Machine Learning Engineer Coding & Algorithms Interview Questions
Practice the exact questions companies are asking right now.
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Implement a web crawler using a provided API
Web Crawler (BFS) You are implementing a simple web crawler. Given - A starting URL startUrl. - A provided API: - List<String> getUrls(String url) w...
Compute time to infect all cells
You are given an n × m grid representing people in a city. - Each cell is either infected (1) or healthy (0). - Two cells are neighbors if they share ...
Implement multi-head attention and LLM sampling
Task A: Multi-head attention (forward pass) You are implementing a Transformer attention layer. Given: - A sequence length L and model dimension d_mod...
Sample index from probability distribution
You are given a discrete probability distribution for an \(M\)-sided die as an array p[0..M-1], where each p[i] is non-negative. Design a function sam...
Minimize batches and allocate riders by time
Coding prompts (same interview round) 1) Minimum number of batches for time points You are given a list of event time points (integers), e.g. [1, 3, 5...
Can you reach target with distance-threshold edges?
You are given a set of unordered 2D points points[], a start point and an end point (both are included in points), and a function: `text getDistance(p...
Compute point-to-segment minimum distance
Problem Given a 2D point P(x, y) and a line segment with endpoints A(x1, y1) and B(x2, y2), compute the minimum Euclidean distance from point P to the...
Debug and optimize a card-drawing strategy
You are given a simplified card game engine with unit tests. The game is played using a table of face-up cards; each card has an integer value. On eac...
Implement an LRU Cache
Problem Design and implement an LRU (Least Recently Used) Cache that supports the following operations in O(1) average time: - get(key): - Return th...
Find shortest path in a maze grid
Maze shortest path You are given a 2D grid maze of size m x n where: - 0 represents an open cell - 1 represents a wall (cannot pass) You are also give...
Sample a string by real-valued scores
You are given: - A list of strings texts (e.g., user comments), length n. - A list of floating-point scores scores of length n, where each score can b...
Convert stack samples to execution trace
You are given sampling-profiler output: a list of Sample objects ordered by timestamp ascending. Each Sample has (t: float, stack: list[str]) where st...
Find a secret word using match feedback
You are given a list of unique words, each with the same length (e.g., 6 lowercase letters). One of these words is the secret. You can repeatedly make...
Choose K pickup locations minimizing L1 distance
Coding: K Shuttle Pickup Locations (L1) You are given the coordinates of N people on a 2D grid. You want to open K shuttle pickup locations (pickup po...
Maximize unique characters from a word list
Maximize Unique Characters From a Word List You are given a list of strings words. You may select any subset of these strings (each string used at mos...
Design a robot movement command system
Robot Movement (Pair Programming) You are given an empty starter repository (only a README). Implement a small, testable robot movement module that ca...
Implement alert queries and spike detection
You are building an in-memory alert analytics component. Each alert has: - timestamp (integer seconds since epoch) - severity (one of a small fixed se...
Find earliest supporting version under constraints
You are given version strings formatted as {major}.{minor}.{patch}, e.g., "103.003.03". Each version either supports a feature or not. You may call is...
Find two numbers summing to target without hashmap
Problem Given an integer array nums (length n) and an integer target, return the indices (i, j) such that: - i != j - nums[i] + nums[j] == target You ...
Generate all hyperparameter combinations
You are given several groups of hyperparameter choices for an ML experiment. Each group contains one hyperparameter name and a list of candidate value...