Apple

Apple

Consumer electronics, software, and services leader known for secrecy and quality.

5 Rounds ~30 Days Very Hard
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The Interview Loop

Recruiter Screen (30 min)

Standard fit check, behavioral questions, and resume overview.

Technical Loop (3-4 Rounds)

Deep dive into domain knowledge, coding, and system design.

Interview Question Bank

Cloud Engineer • Coding • medium

Given a massive log file of Apple TV+ streaming requests, write an algorithm to find the top 10 most frequent IP addresses. The file is too large to fit into memory.

#Data Structures #MapReduce #Hashing #Heaps
Practice
Data Engineer • Coding • medium

Write a Python function to parse a large directory of iCloud sync log files, extract all unique error codes, and return the top K most frequent errors along with their counts. Optimize for memory if the logs exceed available RAM.

#Python #Generators #Heap / Priority Queue #File I/O
Practice
Data Engineer • Coding • easy

Given an array of search query strings from the App Store, write a Python script to group anagrams together.

#Python #Hash Maps #Strings
Practice
Data Scientist • Coding • easy

Given an array of integers representing hourly battery drain percentages from an iPhone, write a function to find the maximum sum of a contiguous subarray of size exactly K.

#Sliding Window #Arrays #Python
Practice
Data Scientist • Coding • medium

Write a Python function to compute the cosine similarity between two sparse vectors representing user app download histories. The vectors are represented as dictionaries where keys are app IDs and values are download counts.

#Math #Hash Maps #Python
Practice
Data Scientist • Coding • medium

Given a list of strings representing user search queries in the App Store, write an algorithm to group anagrams together. For example, ['listen', 'silent', 'apple', 'elppa'] should return [['listen', 'silent'], ['apple', 'elppa']].

#Strings #Hash Maps #Sorting
Practice
Machine Learning Engineer • Coding • hard

Given two strings representing a recognized voice command and a target command, find the minimum number of operations (insert, delete, replace) required to convert one to the other.

#Dynamic Programming #Strings
Practice
Machine Learning Engineer • Coding • medium

Implement a sparse matrix multiplication algorithm. Assume the matrices are too large to fit in memory if represented densely.

#Arrays #Hash Tables #Math
Practice
Machine Learning Engineer • Coding • medium

Given a list of app usage sessions represented by start and end timestamps, find the maximum number of apps open concurrently on a user's device.

#Arrays #Sorting #Intervals
Practice
Machine Learning Engineer • Coding • medium

Given a string of characters without spaces (e.g., a continuous voice transcription) and a dictionary of valid words, determine if the string can be segmented into a space-separated sequence of dictionary words.

#Dynamic Programming #Strings #NLP
Practice
ML Engineer • Coding • medium

Implement a sliding window approach to detect anomalies in a time series.

#Anomaly Detection #Time Series
Practice
ML Engineer • Coding • hard

Implement a K-means clustering algorithm from scratch in Python.

#K-Means #Clustering
Practice
ML Engineer • Coding • hard

Implement logistic regression with gradient descent in NumPy.

#Logistic Regression #NumPy
Practice
Software Engineer • Coding • easy

Given a string containing just the characters '(', ')', '{', '}', '[' and ']', determine if the input string is valid. This is useful for parsing configuration files.

#Stacks #Strings
Practice
Software Engineer • Coding • medium

Given an array of meeting time intervals, merge all overlapping intervals. We use similar logic in the Calendar app to determine a user's free/busy availability.

#Arrays #Sorting
Practice
Software Engineer • Coding • hard

Design an algorithm to serialize and deserialize a binary tree. This concept is similar to how we might freeze and restore the state of a complex UI view hierarchy.

#Trees #String Manipulation #DFS/BFS
Practice
Software Engineer • Coding • medium

You are given a 2D grid representing a map of land and water. Write a function to count the number of islands. Imagine this is a sub-routine for rendering custom geographic clusters in Apple Maps.

#Graph #DFS #BFS
Practice
Software Engineer • Coding • hard

Given a string of server logs and a string of target error codes, find the minimum window substring in the logs that contains all the error codes. This is used for rapid crash analysis in Xcode.

#Sliding Window #Hash Table #Strings
Practice
Software Engineer • Coding • medium

Implement an LRU (Least Recently Used) Cache. Imagine we are using this to cache album artwork in the Apple Music app to minimize network requests.

#Data Structures #Hash Map #Doubly Linked List
Practice

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The "Standard" Interviewer

Senior Engineer

Focuses on core competencies, system constraints, and clear communication.

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Think Out Loud

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