Principal Engineer: Threat Intelligence & AI-Driven Security

Cloudflare; Greater London; On-site; GBP 150,000 - 200,000; Full time

Benefits offered by this job

Equity in Cloudflare

Comprehensive health plan

401(k) retirement savings

Paid time off

Job summary

Cloudflare is seeking a Principal Engineer to lead threat operations and research, shaping architectural direction across the global network. You will design scalable pipelines, mentor teams, and drive AI-assisted workflows to accelerate threat hunting and abuse mitigation.

The role demands security leadership across multiple projects and on-call responsibilities. The ideal candidate has extensive experience in distributed systems, threat intelligence, and hands-on Go/TypeScript expertise, with

Qualifications

• 15+ years of cyber security experience with an emphasis on building systems to present adversarial trends and techniques.
• 10+ years of experience building and operating large-scale distributed systems in production.
• Deep hands-on proficiency in Go and/or TypeScript with production experience deploying services in Kubernetes and edge computing platforms.

Responsibilities

• Drive architectural direction and technical strategy across Cloudforce One engineering, spanning services that run in Kubernetes, on the edge (Workers, D1), and across Cloudflare's global network.
• Identify and dismantle technical bottlenecks, legacy patterns, and architectural debt that slow threat detection and abuse response.
• Design and build critical data pipelines and services to collect, enrich, analyze, and expose threat intelligence and abuse signals at massive scale.
• Serve as a technical force multiplier across multiple concurrent projects and cross-functional teams.
• Bring a threat-informed perspective to engineering decisions and build systems that stay ahead of evolving attack techniques.
• Collaborate with Threat Intelligence researchers, Trust & Safety analysts, Product, Legal, and other engineering teams to translate complex security requirements into scalable solutions.
• Mentor and elevate the engineering talent — set the bar for code quality and security-first thinking.
• Develop and champion agentic AI workflows and AI-assisted development practices.

Skills

Cyber security

Distributed systems

Go

TypeScript

Kubernetes

PostgreSQL

Redis

Kafka/Temporal

AI workflows

Security architecture

Tools

Kubernetes

PostgreSQL

Redis

Kafka

Temporal

Terraform

React

Cloudflare Workers

Job description

Cloudflare is seeking a Principal Engineer to lead threat operations and research, shaping architectural direction across the global network. You will design scalable pipelines, mentor teams, and drive AI-assisted workflows to accelerate threat hunting and abuse mitigation.

The role demands security leadership across multiple projects and on-call responsibilities. The ideal candidate has extensive experience in distributed systems, threat intelligence, and hands-on Go/TypeScript expertise, with