Meta Security Engineer Interview Questions

I would start by building behavioral baselines for normal admin activity, then look for deviations in timing, scope, frequency, and sequence of actions. I would combine endpoint telemetry, network logs, identity events, and process lineage so I can distinguish malicious activity from legitimate operations. The key is to focus on patterns and context rather than relying only on static indicators.

I would apply least privilege, strong identity controls, segmentation, encryption, logging, and automated policy enforcement. At scale, security has to be built into the platform so teams can ship safely without re-solving the same problems independently. I would also prioritize monitoring and incident response because scale increases both the impact and speed of failures.

I would define the service boundary, identify valuable assets, map trust boundaries, and enumerate likely attacker goals. Then I would rank the risks by impact and likelihood and turn the highest risks into concrete design changes. Threat modeling is most useful when it leads directly to better architecture, not just a document.

I would review the data flow, access control, secrets handling, external interfaces, and logging before release. Then I would test the likely abuse cases, verify the rollout plan, and make sure there is a clear path for monitoring and rollback. A good launch process assumes that security issues are most likely to appear at the boundaries.

I would correlate identity, endpoint, application, and network telemetry to reconstruct the sequence of events. Then I would determine scope, contain the threat, preserve evidence, and verify whether the activity was malicious or benign. Good investigation work is fast, methodical, and evidence-driven.