Cyber Security Jobs

• United Kingdom - Field
• Senior

Designs, builds, tests and operates significant capabilities of the Agentic Trust solution within R&D, delivering complex features across the full software development lifecycle. Develops secure APIs, services, integrations and SDKs, mentors less experienced developers, and troubleshoots production issues. Works with Product, Architecture and Security peers to keep the platform secure, scalable and reliable.

Kubernetes · MCP · LLM

• Ireland
• Remote
• Senior
• Permanent

Owns major components of the Windows kernel-mode sensor, architecting and building next-generation anti-virus and EDR security software. Works across core OS subsystems like file system, memory, process and networking, with cross-platform deliverables for Windows, Mac and Linux. Leads projects end to end, mentoring and collaborating with distributed teams.

Windows · Mac · Linux +2

• United Kingdom
• Remote
• Senior
• Permanent

Owns major components of the Windows kernel-mode endpoint sensor, architecting and building anti-virus and EDR features that span file system, memory, process and networking subsystems. Leads projects from design to delivery, mentors engineers and collaborates with distributed, cross-platform teams on shared Windows, Mac and Linux components.

Windows · Mac · Linux +1

• London
• Senior

Builds and operates Cloudflare's Chromium-based browser isolation engine, working across C++, Rust, Go and TypeScript on remote rendering, streaming and distributed session services. The role spans systems programming, distributed systems and security, leading multi-component initiatives and on-call incident response.

Chromium · Cloudflare Workers · Nomad +3

• London
• €66,000 – €91,000 pa
• Senior

Builds and operates microservices behind Cloudflare's Application Security products such as Rate Limiting and Web Application Firewall, working mainly in Rust and Go with Docker, Kubernetes, PostgreSQL, Kafka and Clickhouse. Senior engineers lead complex projects from design through production, mentor peers, and improve reliability of distributed systems at global scale, with on-call flexibility required.

Rust · Go · C++ +7

• London
• Remote
• Mid-level

As a Solutions Consultant in the Defence and Intelligence team, you translate complex cybersecurity solutions into strategic business value for defence clients, acting as the evolution of the traditional sales engineering role. You provide technical leadership across on-prem, cloud and security operations, running discovery, demos, workshops and technical validation to secure the technical win. The role requires deep Defence sector experience and work with Defence Systems Integrators.

Palo Alto Networks · SASE · SaaS +2

• Cambridge
• Hybrid
• Senior
• Permanent

Designs, implements and maintains AWS cloud infrastructure supporting microservices-based applications, with heavy focus on EKS, Kubernetes and Terraform/OpenTofu IaC. Also covers service mesh (ISTIO), CI/CD with Jenkins, Splunk and Datadog monitoring, and day-2 operations such as upgrades, backup/restore and cost optimisation.

AWS · EKS · Kubernetes +7

• United Kingdom
• Remote
• Lead

Deliver white-glove onboarding and ongoing technical guidance for Managed XSIAM customers, analysing security data to improve detection coverage, alert quality and tenant hygiene. Lead customer touchpoints and security reviews while partnering with Unit 42 SOC engineering, Product and MDR teams to build automation workflows and scalable service frameworks.

XSIAM · Unit 42

• Harrow
• Hybrid
• Senior
• Permanent

Hands-on architect role at an Elastic partner, designing SOC and SIEM architectures on Elastic/ELK for UK Defence and NATO clients. You own the architecture with the client and stay close to delivery, supporting greenfield builds and recovering existing environments alongside a team of 30+ SMEs, mostly working remotely with occasional client-site visits.

Elastic · ELK · Elasticsearch +4

• Bristol
• £50,000 – £80,000 pa
• Senior

Designs secure network and infrastructure architectures and delivers security assurance and accreditation artefacts for central government and public sector clients. Works across the full systems lifecycle with delivery teams and engineers, assessing environments against CAF, NIST, Cyber Essentials and SbD. Requires TOGAF certification and SC clearance eligibility.

TOGAF · JSP 440 · JSP 604

• London
• Remote
• £600 – £720 pd
• Senior · manages people
• Contract

Lead the design and governance of secure, scalable AWS cloud architectures for a public sector client, driving migration, modernisation and Infrastructure as Code with Terraform, CloudFormation or CDK. The role combines technical leadership and architectural assurance with stakeholder engagement, security compliance and cost, performance and resilience optimisation.

AWS · Terraform · CloudFormation +1

• Cambridge
• On-site
• £80,000 – £100,000 pa
• Senior
• Permanent

Owns software security strategy, architecture and standards across a diverse product portfolio, embedding threat modelling and secure-by-design into the full lifecycle. Works with engineering and product teams on architecture reviews, vulnerability management, CI/CD security and release criteria, plus EU Cyber Resilience Act compliance. Desirable background includes embedded systems, IoT, Android and embedded Linux.

Android · Embedded Linux

• United Kingdom
• Remote
• £80,000 – £90,000 pa
• Senior

Designs and reviews security architectures across cyber, cloud and enterprise environments for defence customers, acting as a trusted technical adviser. Develops secure AWS or Azure cloud architectures, produces assurance documentation and designs, and travels to customer sites to engage stakeholders. Requires live SC clearance and CISSP, with a genuine voice in shaping the consultancy's security offering.

AWS · Azure

• West Byfleet
• Senior

Hands-on architecture role shaping AWS cloud strategies, standards and governance for secure, business-critical environments. You will design resilient, highly available solutions, lead infrastructure automation and migration projects, and provide technical leadership to engineering teams while engaging directly with customers. Distinct for its focus on Defence, National Security and Public Sector work requiring existing DV clearance.

AWS · EC2 · S3 +7

• Dublin, Ireland
• £431 – £604 pd
• Senior
• Contract

Contract role ensuring reliability and operational excellence for Azure platform services under a product operating model. Day to day involves observability, incident response, automation, resilience testing and runbook development for Azure landing zones, ingress/egress DMZs, service integration layers and AI infrastructure supporting Microsoft Foundry and private OpenAI access. Works closely with platform engineering, networking, security and AI infrastructure teams to embed reliability into Azure-native solutions.

Azure · Microsoft Foundry · OpenAI