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This is a hard difficulty Machine Learning question, commonly asked during Onsite rounds at Meta.

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This question is commonly asked for Data Scientist candidates at Meta during technical interviews.

Design hashtag recommender with cold start

Last updated: Mar 29, 2026

Quick Overview

This question evaluates expertise in recommender-system design, feature engineering, ranking and learning-to-rank models, cold-start strategies, evaluation and debiasing techniques, and operational concerns like latency, memory, interpretability, and safety guardrails.

hard
Meta
Machine Learning
Data Scientist

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Design hashtag recommender with cold start

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