About Us At Cloudflare, we are on a mission to help build a better Internet. Today the company runs one of the world's largest networks that powers millions of websites and other Internet properties for customers ranging from individual bloggers to SMBs to Fortune 500 companies. Cloudflare protects and accelerates any Internet application online without adding hardware, installing software, or changing a line of code. Internet properties powered by Cloudflare all have web traffic routed through its intelligent global network, which gets smarter with every request. As a result, they see significant improvement in performance and a decrease in spam and other attacks. Cloudflare was named to Entrepreneur Magazine's Top Company Cultures list and ranked among the World's Most Innovative Companies by Fast Company.
About Us At Cloudflare, we are on a mission to help build a better Internet. Today the company runs one of the world's largest networks that powers millions of websites and other Internet properties for customers ranging from individual bloggers to SMBs to Fortune 500 companies. Cloudflare protects and accelerates any Internet application online without adding hardware, installing software, or changing a line of code. Internet properties powered by Cloudflare all have web traffic routed through its intelligent global network, which gets smarter with every request. As a result, they see significant improvement in performance and a decrease in spam and other attacks. Cloudflare was named to Entrepreneur Magazine's Top Company Cultures list and ranked among the World's Most Innovative Companies by Fast Company.
Available Locations: London, United Kingdom About The Department Cloudforce One is Cloudflare's threat operations and research team, responsible for identifying and disrupting cyber threats ranging from sophisticated cyber criminal activity to nation-state sponsored advanced persistent threats (APTs). Cloudforce One works in close partnership with external organizations and internal Cloudflare teams, continuously developing operational tradecraft and expanding ever-growing sources of threat intelligence to enable expedited threat hunting and remediation.
Members of Cloudforce One are at the helm of leveraging an incredibly vast and varied set of data points that only one of the world's largest global networks can provide. The team analyzes these unique data points at massive scale and efficiency, synthesizing findings into actionable threat intelligence to better protect our customers.
About INTERDICT I.N.T.E.R.D.I.C.T. (Identify, Neutralize, Triage, Engage, Respond, Disrupt, Integrate, Contain, Threat Hunting) is Cloudforce One's unified operational security organization responsible for identifying, analyzing, and responding to threats targeting Cloudflare and its customers. INTERDICT encompasses three main sub-functions:
- PhishGuard: Email Managed Detection and Response (MDR) service.
- Cloudflare Managed Defense (CMD): 24/7 monitoring, detection, and mitigation of security events across Cloudflare products.
- Detection Engineering: Develops, maintains, and deploys Cloudflare's threat detection logic across email, application, and network telemetry.
Through the combined capabilities of CMD, PhishGuard, and Detection Engineering, INTERDICT delivers a cohesive operational security function that provides continuous, proactive protection against network, application, and email-based threats. This integrated structure ensures rapid detection, coordinated response, and improved security outcomes for Cloudflare and its customers.
About The Role Senior Response Engineer (Network Security focused) within the Cloudflare Managed Defense Center (CMDC) serves as a core technical specialist within the proactive security team. This position is built for a network security practitioner who thrives at the intersection of deep routing protocol investigation, edge-network defense, and strategic technical partnership. The role is responsible for architecting responses to sophisticated infrastructure threats across OSI Layers 3, 4, and 7, ensuring global customers remain resilient against large-scale volumetric DDoS attacks and complex network-layer anomalies.
What You'll Do Acting as a primary technical anchor for network defense, you will provide advanced assistance and strategic intelligence across Cloudflare's most sophisticated customer environments. This involves deep mastery of infrastructure protection components (spanning Cloudflare's native services or industry equivalent solutions), including BGP routing and advertisement control (managing prefix advertisement and de advertisement), network protection like Magic Transit, IPFLOW based Magic Network Monitoring, Advanced TCP/UDP protection, DDoS mitigation rulesets, firewall configurations, Layer 4 proxies such as Spectrum, DNS Firewall, and connectivity troubleshooting over GRE, IPsec, and CNI. A working knowledge of application security (including CDN technology and Web Application Firewalls) will allow you to extend support across broader Managed Defense activities.
