Top Cyber Security Jobs in London

Lead and grow an EMEA SMB sales team of Account Executives. Responsibilities include coaching, hiring, pipeline generation, deal support, sales-process improvement, forecasting, performance management, and collaboration on go-to-market initiatives. The role is hands-on, requiring direct involvement in strategic deals and development of a high-performance sales culture. Candidates must be based in Ghent or London and have experience leading SaaS sales teams and managing Account Executives.

Lead and mature Mozilla's ISMS and compliance programs (ISO 27001 and SOC 2 Type 2). Manage SoA, risk treatment, audits, policy lifecycle, gap remediation, internal audits, and cross-functional control ownership while advising security leadership on certification readiness and compliance strategy.

Design, build, and operate Cloudflare application security systems, including rate limiting and web application firewall services. Lead complex technical projects, define scalable architectures, improve reliability, review code and designs, collaborate across engineering teams, and mentor other engineers. The role involves distributed systems, production monitoring, debugging, operational improvements, and occasional on-call support.

Own the full enterprise sales cycle across the UK, from prospecting and new-logo acquisition through negotiation and close. Manage complex, multi-stakeholder deals, deliver tailored demos and proof-of-value engagements, maintain Salesforce pipeline forecasts, and build trusted executive relationships. Collaborate with Marketing, Sales Engineering, Product, and Leadership while consistently exceeding quotas. The role also includes mentoring junior team members and applying structured sales methodologies.

Drives adoption, optimization, and customer success for Splunk’s security platform. Provides technical guidance on Enterprise Security and UBA use cases, configuration, and resilience; resolves complex challenges; collaborates with sales, support, and product teams; develops scalable processes and enablement materials; identifies expansion opportunities; and mentors team members. Requires substantial information security experience, Splunk certifications, SIEM expertise, security certifications, and proficiency across Unix, Windows, Bash, and Python.

Serves as a trusted security advisor and technical interface between Lightwell customers and Red Hat engineering teams. Guides customers on security patching, software supply chains, CI/CD, containerized deployments, artifact repositories, and secure development practices. Develops engagement plans, documents environments, resolves technical issues, mentors customer teams, contributes to knowledge bases, and creates solution patterns for enterprise adoption. Requires extensive software, security, DevOps, and customer advisory experience, with international travel as needed.

Lead security engineering across enterprise networks, devices, cloud systems, identity, and access environments. Design reusable security architectures, automated governance controls, authentication and authorization models, privileged access controls, secrets management, and policy-as-code. Diagnose and remediate security weaknesses, lead threat modeling, implement scalable controls for human and non-human identities including AI agents, and advise technology teams on complex security architecture decisions.

Secures Jane Street’s Windows and macOS platforms by deploying endpoint security controls, managing vulnerabilities, supporting incident response, and developing automation, playbooks, procedures, and standards. The role collaborates closely with IT, engineering, and operations teams to troubleshoot security and production issues, analyze logs and trends, and communicate security guidance across the firm.

Design, implement, test, and ship Firefox security and hardening features for enterprise users. Improve browser security architecture across operating systems, including privilege isolation, trust boundaries, cryptographic protocols, WebPKI, and security-sensitive web APIs. Investigate security issues, deliver maintainable fixes, and resolve stability, correctness, performance, memory, and multithreading challenges in a complex native codebase.

Secure Tide’s web, mobile, and cloud-native products through vulnerability hunting, threat modeling, secure design reviews, remediation, proof-of-concept scripting, and CI/CD security automation. The role serves as an Application Security subject matter expert, partners with engineering and product teams, communicates risks to executives, and mentors junior engineers.

Leads Jhpiego’s global security strategy, policies, risk mitigation, crisis and incident response, travel security, business continuity, investigations, training, and physical asset protection. Manages security vendors, intelligence networks, emergency response plans, executive travel safety, and global security personnel. Provides mentorship, cross-cultural leadership, and technical guidance across international programs, particularly in conflict-affected regions.

Designs and delivers cyber security and resilience training for UK education and research organisations. Responsibilities include developing training roadmaps, creating learning materials, facilitating workshops and presentations, and delivering practical exercises covering ransomware, incident response, crisis management, red teaming, and tabletop simulations. The role collaborates with subject matter experts and sector partners to improve cyber resilience and represents Jisc at relevant events.

