ByteDance interview questions

Choose Precision, Recall, or F1 for Agent Evaluation

Companies: ByteDance

Model Evaluation

Choose Ranking Functions, Customer Value Metrics, and Predictive Models

Companies: ByteDance

Metrics & KPIs · SQL

Design a Local Recommendation System

Companies: ByteDance

Ranking Models · Recommendation Systems

Explain deployment, retrieval, and regularization

Companies: ByteDance

Explain GRPO for LLM Reinforcement Learning and How It Differs from PPO

Companies: ByteDance

Fine-Tuning & Alignment Techniques · Reinforcement Learning

Explain Sampled-Softmax Correction and Classification Loss Choice

Companies: ByteDance

Explain train-test generalization gap

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Explain Train-Test Performance Gap

Companies: ByteDance

How to deploy and tune multimodal models?

Companies: ByteDance

Embeddings & Vector Search · MLOps & Model Serving

How would you choose a classification threshold?

Companies: ByteDance

Implement a Transformer Decoder from Scratch Without Starter Code

Companies: ByteDance

ML Coding · Transformers & Attention

Implement Multi-Head Attention from Scratch

Companies: ByteDance

ML Coding · Transformers & Attention

Implement Multi-Head Attention from Tensor Operations

Companies: ByteDance

ML Coding · Transformers & Attention

LRU Cache

Implement an LRUCache that supports O(1) average-time get(key) returning the value or -1 and put(key, value) which inserts or updates a key and, if capacity…

Companies: ByteDance, Adobe, Amazon, Anthropic +29

Data Structure Design · Design · Doubly-Linked List · Hash Table

Number of Islands

Count the number of islands (4-directionally connected components of '1's) in an m×n binary grid. This is a connected-components/flood-fill problem typically solved with…

Companies: ByteDance, Amazon, Anduril, Apple +16

Array · Breadth-First Search · Depth-First Search · Matrix

Predict Short-Video Engagement with Skewed Data

Companies: ByteDance

Feature Engineering · Supervised Learning

Rotate Image

Given an n×n matrix, rotate it 90° clockwise in-place (no extra matrix allowed), i.e., rearrange the elements so each row becomes the corresponding column after…

Companies: ByteDance, Bloomberg, Meta, NVIDIA

Array · Math · Matrix

Write the Cross-Entropy Loss and Compute Precision, Recall and F1

Companies: ByteDance

ML Fundamentals · Model Evaluation