Meta Machine Learning Engineer Interview Questions

I would first determine whether the missing value is common, rare, or a sign of a pipeline bug. Then I would define fallback behavior such as imputation, default values, or a safe degraded path if the feature is unavailable. The reason I choose this approach is that production models need to behave predictably even when some inputs are missing. I would also think about logging missingness, because repeated missing features can indicate data pipeline issues. If the interviewer wants more depth, I would discuss training the model to be robust to missing inputs.

I would first define the exact behavior that looks biased and identify the affected user groups or content types. Then I would inspect training data, features, and evaluation slices to see whether the issue comes from data imbalance, labeling bias, or model behavior. The reason I choose this approach is that bias complaints need careful analysis rather than vague reassurance. I would also think about mitigation, monitoring, and whether a fairness metric should be added to the evaluation process. If the interviewer wants more depth, I would mention escalation and review by domain experts.

I would first define what 'best' means, because it could mean lowest cost, highest quality, lowest latency, or safest answer. My design would include a router that looks at request type, user risk, latency budget, and model capability before selecting a target model. The reason I choose this approach is that not every request needs the most expensive model. I would also think about fallback logic, router evaluation, and how to avoid inconsistent behavior. If the interviewer wants more depth, I would mention per-request telemetry and A/B testing.