Senior Detection & Response Engineer

About the role

You're the detection engineer people turn to when they ask "what does Microsoft actually see here?" Not the marketing-slide answer, the real map. Which product emits which telemetry, any anticipated ingestion lags, what table or API it lands in, which license tier gates it, how long it survives before it ages out, and where the documentation quietly disagrees with reality. When a new technique drops, your first instinct is to ask which Microsoft signal would catch it, and whether customers have it switched on. You also know Microsoft never sits still. Hunting tables appear, columns get renamed, Graph versions retire, capability shuffles between SKUs, previews go GA, features quietly vanish, and native alert logic shifts underneath you. You've got a repeatable way of staying ahead of that churn instead of finding out when a detection stops firing. You're comfortable behind a command line and in front of a customer, including scenarios where the conversation isn’t pleasant. If that's you, we'd love to talk! We have an amazing team and believe you'll love getting to know us. At Expel, we help businesses bridge the cybersecurity talent gap by providing transparent Managed Detection and Response. To do this we build technology to make sure our security analysts are solving important problems, and automation is helping them make better decisions at every step. We delight in using technology to make security accessible for our customers.

Responsibilities

• Own our detection coverage across Defender XDR, Entra ID, Sentinel, Microsoft Graph, Azure, and Microsoft 365 — from raw signal through to shipped, tuned detections
• Build and maintain a living map of Microsoft security signal: what exists, known ingestion lag, where it lands, what gates it, how long it's kept, and how far you can trust it
• Track how that signal changes and turn every material change into a concrete action — catching drift before it costs us efficacy
• Tell us where Microsoft's native detections are strong enough to lean on, where they're noisy or shallow, and where Expel needs its own layer
• Make SOC analysts faster by automating Microsoft-specific investigative workflows against the Graph, Defender, Sentinel, and Entra APIs
• Partner with Engineering on our Microsoft integrations — ingestion, API limits and throttling, and schema mapping