Cloud)

Duration: 6-month rolling contract

Working Pattern: Krakow, Hybrid (handful of days per month)

GCS Cyber are partnered with a global financial services organisation undergoing multiple large-scale transformation programmes across their Cyber Security division, including scaling their cloud security capability. As part of a wider initiative to mature and scale cloud security engineering, we are looking for a Cloud Security Consultant to support security governance, controls, and compliance across Google Cloud environments.

What you'll be doing:

Reviewing and assessing security exception and risk acceptance requests from global business and technology teams, ensuring compliance with cloud security controls.Providing cloud security consultancy to engineering and application teams, supporting the secure design and transition of services into production.Enhancing and developing cloud security capabilities, including automation, governance, dashboards, and reporting.Supporting the assessment and application of Google Cloud security controls across a range of services.

Must have:

Hands‑on experience with Google Cloud Platform security.Strong understanding of cloud security principles, controls, and frameworks (e.g. CIS, NIST).Experience reviewing security controls, governance, or risk within cloud environments.Experience in Financial Services is an advantage

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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