Apple Interview Questions
Practice 152 real Apple interview questions for 2026. Covers all top categories — Coding & Algorithms, Behavioral & Leadership, Machine Learning, Software Engineering Fundamentals, and System Design — with real questions from actual interviews and detailed solutions. This Apple interview questions collection is software-engineering heavy: expect many timed coding rounds and system-level discussions alongside domain interviews for Data Science and ML. What Apple evaluates most is algorithmic fluency, systems and hardware thinking, experiment rigor, and cross-functional communication. For interview preparation, prioritize timed problem sets, systems and memory fundamentals, clear STAR behavioral stories, and role-specific case studies. Drill into the position themes revealed by real question titles: Software Engineers should prepare classic algorithm problems (matrix rotation, Tower of Hanoi, common coding patterns) plus low-level topics such as out-of-order execution, caches, memory systems, SystemVerilog verification, and embedded sensor/thermal signal design and debugging. Data Scientists face regression critique, experiment diagnosis, leakage-safe modeling and calibration, SQL analysis, and vectorized feature implementations. Machine Learning Engineers see on-device optimization, vision/audio preprocessing and failure analysis, retrieval/ranking and grounded-voice assistant design. Data Engineers get practical data-structure and utility coding. Tailor your prep to these themes for the best results.
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Remove shortest subarray to sort array
Given an integer array nums (length up to 2×10^5), return the shortest subarray [L,R] you can remove so that the remaining elements form a non‑decreas...
Implement rotation, LRU cache, streaming median, cycle detection
Complete the following coding tasks. For each, provide code, justify time/space complexity, and describe edge cases: 1) Image rotation: Given an n×n i...
Implement DFS for connected components
Given an undirected graph with n nodes (1 ≤ n ≤ 200, 000) and an edge list, implement depth-first search to compute (a) the number of connected compon...
Implement bag-of-words similarity search from scratch
Implement a bag-of-words–based text similarity search engine from scratch. Write code that: ( 1) tokenizes text (lowercasing, punctuation handling, Un...
Design a snapshotable key-value store
Design a snapshotable key-value store Design and implement a snapshotable key–value map supporting the following APIs: - S(key, value): set the curren...
Analyze TSV File for User Page Visits and Patterns
visits +-----------+-----------+------+ | person_id | timestamp | page | +-----------+-----------+------+ | 1 | 100 | A | | 1 ...
Maximize funds with capital-gated projects
Maximize funds with capital-gated projects You start with initial funds W and may undertake at most K projects. Each project i has a required capital ...
Solve Subset Sum And Return All Matching Subsets
Given an array of non-negative integers and a target, first determine whether any subset sums to the target using dynamic programming with O(target) s...
Vertical Order Traversal of a Binary Tree
Vertical Order Traversal of a Binary Tree You are given the root of a binary tree. Return the vertical order traversal of its nodes' values — that is,...
Find the Extra Edge
You are given an undirected graph that started as a tree with n nodes labeled from 1 to n. One additional edge was then added between two different ex...
Generate Tower of Hanoi moves
You are given n disks of different sizes stacked on peg A (largest at bottom). You have two other pegs, B and C. You may move one disk at a time, and ...
Implement Kubernetes Service Dependency Queries
You are given an in-memory inventory of Kubernetes-like services. Each service has the following fields: `text Service { id: string // ...
Zero out duplicates and sort an array
Coding question You are given an integer array arr of length about 75. - The data is not sorted. - The array may contain duplicate values. - You must ...
Implement a lazy inorder traversal iterator
This question evaluates understanding of binary tree traversal and iterator design, specifically the implementation of a lazy inorder iterator under t...
Count subarrays with sum equals k
This question evaluates a candidate's competency in array algorithms and reasoning about contiguous subarray sums, including correct handling of negat...
Solve mixed coding tasks from interviews
Solve the following interview-style coding problems (you may choose any programming language unless specified). Provide correct logic and handle edge ...
Solve 15 common interview problems
Below are fifteen independent coding problems commonly discussed in software engineering interviews. For each one, write an efficient algorithm and be...
Implement most frequent key without using max()
You are given the following Python class skeletons. The Parent class precomputes: - self.l: the original list - self.lf: a set of the stringified item...
Write a generator for substring pattern matches
Problem Write a generator that scans a string and emits a value whenever a substring matches a given pattern. Input - A string s - A string pattern (n...
Implement TF-IDF scoring for documents
Problem Implement a simplified TF–IDF scorer. You are given: - A list of documents docs, where each document is a string. - A query string q. Tokeniza...