Hunt and neutralize BEC and phishing campaigns inside Cloudflare's PhishGuard managed email defense

This role sits inside Cloudflare's Cloudforce One / INTERDICT threat operations org, acting as the human intelligence layer that catches sophisticated email-borne attacks automated systems miss. You'll investigate flagged and customer-reported emails, hunt proactively for emerging BEC and vendor-fraud patterns, feed findings back into Detection Engineering's ML models, and guide customers through DMARC hardening. Expect deep questions on SPF/DKIM/DMARC mechanics, phishing/BEC investigation workflow, and how you'd use AI/LLM tooling in daily triage.

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What this interview tests

BEC / vendor fraud investigation methodology
SPF/DKIM/DMARC protocol depth and alignment audits
Threat hunting and campaign correlation (domains, IPs, headers)
AI/LLM tool-assisted analysis workflows
Customer-facing crisis communication and technical onboarding

Common question themes

Walk through investigating a suspected BEC email end to end

How would you design a DMARC rollout to strict Reject for a resistant customer

Describe a phishing campaign you tracked across multiple indicators

How have you used AI/LLM tools to speed up daily security analysis

How do you decide when to escalate directly to a customer by phone

What feedback would you give Detection Engineering after a missed detection

How candidates describe it

Real Response Engineer interview stories — retold from candidates' public write-ups, with sources.

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