Jobs in London

Professional Services Red Team Intern - Summer 2027 , GBR)

A 12-week summer internship focused on red teaming, where you shadow live engagements, run a simulated red team exercise against a lab environment, and build a tooling or process-improvement project with the development team. Fully remote, with interns expected near London, Reading or Edinburgh for social events.

CrowdStrike Reading

Remote Internship Clearance Required

Incident Response - Professional Services - Summer 2027 , UK)

A 12-week summer internship focused on incident response within CrowdStrike's professional services division. Interns complete a dedicated incident response course covering host and cloud forensics, large-scale log analysis, red teaming and strategic consulting, then run a mock engagement end to end. Fully remote, with interns expected near London, Reading or Edinburgh for social events.

CrowdStrike United Kingdom

Remote Internship Clearance Required

Senior Product Manager, Email Security

Owns the strategic roadmap for Cloudflare's Email Security product, driving differentiation against legacy incumbents and integrating with the Zero Trust stack (Gateway, CASB, DLP). Works closely with Threat Intelligence and Detections teams, engages customers directly, and evangelizes the platform internally and externally.

Cloudflare London €68,000 – €94,000 pa

Senior Systems Engineer - Application Security

Design, build and operate distributed systems behind Cloudflare's Application Security products (WAF, Page Shield, API Shield) at internet scale, using Go or Rust and devops tooling like Kubernetes and Kafka. The role includes reviewing RFCs and code, on-call shifts, and mentoring other engineers.

Cloudflare London

Hybrid

Senior Security Researcher

Contributes to security research projects spanning rapid prototyping and open-ended initiatives, with a focus on generative AI systems. Investigates attacker tradecraft such as prompt injection, poisoning and extraction attacks, and provides feedback to product, development and machine learning teams. Hybrid role requiring two days a week in the London or Cambridge office.

Darktrace Cambridge

Hybrid

Senior Security Researcher

Contributes to projects spanning rapid prototyping and open-ended research into generative AI security, investigating attacker tradecraft such as prompt injection, poisoning and extraction attacks. Acts as a domain expert, feeding insights back to product, development and machine learning teams, with coverage in network, endpoint, cloud or Kubernetes.

Darktrace London

Hybrid

Professional Services Red Team Intern - Summer 2027 , GBR)

A 12-week summer internship focused on red teaming, shadowing live engagements and running a mock red team exercise against a lab environment to find vulnerabilities. Interns also work with the development team on a tooling or process improvement project, presenting findings to mentors in simulated client interactions.

CrowdStrike United Kingdom

Remote Internship Clearance Required

Sr. Product Manager - Next-Gen SIEM

Owns the global product vision and multi-year strategy for CrowdStrike's Falcon Next-Gen SIEM platform, prioritising third-party data connectors and integration pipelines based on market research and customer demand. Works across engineering, data services, sales ops and partners to define ingestion SLOs, mentor product managers and expand the SIEM ecosystem.

CrowdStrike London

Hybrid

Senior Software Engineer (Python)

Owns prototyping and development of new ideas to improve Darktrace's cybersecurity services, balancing creativity with time constraints. Collaborates with a cross-functional team of engineers, designers and technical strategists on rapid prototyping and structured platform development, advancing methods for defending against unknown cyber-attacks. Requires production-quality Python coding, with Docker and containerisation experience and an interest in malware forensics.

Darktrace Cambridge

Hybrid

Senior Engineering Manager - Cloudforce One

Lead the Threat Application Services team within Cloudforce One, owning the Threat Events platform, external Threat Intel APIs, and backend systems that feed IOCs into WAF and Gateway for automated mitigation. Set architectural direction and operational excellence for distributed, high-latency-sensitive services, while hiring and mentoring engineers building agentic threat intelligence tools.

Cloudflare London

Senior Systems Engineer, Browser Isolation

Builds and operates a Chromium-based browser isolation platform, working across C++, Rust, Go and TypeScript on remote rendering, WebRTC streaming and distributed session orchestration. Leads multi-component initiatives from design through staged rollout, diagnosing cross-layer failures and improving resilience and observability, with production on-call duties.

Cloudflare London

Principal Data Scientist, Detection

Lead research, design and evaluation of detection models identifying automated, fraudulent and malicious activity across Internet-scale traffic. Own the detection measurement framework for noisy or delayed ground truth, mentor others, and drive cross-functional detection strategy with ML, data and product teams.

Cloudflare London US$215,000 – US$225,000 pa

Principal Product Manager, Certificate Authority

Owns product strategy, roadmap and commercial model for a new publicly trusted certificate authority, spanning ACME issuance, certificate lifecycle automation, revocation and Certificate Transparency. Works across engineering, compliance, legal and go-to-market on high-consequence infrastructure, with an ACME-first, automation-first and post-quantum-ready design.

Cloudflare London