Build end-to-end search ranking and personalization ML systems across Airbnb's platform

Airbnb's Relevance and Personalization team owns search and recommendation ranking across the entire platform, spanning data pipelines, feature/model innovation, and serving/experimentation infrastructure at scale. This interview tests hands-on ML engineering depth — productionizing models (batch and real-time), ML best practices like training/serving skew and feature selection, and fluency with tools like TensorFlow, PyTorch, Kubernetes, Spark, or Kafka. Strong candidates show they can both build models and reason about the surrounding infrastructure (feature platforms, model interpretability, hyperparameter optimization, concept drift).

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Productionizing ML models for batch and real-time ranking/personalization
ML best practices: training/serving skew, feature/model selection, A/B testing
Search ranking and recommendation systems at scale
ML infrastructure: feature platforms, model interpretability, concept drift detection
Cross-functional collaboration with PMs, engineers, and data scientists