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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"I honestly don't know how you guys gather so many real interview questions. It's almost scary. I walked into my Amazon loop and recognized 3 out of 4 problems from your database."
"Discovered PracHub 10 days before my interview. By day 5, I stopped being nervous. By interview day, I was actually excited to show what I knew."
"I recently cleared Uber interviews (strong hire in the design round) and all the questions were present in prachub."
"The search is what sold me. I typed in a really niche DP problem I got asked last year and it actually came up, full breakdown and everything. These guys are clearly updating it constantly."
Rotate a Matrix In Place
Given an n x n matrix of integers, rotate the matrix 90 degrees clockwise. Implement the function in Python. You may use a straightforward approach wi...
Find longest uniform substring after k replacements
Given a string s (ASCII, length up to 2e5) and integer k (0 ≤ k ≤ |s|), return the length of the longest substring that can be turned into all the sam...
Compute optimal matrix-chain multiplication order
Matrix Chain Multiplication: Optimal Parenthesization and Analysis You are given five matrices to multiply: A1 (10×30), A2 (30×5), A3 (5×60), A4 (60×2...
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...
Design a rolling five-minute hit counter
Design an in-memory hit counter that supports: ( 1) recordHit(timestamp) to log an event, and ( 2) getCountLast5Minutes(now) to return the number of e...
Compute minimum required meeting rooms
Given a list of meeting time intervals [start, end) for many events, determine the minimum number of rooms required so no meetings overlap in the same...
Sort and merge string lists by length
Given two unsorted lists of strings, return a single list sorted by ascending string length. Specify your tie-breaking rule for equal-length strings (...
Design card deck with shuffle and order
Design a playing-card deck library with two methods: shuffle() to return a uniformly random permutation of a standard 52-card deck, and order() to ret...
Write queries to compute salary and budget stats
You are given the following interview tasks. Write solutions in SQL and/or Python (pandas) as appropriate. Task 1 — Second highest salary You have a t...
Compute and Rank Store Revenue by Region Using Pandas
Sales +------------+---------+------------+--------+---------+ | date | store_id| product_id | units | revenue | +------------+---------+------...
Implement sparse vector dot product and cosine similarity
Sparse Vector Class Implement a SparseVector class for high-dimensional vectors where most entries are zero. Representation Assume each vector has: - ...
Find Maximum Sum of Contiguous Subarray Length k
Scenario Monitoring website traffic and needing the highest traffic within any fixed-length time window. Question Given an array of positive integers ...