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

Data Engineer • Coding • medium

Write a SQL query to find the second highest salary per department.

#Window Functions #SQL
Practice
Data Engineer • Coding • medium

Write a SQL query to compute a 7-day rolling average of daily sales.

#Window Functions #Analytics
Practice
Data Engineer • Coding • medium

Write a SQL query to find the top 3 most played songs per genre for the last 30 days, but only include users who have an active Apple Music subscription.

#Window Functions #Joins #Filtering
Practice
Data Engineer • Coding • hard

Given a table of Siri interaction events (user_id, timestamp, event_type), write a SQL query to calculate the average session length. A new session starts if there is a gap of more than 15 minutes between events for the same user.

#Gaps and Islands #CTEs #Time-series Data
Practice
Data Engineer • Coding • medium

Write a SQL query to calculate the 7-day rolling retention rate of users who signed up for an Apple Arcade free trial.

#Cohort Analysis #Self Joins #Date Functions
Practice
Data Engineer • Technical • medium

Explain the difference between OLAP and OLTP systems. When would you use each?

#OLAP #OLTP #Databases
Practice
Data Engineer • Technical • hard

How would you optimize a SQL query that is running slowly on a 1 billion row table?

#Query Optimization #Indexing
Practice
Data Engineer • Technical • medium

Explain the difference between RANK(), DENSE_RANK(), and ROW_NUMBER().

#Window Functions #SQL
Practice
Data Engineer • Technical • medium

What is a materialized view? How does it differ from a regular view?

#Materialized Views #Performance
Practice
Data Engineer • Technical • medium

What are CTEs (Common Table Expressions) and how do they differ from subqueries?

#CTEs #SQL
Practice

Difficulty Radar

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Meet Your Interviewers

The "Standard" Interviewer

Senior Engineer

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

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Unwritten Rules

Think Out Loud

Always explain your thought process before writing code or drawing architecture.

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