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Application Security Engineer

ZZP / Freelance

Industry: AAA Gaming Studio
Location: Fully Remote (Netherlands)
Contract Length: 12-18 months

About the Role

A fast‑growing gaming studio is looking for an Application Security Engineer to embed secure development practices into their high‑velocity game and platform engineering teams. You'll help secure game engines, back‑end services, and player‑facing APIs used by millions worldwide.

Key Responsibilities

Conduct secure code reviews and help dev teams fix vulnerabilities.Integrate SAST, SCA, and DAST tools into build pipelines.Perform threat modelling on gameplay features and backend microservices.Respond to application‑level vulnerabilities and guide remediation efforts.Promote a developer‑friendly security culture within the studio.

Skills & Experience

Strong experience with modern languages (C++, C#, Go, Python).Solid understanding of CI/CD security and cloud-native app security.Gaming sector experience is a bonus, not a requirement.

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

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IAM Programme Manager

Contract

Industry: Global Healthcare Group
Location: Remote with travel to Netherlands
Contract Length: 12-18 months

About the Role

A global healthcare provider is launching a far‑reaching identity transformation. They require an experienced IAM Programme Manager to lead multiple workstreams spanning workforce identity, privileged access, lifecycle automation, and compliance uplift.

Key Responsibilities

Own the IAM programme roadmap, scope, budget, and stakeholder governance.Oversee delivery of projects including PAM enhancements, MFA rollout, SSO migration, and onboarding automation.Liaise with clinical, compliance, and IT teams to ensure identity solutions integrate with operational workflows.Manage vendor relationships and technical delivery partners.Provide reporting, risk tracking, and programme governance to senior leadership.

Skills & Experience

Proven track record running multi‑stream IAM programmes.Experience with stacks such as SailPoint, Okta, CyberArk, and Azure AD.Background in regulated environments (healthcare, pharma, government) preferred.

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

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Cyber Threat Intelligence Lead

Contract

Industry: National Transport & Infrastructure
Location: Hybrid (The Hague)
Contract Length: 12 months

About the Role

A major transport infrastructure organisation is expanding its national cyber defence capability and seeks a Cyber Threat Intelligence Lead to build its CTI function from the ground up. You will provide strategic and operational intelligence across both IT and OT environments.

Key Responsibilities

Establish and lead the organisation's threat intelligence programme.Monitor, analyse, and disseminate intelligence on campaigns targeting OT and transport systems.Collaborate with government partners and private sector information‑sharing groups.Feed intelligence into SOC, IR, and vulnerability management functions.Produce high‑quality threat reports for executive and operational teams.

Skills & Experience

Strong experience in CTI roles with OT or critical infrastructure exposure.Proficiency with MITRE ATT&CK, Diamond Model, malware analysis fundamentals, and OSINT.Ability to translate intelligence into actionable defensive measures.

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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Network Security Engineer

Contract

Location: Remote / Hybrid (Amsterdam)

Contract Length: 6-12 months
Start Date: ASAP
Rate: Competitive

About the Role

Our client, a leading gaming company, is seeking an experienced Network Security Engineer Contractor to support a large-scale merger and acquisition integration. The organisation has recently acquired a studio with a significantly different technology estate, and now requires a specialist to help consolidate, secure, and stabilise the combined network infrastructure.

This role is critical in ensuring the security, interoperability, and reliability of both legacy and acquired networks during the integration phase.

Key Responsibilities

Network Security Integration & Hardening

Assess, analyse, and map the acquired company's network and security architecture.Identify vulnerabilities, configuration drift, and conflicting standards across environments.Design and implement secure network integration strategies that align with corporate policies and gaming industry best practices.Strengthen perimeter security, segmentation, and internal traffic controls to ensure a stable post‑M&A environment.

Infrastructure Consolidation & Modernisation

Lead the integration of disparate firewalls, VPNs, proxies, and network monitoring tooling.Support migration of security controls, policies, and configurations into the parent company's environment.Advise on standardisation of network technologies and tooling across both estates.

Operational Security Support

Respond to and investigate network security incidents throughout the integration period.Optimise logging, SIEM visibility, alerting configurations, and incident response workflows.Provide expert-level troubleshooting of complex network and security issues, especially those arising from inter-environment connectivity.

Documentation & Knowledge Transfer

Produce clear, detailed documentation of new network security architectures, configurations, and procedures.Provide knowledge transfer to in‑house infrastructure and security teams.Support creation of new unified network and security standards for the combined organisation.

Technical Skills & Experience

Essential

7+ years' experience in network security engineering within complex, multi‑site environments.Strong hands-on expertise with:Next‑generation firewalls (e.g., Palo Alto, Fortinet, Check Point)VPN technologies (IPSec, SSL VPN, Zero Trust solutions)Network segmentation and micro‑segmentationLoad balancers and web application firewallsIDS/IPS platformsProven experience of M&A network integration or multi‑environment consolidation.Deep understanding of TCP/IP, routing protocols, BGP/OSPF, DNS, DHCP, and network diagnostics.Experience with SIEM, log management, and security monitoring platforms.Comfortable with both traditional on‑prem networks and cloud-connected environments (AWS, Azure, GCP).

