Apple is the least standardised loop of the big five. The team you interview with matters more than the company: one team runs a Google-shaped algorithm ladder, the next spends most of the time on systems and low-level detail, and a third asks mostly about your past work. There is no single Apple interview to prepare for.
The practical consequence is that research the team, not just the company. Ask your recruiter what the loop looks like and what the team builds -- that question is expected here and the answer changes what you should revise.
The least standardised process of the five — the team you are interviewing with matters more than the company. Some teams run classic algorithms, others run domain-specific systems questions.
The loop
The bar
What they lean on
This is the durable part. Which pattern families a company favours is far more stable than which individual problems it uses, so prepare in this order:
linked-listsstringsdesign-iterators-and-flattenersbit-manipulation-tricksbinary-search-template-and-variantssimulation-and-stateful-iteration
Quirks worth knowing
- Language and memory-model internals come up more than at other companies. Be ready to discuss how Python objects are laid out.
- Some teams ask no LeetCode at all and go straight to domain design. Others are pure algorithms. Confirm in advance.
- Secrecy is real — expect little detail about what you would work on until late in the process.
Reported problems
- 206Reverse Linked Listeasy
- 21Merge Two Sorted Listseasy
- 141Linked List Cycleeasy
- 242Valid Anagrameasy
- 13Roman to Integereasy
- 14Longest Common Prefixeasy
- 35Search Insert Positioneasy
- 58Length of Last Wordeasy
- 67Add Binaryeasy
- 125Valid Palindromeeasy
- 136Single Numbereasy
- 169Majority Elementeasy
- 190Reverse Bitseasy
- 191Number of 1 Bitseasy
- 338Counting Bitseasy
- 657Robot Return to Origineasy
- 704Binary Searcheasy
- 33Search in Rotated Sorted Arraymedium
- 875Koko Eating Bananasmedium
- 6Zigzag Conversionmedium
- 12Integer to Romanmedium
- 34Find First and Last Position of Element in Sorted Arraymedium
- 78Subsetsmedium
- 137Single Number IImedium
- 151Reverse Words in a Stringmedium
- 173Binary Search Tree Iteratormedium
- 201Bitwise AND of Numbers Rangemedium
- 251Flatten 2D Vectorpremiummedium
- 271Encode and Decode Stringspremiummedium
- 274H-Indexmedium
- 284Peeking Iteratormedium
- 289Game of Lifemedium
- 341Flatten Nested List Iteratormedium
- 371Sum of Two Integersmedium
- 421Maximum XOR of Two Numbers in an Arraymedium
- 874Walking Robot Simulationmedium
- 900RLE Iteratormedium
- 981Time Based Key-Value Storemedium
- 1041Robot Bounded In Circlemedium
- 1586Binary Search Tree Iterator IIpremiummedium
- 68Text Justificationhard
- 135Candyhard
- 600Non-negative Integers without Consecutive Oneshard
- 1483Kth Ancestor of a Tree Nodehard
Pitfalls
- Preparing a generic big-tech loop. Ask the recruiter for the round breakdown. Apple recruiters generally answer, and the variance between teams is large enough that guessing wastes preparation.
- Neglecting depth on your own past work. Several teams weight this heavily. Be able to go three questions deep on anything on your CV, including the parts you would rather skip.
- Assuming no low-level questions. Depending on the team, memory layout, concurrency, or performance detail can appear. Know why a
listis not a linked list and what that costs. - Expecting a public, consistent bar. Apple publishes less and leaks less than its peers, so crowd-sourced lists are thinner and staler here than for any other company on this page.
Interview follow-ups
| They ask | What they're checking | The answer |
|---|---|---|
| "Tell me about this project on your CV." | Depth, and whether you actually did it | Go deep voluntarily: the design decision you would now reverse, the trade-off you got wrong, the constraint that shaped it. Three questions deep is the expected floor. |
| "Why did you choose that data structure?" | Whether the choice was reasoned or inherited | Name the operation profile you needed and the alternative you rejected. "It was already there" is an honest answer only if you follow it with what you would use now. |
| "How much memory does that use?" | Low-level awareness, on some teams | Be concrete about Python's overhead: a list of a million ints is tens of MB -- pointers plus boxed objects -- not 4 MB. |
| "What does this team build?" (you asking) | Whether you did the research | Ask it of the recruiter before the loop. Expected here, and the answer tells you which of the three Apple loops you are getting. |
Recall card
- The team matters more than the company. There is no single Apple loop.
- Ask the recruiter for the round breakdown. Expected, usually answered, and it redirects your preparation.
- Be ready to go three questions deep on your own CV -- including the parts you would rather skip.
- Low-level questions appear on some teams -- memory layout, concurrency, performance detail.
- Crowd-sourced lists are thinnest here. Weight the pattern families over the problem list more than usual.
Self-check
Why is there no single Apple interview to prepare for?
One team runs an algorithm ladder, another spends the time on systems detail, another on your past work.
Show answer
D — The team you interview with shapes the loop far more than the company does — One team runs an algorithm ladder, another spends the time on systems detail, another on your past work.
What is the best first move in Apple preparation?
Recruiters generally answer, the question is expected, and the answer redirects what you should revise.
Show answer
A — Ask the recruiter for the round breakdown and what the team builds — Recruiters generally answer, the question is expected, and the answer redirects what you should revise.
A team asks about a project on your CV. What depth should you be ready for?
Several teams weight depth on your own work heavily. Volunteering the decision you would now reverse is a strong signal.
Show answer
B — Three questions deep, including the parts you would rather skip — Several teams weight depth on your own work heavily. Volunteering the decision you would now reverse is a strong signal.