Cyber Security Jobs

• Portugal - Field
• Hybrid · 3 days in office
• Senior

Builds and maintains iOS SDKs for document capture, working on camera capabilities, on-device image processing and machine learning to help end users prove their identity. Collaborates with designers, product managers and engineers in an agile team, using Swift and contributing to test automation and CI/CD pipelines.

iOS SDK · React Native · Flutter +3

• Portugal - Field
• Senior

Builds customer-facing web experiences in React alongside product designers and managers, prototyping and iterating across devices and browsers to meet accessibility standards. Contributes to test automation and GitLab CI/CD pipelines, and mentors other engineers on refactoring and engineering practices within an agile team.

React · GitLab

• 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

• Cambridge
• Hybrid · 2 days in office
• Senior

Lead strategic and hands-on UX research across multiple cybersecurity products, defining a cross-product research roadmap with UX, Product and Engineering leaders. Conduct qualitative and quantitative studies to inform platform unification, navigation and information architecture, translating findings into personas, journey maps and workflow models while scaling research practice.

• London
• £124,000 – £186,000 pa
• Senior

Owns architectural direction for Mimecast's Email & Collaboration Security product line, spanning email threat detection, DMARC, data platforms and response capabilities. Works across product, engineering and the Architecture Leadership Team to define integration contracts, ADRs and NFR targets, with cost-per-outcome reasoning and daily AI tooling use.

AWS · Kafka · MCP +4

• Milton Keynes
• Remote
• £12,000 – £150,000 pa
• Director · manages people

Lead a globally distributed engineering organisation spanning cyber security, backend development, sensor infrastructure and AI-driven vulnerability research. Set technical strategy and standards while providing hands-on direction across architecture, system design and code review, and drive adoption of AI, LLMs and autonomous workflows to accelerate vulnerability discovery and exploit analysis.

LLM

• Cambridge
• On-site
• £80,000 – £95,000 pa
• Senior
• Permanent

Owns software security strategy, roadmap and architecture across a product portfolio, leading threat modelling, secure design and security requirements. Defines secure architecture patterns and controls, embeds security into development and CI/CD, and oversees vulnerability management, security testing and release assurance while providing technical leadership to engineering teams.

Embedded Linux · Android · CI/CD

• Filton
• Hybrid
• £45,000 – £55,000 pa
• Senior

Join a defence and security organisation's Cyber Operations team to test security controls, validate SOC detection capabilities and uncover vulnerabilities before exploitation. You'll support Red Team exercises, conduct infrastructure and web application testing, produce risk reports and brief stakeholders, working alongside Threat Intelligence and Incident Response specialists.

Kali Linux · Parrot OS · Active Directory +7

• London
• Lead

Hands-on technical leadership role maintaining and evolving the Workday integration ecosystem across HR and Finance, reporting to the Digital Transformation Lead. You will design, build and support integrations using Workday Studio, EIB, web services and APIs, govern the Workday security model, and develop reporting and analytics. The role combines technical delivery with architecture, security, compliance and service management responsibilities.

Workday · Workday Studio · Enterprise Interface Builder +7

• 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

• London
• Hybrid
• £89,000 pa
• Senior

Architect secure, resilient network connectivity spanning AWS cloud platforms and on-premise infrastructure, supporting clinicians and researchers accessing sensitive genomic data. The role balances long-term network strategy with practical delivery, defining target architectures, standards and reusable patterns across cloud, hybrid, remote-access and partner connectivity. Involves designing AWS networking, hybrid multi-site connectivity, zero-trust security, and providing architectural governance through delivery.

AWS · Cisco · NVIDIA +7

• London
• Hybrid
• Mid-level

Builds new features and systems for Cloudflare's edge web server, focusing on the rules engine and its control plane. Works in Rust and Go on large-scale distributed systems, performance engineering, and reliability across a platform handling over 100 million HTTP requests per second.

Rust · Go · Cloudflare

• 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
• Mid-level
• Permanent

Detect and mitigate invalid traffic and ad fraud across Amazon's advertising network by reverse-engineering malware, inspecting network traffic and hunting threats, including on the dark web. The role blends security engineering, botnet mitigation and intelligence sharing with teams across Amazon, requiring creativity and judgement in a highly ambiguous fraud landscape.