Tell me about an AI security issue you discovered or remediated.

Use STAR format (Situation, Task, Action, Result). Best examples come from: (1) hands-on lab work — show you tested LLM apps against OWASP Top 10; (2) personal projects — built RAG app, found prompt injection vector, documented mitigation; (3) certification training — discuss specific attack chains learned via MITRE ATLAS exercises; (4) published research — even small blog posts on AI security demonstrate engagement. Avoid: hypothetical 'I would do X' answers. Interviewers want concrete demonstrations of actually doing the work, even small in scale.