Own the AI Surfaces product area end to end, setting product direction, prioritizing outcomes, defining success, and adapting strategy in a rapidly evolving market. Engage customers and prospects, including CISOs and CIOs, through sales calls and proof-of-value engagements. Collaborate with engineering, design, sales, and customer success while raising product management standards. Hands-on work includes exploring APIs, analyzing data, and testing solutions before committing development resources.

Owns Harmonic’s APIs, webhooks, MCP servers, and integrations as products. Responsibilities include prioritizing integrations, defining product strategy, collaborating with engineering, partnerships, sales, customers, and technical executives, evaluating API and authentication designs, testing integration flows, and producing clear technical specifications. The role also requires tracking AI-agent ecosystem developments and shaping the company’s integration strategy in a rapidly changing startup environment.

Build and maintain automated testing infrastructure across UI, browser extensions, endpoint agents, and backend services. Design cross-platform test environments, expand load testing, investigate bugs, integrate tests into GitLab CI/CD pipelines, establish quality gates, improve test reliability, and track coverage. Collaborate with engineers to resolve defects and shape the QA roadmap across Windows, macOS, and Linux.

Build production machine-learning features that transform raw AI usage data into customer-facing insights. Own classification, clustering, data pipelines, model deployment, evaluation frameworks, ground-truth datasets, error analysis, uncertainty quantification, and production reliability. Collaborate with customers, product, engineering, and security teams to shape insight experiences. Work primarily in Python across a polyglot Java, Spring Boot, and TypeScript stack deployed on AWS.

Design, develop, and maintain secure, high-quality production code and system architectures. Troubleshoot complex issues, analyze large datasets for improvements, ensure application resiliency and CI/CD practices, and contribute to engineering communities and inclusive team culture.

Analyze complex datasets, develop dashboards and reports, translate stakeholder requirements into data-driven solutions, and support analytical models and AI-enabled capabilities. The role involves collaborating with engineers and multidisciplinary Agile teams, ensuring data quality and documentation, presenting insights, and supporting UX/UI design within a secure Defence programme.

Supports application security tooling, vulnerability management, cloud security monitoring, secure design and API reviews, threat modeling, penetration-test triage, and engineering engagement. The role involves using tools such as Aikido and Prisma Cloud, reviewing code and CI/CD pipelines, maintaining security processes, and independently prioritizing security requests and remediation activities.

Design, implement, and maintain distributed software systems supporting Cloudflare’s application security products, including Rate Limiting and Web Application Firewall. Participate across the software development lifecycle, write automated tests, monitor production deployments, debug complex systems, review code, collaborate with security and infrastructure teams, and mentor colleagues. The role involves Rust and Go development, databases, Docker, Kubernetes, and maintaining reliable, fault-tolerant systems at scale, with possible on-call responsibilities.

Entry-level cybersecurity graduate role supporting breach triage, root-cause analysis, digital forensics, cybersecurity maturity assessments, threat intelligence, exposure assessments, client reporting, and post-breach remediation. The role also involves monitoring industry threats, contributing to thought leadership, improving service offerings, and working collaboratively with cybersecurity experts. Candidates should have a technical or investigative degree, strong analytical and communication skills, and an interest in cybersecurity.

Direct and marshal vehicles, manage loading bay and service-area access, monitor pedestrian and vehicle activity, conduct site safety checks, report incidents, and liaise with drivers, contractors, visitors, and site teams. Provide occasional Control Room cover by monitoring CCTV and responding to alarms and incidents. Maintain accurate records while following health and safety requirements, assignment instructions, and security procedures.

Own and support strategic B2B events across EMEA, including conferences, flagship events, executive programs, and trade shows. Responsibilities include end-to-end logistics, vendor coordination, budgets, project plans, registration, stakeholder collaboration, on-site execution, post-event reporting, ROI tracking, and regional event strategy. The role requires managing multiple concurrent events, coordinating cross-functional teams, and traveling extensively across EMEA with occasional APAC and AMER travel.

The Research Director will lead advanced AI security research focused on frontier AI safety, robustness, and architectures. The role involves shaping research priorities, pursuing high-impact research, collaborating with governments and leading AI companies, publishing externally, and translating technical findings into AI governance and deployment action. The position offers access to frontier models, significant compute, and collaboration across national security, policy, and AI research teams.

Provides flexible technical expertise across customer engagements, partnering with Customer Success Managers to investigate issues, optimize platform configurations, deliver best-practice guidance, document recommendations, identify expansion opportunities, and escalate complex situations. The role manages multiple short-term technical engagements across enterprise SaaS or cybersecurity customers and surfaces recurring patterns to Product, Engineering, and Customer Success.