Apple Interview Questions
Practice 134 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.
"I got asked a hardcore MCM DP question and I saw it on PracHub as well. Solved that question in 5 minutes. Without PracHub I doubt I could solve it in 5 hours. Though somehow didn't get hired, perhaps I guess I solved it too fast? /s"
"Believe me i'm a student here jn US. Recently interviewed for MSFT. They asked me exact question from PracHub. I saw it the night before and ignored it cause why waste time on random sites. I legit wanna go back and redo this whole thing if I had chance. Not saying will work for everyone but there is certainly some merit to that website. And i'm gonna use it in future prep from now on like lc tagged"
"10 years of experience but never worked at a top company. PracHub's senior-level questions helped me break into FAANG at 35. Age is just a number."
"I was skeptical about the 'real questions' claim, so I put it to the test. I searched for the exact question I got grilled on at my last Meta onsite... and it was right there. Word for word."
"Got a Google recruiter call on Monday, interview on Friday. Crammed PracHub for 4 days. Passed every round. This platform is a miracle worker."
"I've used LC, Glassdoor, and random Discords. Nothing comes close to the accuracy here. The questions are actually current — that's what got me. Felt like I had a cheat sheet during the interview."
"The solution quality is insane. It covers approach, edge cases, time complexity, follow-ups. Nothing else comes close."
"Legit the only resource you need. TC went from 180k -> 350k. Just memorize the top 50 for your target company and you're golden."
"PracHub Premium for one month cost me the price of two coffees a week. It landed me a $280K+ starting offer."
"Literally just signed a $600k offer. I only had 2 weeks to prep, so I focused entirely on the company-tagged lists here. If you're targeting L5+, don't overthink it."
"Coaches and bootcamp prep courses cost around $200-300 but PracHub Premium is actually less than a Netflix subscription. And it landed me a $178K offer."
"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."
Implement Masked Multi-Head Self-Attention
Implement the core self-attention module used inside a Transformer encoder. Given an input tensor X of shape (batch_size, sequence_length, d_model), f...
Find Common Prefix Across Strings
Given an array of strings, return the longest string prefix that is shared by every string in the array. A prefix must start at index 0 of each string...
Discuss Challenges and Career Goals
Answer the following behavioral interview questions: 1. What was the most difficult problem you have faced in your work, and how did you approach it? ...
Design a deck of cards with shuffle/draw
Object-Oriented Design + Randomness Design an in-memory model of a standard 52-card deck. Requirements - Create classes to represent at least: - Car...
How to debug a Python loop-condition bug
You are given a Python script that appears to hang or produce incorrect results because of a bug in a loop condition (e.g., while/for termination logi...
How to root-cause Wi‑Fi chip stops after 30 minutes
You are running automated tests on a Wi‑Fi chip. The chip transmits normally at the beginning, but after about 30 minutes it stops transmitting (no si...
Answer OoO, caches, and memory-system questions
You are interviewing for a CPU/DV role. Provide clear explanations (and small worked examples where useful) for the following computer architecture to...
Analyze vision model failures
For a computer vision product, discuss the following: 1. Explain the core machine learning fundamentals that matter most in vision work, including bia...
Solve linked list, grid BFS, and median queries
You are given three separate algorithmic tasks. 1) Reorder a linked list by odd/even positions Given the head of a singly linked list, reorder the nod...
Count subarrays with sum equals k
Given an integer array nums (may contain negative numbers and zeros) and an integer k, return the number of contiguous subarrays whose sum is exactly ...
Design ad click aggregator and file sync service
You have two system design prompts. 1) Design an ads click aggregation system Design a service that ingests ad click events at very high QPS and suppo...
Make tree iterators safe under concurrency
You have a binary tree and an inorder iterator implementation that maintains internal traversal state (e.g., a stack). Consider a multi-threaded progr...
Find Minimum Processing Rate
You are given an array piles, where piles[i] is the number of items in the i-th pile, and an integer h representing the maximum number of hours availa...
Compare DCN v1 vs v2 and A/B test
Part A — DCN variants You are building a CTR/CVR prediction model for a recommender/ads system using a Deep & Cross Network (DCN). 1. Explain the key ...
Merge overlapping time intervals
Problem: Merge Intervals You are given an array of intervals intervals, where each interval is a pair [start, end] with start <= end. Merge all overla...
Design a smartwatch sensor subsystem
You are designing the sensing subsystem for a health-focused smartwatch. Describe how you would take the product from requirements to production. Your...
Implement multi-head self-attention correctly
Implement Multi-Head Self-Attention (from scratch) Context You are given an input tensor X with shape (batch_size, seq_len, d_model). Implement a mult...
Explain thermal and signal fundamentals
Answer the following hardware fundamentals questions for a wearable sensor product: 1. Model a heat-transfer path as an equivalent thermal-resistance ...
Critique a Linear Regression Workflow
You are reviewing another data scientist's approach to modeling website dwell time for users who arrive from Google Search. - Response variable: Y, th...
Encode and Rebuild a Binary Tree
Design two functions for a binary tree: - encode(root) -> string - decode(data) -> root Each tree node contains an integer value and has up to two chi...