- Technical Mentorship: Elevating the team's collective skill set by acting as a "player coach" providing hands on technical guidance during live incidents and reviewing complex mitigation strategies.
- Deep Dive Investigation & Mitigation: Analyzing infrastructure threats using advanced internal telemetry to engineer informed mitigation strategies-specifically focusing on DDoS vectors, BGP routing anomalies, and GRE encapsulation issues-implementing defenses directly on the edge for mission critical traffic.
- Detection Engineering & Tuning: Continuously designing and refining detection mechanisms, security controls, and alerting thresholds to ensure highly accurate, rapid identification of sophisticated network attacks with minimal false positives.
- Infrastructure & Tooling Evolution (AI Driven): Partnering closely with Product, Engineering, and AI teams to transform real world DDoS attack data into AI powered automated network defenses, dynamic mitigation models, and enhanced platform capabilities.
- Strategic Technical Communication: Serving as an authoritative technical voice during active volumetric attacks, providing clarity and architectural routing guidance to both internal stakeholders and external customer engineering teams.
Responsibilities
- Technical Escalation & Response: Acting as a subject matter expert for the Managed Defense Center during complex network security incidents, providing hands on intervention for large-scale volumetric and protocol based DDoS attacks when standard protocols are exceeded.
- Incident Architecture: Leading the technical response to sophisticated infrastructure threats, validating the efficacy of network mitigation rules, and ensuring stable, clean traffic delivery via BGP and GRE mechanisms.
- Detection Engineering: Designing, deploying, and tuning network attack detection logic, utilizing attack telemetry to stay consistently ahead of evolving DDoS methodologies and adversary tactics.
- Technical Communications: Driving high touch technical dialogue with customer network teams during critical incidents, translating complex routing and attack flow data into actionable architectural advice.
- Operational Engineering & AI Integration: Designing and refining technical Managed Defense workflows, building AI driven automated troubleshooting playbooks (particularly around BGP/GRE), and tuning alerting thresholds to create self healing infrastructure responses.
- Forensics & Analysis: Utilizing internal telemetry, flow data, and specialized monitoring tools to perform deep dive forensics on novel network attack vectors.
- Technical Coaching: Mentoring the Managed Defense team on advanced traffic analysis and security best practices, ensuring a high technical bar across the Managed Defense Center.
Desirable Skills, Knowledge, and Experience:
- Experience: A minimum of 8+ years of relevant hands on experience specifically within the DDoS mitigation industry, Network Security Operations, or a highly technical infrastructure incident response environment.
- Protocol Sovereignty: A profound understanding of internet routing and encapsulation protocols. Expert level knowledge of BGP (Border Gateway Protocol) and GRE (Generic Routing Encapsulation) reinjection, along with a deep ability to deconstruct TCP/IP, UDP, and ICMP traffic flows.
- Security Mastery: Proven ability to identify common network attacks and design robust mitigation strategies for complex volumetric DDoS, UDP/TCP based, and protocol exhaustion using edge based security controls.
- Detection & Tuning: Demonstrated expertise in detection engineering, including the continuous tuning of network security rules and alerts to optimize defense efficacy and operational signal to noise ratios.
- AI Tooling & Automation: Proficiency in Python, Go, or Bash to automate network security workflows, with demonstrated experience leveraging AI/ML models or LLM APIs to build automated troubleshooting diagnostics and dynamic threat mitigations.
- System Literacy: Experience with monitoring platforms (e.g., Prometheus/Grafana) and querying large network datasets to operationalize contextual routing and security data.
- Certifications: Advanced networking and network security credentials such as Cisco CCNP, CCNP Security, or CCIE are highly valued.
What Makes Cloudflare Special? We're not just a highly ambitious, large scale technology company. We're a highly ambitious, large scale technology company with a soul . click apply for full job details