AI Engineer Interview Questions

AI Engineers build products on top of existing foundation models; ML Engineers build and serve models themselves. The AI Engineer skill set centres on retrieval, prompting, evaluation, latency and cost — closer to backend and product engineering than to research. ML Engineering involves training pipelines, feature stores and model serving infrastructure. Interviews differ accordingly: AI Engineer loops rarely ask you to derive backpropagation, and frequently ask you to design a RAG system and defend how you would know it works.

Diagnosing a wrong answer. Interviewers describe a system returning poor responses and expect you to separate retrieval failure from generation failure — checking whether the correct chunk was retrieved at all, whether it ranked highly enough to survive the context window, whether chunking split the answer across boundaries, and only then whether the model ignored what it was given. Candidates who jump straight to prompt tweaking without inspecting retrieval reveal they have not debugged one in production.

Shipped systems with quality and cost numbers. Users served, eval set size and the metric you hold, p95 latency, cost per request, and the business outcome. "Built a RAG assistant over 500k documents serving 40k users at 82% answer accuracy on a 400-case eval set, p95 2.1s, $0.008 per query" demonstrates the whole discipline. Prompt engineering described without evaluation reads as experimentation rather than engineering.

No, and many strong AI engineers come from backend or full-stack engineering. What matters is solid software engineering, comfort with APIs and data pipelines, and a rigorous instinct for measurement. The concepts you genuinely need — embeddings, vector search, context limits, sampling parameters, evaluation design — are learnable without formal ML training. Deep learning theory becomes relevant only if you move toward fine-tuning or model training, which is the ML Engineer path.