Microsoft Interview Questions
Practice the exact questions companies are asking right now.
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Implement interval room counter and token manager
You are given two coding questions. 1) Minimum number of rooms for time intervals You are given a list of meetings, where each meeting is an interval ...
Design a cloud console main page
Scenario You are building the main landing page (home page) of a cloud service console that a user sees immediately after logging in (e.g., similar to...
Implement a Snapshot Set Iterator
Implement a data structure SnapshotSet<T> with the following interface: `java interface SnapshotSet<T> { void add(T e); void remove(T e); ...
Answer common graph, grid, and array tasks
Problem 1: Largest continuous island after filling sea (1D) Humans can convert ocean cells into land by filling them. Input - islands: a 1D array of l...
Find all balanced k in a permutation
You are given a permutation \(p\) of length \(n\) containing each integer from \(1\) to \(n\) exactly once. For each \(k\) where \(1 \le k \le n\), de...
Design a ChatGPT-like serving system
Design a ChatGPT-like system for inference serving. Your design discussion should cover: 1. High-level architecture for chat completion (request routi...
Compute discounted prices and full-price indices
You are given an array prices of length \(n\). Items are sold from left to right, and each item’s final selling price is computed as follows: For item...
Explain KNN and how to tune it
K-Nearest Neighbors (KNN) fundamentals You are interviewing for a Data Scientist role. 1. Explain how the KNN algorithm works for both classification ...
Stream output until stop token appears
You are implementing a simplified streaming conversational AI output filter. Text arrives in chunks (strings) in order. There is a special stop token ...
Reconstruct DNA from tagged fragments
You are given a list of DNA fragments. Each fragment is represented by a Sequence object containing two endpoint labels and a DNA string payload. Your...
Implement a type-based mutex for tasks
Problem You are given a multithreaded task runner. Each task has: - task_id: int - task_type: "gen" | "score" - duration: int (seconds) Each task runs...
How do you choose a model?
You are building machine learning features for a spreadsheet assistant. Explain how you would choose an appropriate model for a new problem. In your a...
Validate a JSON-like string
Problem You are given a string s that is intended to be a JSON text. Implement a function isValidJsonStructure(s) -> bool that checks structural valid...
Design a high-scale URL shortener
Design a URL shortening service. Core APIs / Features - Create short URL: accept a long URL and return a short code / short URL. - Redirect: given a s...
Find maximum collinear points
Given a list of 2D points with integer coordinates, return the maximum number of points that lie on the same straight line. Input - points: a list of ...
Design a simple API rate limiter
Design a rate limiter for an API. Scenario You operate an HTTP API (e.g., /v1/*). You need to prevent abuse by limiting request rates. Requirements (c...
Design REST APIs for JSON file storage
Scenario Design a service that stores JSON files/documents and exposes a RESTful API for clients. Requirements - Clients can upload, download, list, a...
Compute and plot a precision–recall curve
Precision–Recall (PR) curve coding / evaluation You are given a binary classifier’s outputs on a dataset: - y_true: array of true labels in \(\{0,1\}\...
Clean OCR data and build an LLM dataset
Problem: OCR data practice (cleaning → LLM-ready data) You are given an OCR dataset intended to train or fine-tune an LLM to improve OCR text quality....
Design a job scheduler ETL pipeline system
System Design Prompt Design a Job Scheduler + ETL pipeline system. The system should allow users (or internal services) to: - Define ETL jobs (extract...