Senior Response Engineer - Cloudflare Managed Defense Center (CMDC)

Available Location: Singapore

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:

• Cloudflare Managed Defense (CMD): Network and application security monitoring for 'Under Attack' mitigation support.
• PhishGuard: Managed email threat detection and response service.
• Detection Engineering: ML model development and detection optimization.

Together, INTERDICT provides comprehensive 24×7×365 protection across email, application, and network threat surfaces.

Role Summary

As a Senior Response Engineer within the Cloudflare Managed Defense Center (CMDC), you will serve as a subject-matter expert and technical escalation point for threat mitigation across Cloudflare’s strategic enterprise customer base. In this role, you will lead the response to sophisticated, multi-vector cyberattacks spanning OSI Layers 3, 4, and 7, operating beyond standard playbooks to diagnose anomalies, engineer custom mitigations, and stabilize mission-critical infrastructure under fire.

Beyond active incident command, you will act as a force multiplier: architecting customer-specific defense strategies, authoring and refining automated detection logic, mentoring Tier 1 and Tier 2 engineers, and collaborating directly with Cloudflare Product and Engineering teams. We are looking for an experienced, high-ownership technical leader who excels during high-stakes incidents and is passionate about mentoring others while advancing threat mitigation at scale.

CMDC operates 24×7×365. This role participates in a regional shift rotation and on-call escalation rota including periodic weekend and public-holiday coverage as part of a follow-the-sun model across AMER, EMEA, and APAC.

Role Responsibilities

• Act as the technical lead and incident commander during high-impact, multi-vector security events, designing and deploying bespoke mitigation strategies when standard runbooks do not suffice.
• Perform deep-dive forensic analysis into complex Layer 3/4 and Layer 7 traffic anomalies, identifying zero-day attack patterns, sophisticated bot networks, and novel evasion techniques.
• Apply advanced mitigation strategies and filter malicious traffic using Cloudflare’s core security suite, including Magic Transit, Web Application Firewall (WAF), and Advanced Rate Limiting.
• Lead technical communications and incident bridge calls with enterprise C-level executives, principal network engineers, and security teams during critical events, clearly articulating root causes, impact assessments, and remediation paths.
• Monitor and investigate proactive security alerts across internal telemetry systems to rapidly triage incoming events, assess blast radius, and validate threat severity.
• Adhere to and champion strict customer SLAs for alert response times, event analysis, and clear executive reporting.
• Mentor and elevate Tier 1 and Tier 2 engineers through structured shadowing, technical post-mortems, and internal training.
• Partner with internal Engineering and Product teams to translate operational attack trends into prioritized platform enhancements, tool feedback, and automated detection logic.

Role Requirements (Must-Have Skills)

• A minimum of 6–8 years of hands-on experience in a high-volume Security Operations Center (SOC), Managed Detection and Response (MDR), network engineering, or incident response environment dealing directly with live threat mitigation.
• Comprehensive knowledge of networking principles and internet infrastructure, including TCP/IP, UDP, ICMP, DNS, BGP routing mechanics, and edge network design.
• Deep expertise in Layer 7 protocols and web architectures (HTTP/1.1, HTTP/2, HTTP/3, TLS handshakes/ciphers, reverse proxy models, and API security).
• Experience analyzing network traffic data for anomaly detection and designing, tuning, and executing advanced mitigation strategies against L3/L4 and L7 attacks, including bespoke countermeasures when standard playbooks are insufficient.
• Advanced proficiency in packet capture and network traffic analysis using tools such as tcpdump, Wireshark, or tshark to isolate anomalies and dissect malformed or novel payloads.
• Practical experience analyzing and mitigating security incidents using AI and machine learning tools, paired with the hands-on capability to build and integrate custom tooling that improves operational workflows, accelerates log telemetry analysis, and defends against AI-driven botnets and adversarial edge attacks.
• Proficiency in using the command line (Bash shell) alongside general system administration literacy across Linux, Mac, or Windows environments.
• Proven experience commanding incident bridges, making decisive risk-tradeoff decisions, and maintaining composure while managing enterprise stakeholders during high-pressure crises.

Nice-to-Have Skills

• Direct experience querying large-scale distributed logging and analytics systems using SQL, GraphQL, ClickHouse, or SIEM platforms (Splunk, Elastic, Sumo Logic).
• Hands-on experience defending against advanced persistent threats (APTs), credential stuffing, scraping botnets, or application-layer bypass attacks against major CDNs/WAFs.
• Relevant industry certifications, such as CISSP, CCNP/CCIE, or advanced GIAC credentials (e.g., GCIA, GCIH, GNFA).