4 min read Design a distributed ID generation service. Every large-scale system needs unique IDs — for database rows, events, messages, and transactions. […] Read article
5 min read One of the most common ML interview questions isn’t about a specific algorithm — it’s “how do you decide which […] Read article
6 min read Design a navigation system like Google Maps. This problem combines geospatial data at scale, graph algorithms, real-time data ingestion, and […] Read article
5 min read Design a hotel or vacation rental reservation system like Booking.com or Airbnb. The core challenge isn’t the search UI — […] Read article
6 min read Feature selection and dimensionality reduction are how you fight the curse of dimensionality — the phenomenon where models trained on […] Read article
5 min read Imbalanced datasets — where one class dramatically outnumbers another — are the norm in production ML, not the exception. Fraud […] Read article
5 min read Cross-validation is how you estimate a model’s generalization performance before deploying it. Getting this wrong — especially data leakage — […] Read article
4 min read Design a news feed system like Facebook’s. This is a richer problem than the Twitter feed design — Facebook’s feed […] Read article
5 min read Design a web crawler that can index a significant portion of the internet. This question tests whether you understand distributed […] Read article
6 min read Backpropagation is the algorithm that makes training deep neural networks possible. Every interviewer for ML engineering or research roles expects […] Read article