Desirable

Experience working in a gaming, media, or high‑performance computing environment.Familiarity with DevSecOps, automation, or infrastructure‑as‑code (Terraform, Ansible).Certifications such as CISSP, CCNP Security, PCNSE, or similar.

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

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🚀 Senior Data Scientist | Ecommerce | Product Analytics & Machine Learning

What if your next role allowed you to shape the digital experience of millions of users through advanced analytics, experimentation, and machine learning?

We're working with a global consumer-focused business undergoing a major digital transformation, and they're looking for a Senior Data Scientist to join their Ecommerce & Digital Analytics team.

This is a highly product-oriented role where data science goes far beyond reporting. You'll help build intelligent, data-powered experiences that directly influence customer journeys, personalization, conversion, and business performance at scale.

🔹 What you'll be doing:
* Building predictive and prescriptive analytics solutions for ecommerce and customer experience optimization
* Developing machine learning models and advanced analytics use cases from discovery through to deployment and monitoring
* Identifying trends, behaviors, and high-impact opportunities through deep data exploration
* Designing and analyzing A/B tests and experimentation frameworks to drive product decisions
* Partnering closely with Product Managers, Engineers, Analysts, and business stakeholders to deliver scalable solutions in production
* Translating complex datasets into actionable insights that influence strategy and measurable outcomes

🔹 Tech environment:
Python | SQL | Spark / PySpark | Databricks | AWS | GCP

🔹 What we're looking for:
* Strong experience delivering end-to-end data science projects in product-focused environments
* Expertise in experimentation, statistical analysis, predictive modeling, and machine learning
* Proven experience working with large-scale datasets and modern data platforms
* Ability to combine technical depth with strong business understanding
* Excellent communication and stakeholder management skills

🔹 Why join?
✔ Work on data products used at global scale
✔ Highly collaborative product and engineering culture
✔ Opportunity to influence customer experience through innovation and experimentation
✔ Fast-moving, international environment focused on continuous optimization and impact

If you enjoy turning complex data into intelligent product experiences with measurable business impact, please apply through our portal

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

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🚀 Senior Data Scientist | Ecommerce | Product Analytics & Machine Learning

What if your next role allowed you to shape the digital experience of millions of users through advanced analytics, experimentation, and machine learning?

We're working with a global consumer-focused business undergoing a major digital transformation, and they're looking for a Senior Data Scientist to join their Ecommerce & Digital Analytics team.

This is a highly product-oriented role where data science goes far beyond reporting. You'll help build intelligent, data-powered experiences that directly influence customer journeys, personalization, conversion, and business performance at scale.

🔹 What you'll be doing:
* Building predictive and prescriptive analytics solutions for ecommerce and customer experience optimization
* Developing machine learning models and advanced analytics use cases from discovery through to deployment and monitoring
* Identifying trends, behaviors, and high-impact opportunities through deep data exploration
* Designing and analyzing A/B tests and experimentation frameworks to drive product decisions
* Partnering closely with Product Managers, Engineers, Analysts, and business stakeholders to deliver scalable solutions in production
* Translating complex datasets into actionable insights that influence strategy and measurable outcomes

🔹 Tech environment:
Python | SQL | Spark / PySpark | Databricks | AWS | GCP

🔹 What we're looking for:
* Strong experience delivering end-to-end data science projects in product-focused environments
* Expertise in experimentation, statistical analysis, predictive modeling, and machine learning
* Proven experience working with large-scale datasets and modern data platforms
* Ability to combine technical depth with strong business understanding
* Excellent communication and stakeholder management skills

🔹 Why join?
✔ Work on data products used at global scale
✔ Highly collaborative product and engineering culture
✔ Opportunity to influence customer experience through innovation and experimentation
✔ Fast-moving, international environment focused on continuous optimization and impact

If you enjoy turning complex data into intelligent product experiences with measurable business impact, please apply through our portal

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

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I am looking for a Senior Data Platform with experience in Azure and Databricks for a client of mine based in Amsterdam.

6 months contract with the option to extend.

Netherlands based candidates only and this is a freelance/zzp role.

For further information please apply or reach out to me on [email protected]

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

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My client is looking for an experienced AI Fullstack Engineer to join their team on an initial 6 month contract role

This will be an inside ir35 Project with the requirement of being in their Farringdon office 1 day a week

Experience building Python backend services and APIs alongside React/TypeScript frontends whilst taking ownership for end‑to‑end deliveryExperience with Agentic LLM platforms to include designing and implementing multi‑agent systemsGood RAG experience

This is an urgent contract role. 1 stage interview process

Please feel free to share your CV directly if interested [email protected]

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

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