Apple Interview Questions — Page 9

Apple·Data Scientist·Technical Phone Screen

May 2026

Apple DS technical screen, basically a coding question dressed up with a lot of follow-up requirements. They wanted the full explanation of why the approach works, not just a working solution, which I wasn't totally expecting.

Given a string and an integer k, find the length of the longest substring that can be made entirely of one character by replacing at most k characters. Explain your approach, prove why it works, and handle edge cases like k=0 and very large inputs.

“The solution itself clicked pretty fast, sliding window with a running max frequency.”

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Apple·Software Engineer·Technical Phone Screen

May 2026

Apple SWE interview with a data-grouping problem that started simple and kept getting harder. The follow-up on integer-range optimization was the part that really tested whether you understood the tradeoffs or were just pattern-matching.

Given a list of (student_id, score) records, return the top three scores per student in descending order. Walk through a general solution first, then optimize for the case where scores are guaranteed integers between 0 and 100. Cover complexity, tie handling, and students with fewer than three scores.

“The general case I handled fine, grouped by student id, sorted each group descending, sliced the top three.”

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Apple·Product Manager·Onsite - Product Sense / Strategy

May 2026

Apple product sense screen, just one question but it took up the whole conversation. Felt like a trap dressed as a casual chat.

If you could improve one feature on your phone, what would it be and how?

“I blanked for a second and went straight to notifications because it felt safe.”

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Apple·Software Engineer·Technical Phone Screen

May 2026

Apple backend engineer interview, got the classic coin change problem. Nothing too surprising but it's one of those problems where you think you know it and then you second-guess yourself halfway through the implementation.

Given a list of coin denominations and a target amount, find the minimum number of coins needed to make up that amount.

“Knew it was dynamic programming pretty fast, but I fumbled the base case setup and had to backtrack.”

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Apple·Machine Learning Engineer·Onsite - System Design / Architecture

May 2026

Apple ML Engineer interview with a meaty system design question about building a full text classification pipeline from scratch, online. One question but it sprawled into like five different conversations.

Design an end-to-end pipeline that ingests a stream of text, tokenizes it online, generates embeddings, and runs a classifier on top. Walk through batching strategy, latency vs throughput trade-offs, model architecture choices, and how you'd train and monitor it in production.

“This question is deceptively wide.”

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Apple·Software Engineer·Technical Phone Screen

May 2026

Apple DV/verification engineer interview, heavy on SystemVerilog and UVM fundamentals. Ten questions back to back covering everything from fork-join semantics to constrained randomization to assertion writing. Felt more like a written exam than a conversation, but the depth they expected was real.

What is the difference between fork...join, fork...join_any, and fork...join_none in SystemVerilog, and when would you use each?
How would you use SV constraints to randomize five non-overlapping memory regions within a given address range, with optional alignment requirements?
Walk through the typical components of a UVM testbench and describe what each one does.
How do you constrain a random variable to stay within bounds, and how do you apply weighted distributions to favor certain values or ranges?
Explain class inheritance, polymorphism, and why virtual functions matter in SystemVerilog OOP.
Write SVA assertions to verify that an edge detector output pulses for exactly one cycle on a rising input transition and does not assert when the input is stable.
What does 'solve A before B' do in SV randomization, and how does adding or removing it change the resulting distribution?
What are semaphores and mailboxes in SystemVerilog, and when would you use each?
Using SV constraints, how would you generate an array of 10 unique random integers within a range? Then how would you constrain it so exactly 3 distinct values each appear twice and the remaining 4 values appear once?
How would you model drawing cards from a 52-card deck in SV so that each draw is non-repeating and uniformly distributed over remaining cards?

“Knew this one cold.”

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Apple·Machine Learning Engineer·Onsite - Coding / Algorithms

May 2026

Apple ML Engineer interview had a quirky AI coding round where you don't actually write or run any code. Instead they want you to walk through how you'd use AI tools to solve the problem, which is a pretty different format from what most companies do.

Walk through how you would use AI tools to approach and solve a coding problem, without actually writing or running any code.

“Took me a second to recalibrate because I came in expecting to actually code something.”

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Apple·Software Engineer·Technical Phone Screen

May 2026

Apple SWE interview with a string manipulation problem that looks deceptively simple but has a few edge cases that'll bite you if you're not careful. The core challenge is managing conflicts across abbreviations iteratively, which is more involved than it first appears.

Given an array of distinct strings, generate the shortest possible unique abbreviation for each word. An abbreviation is formed by taking a prefix of length k, appending the count of skipped characters, then the last character. If two words share the same abbreviation, increase the prefix length for those conflicting words until all abbreviations are unique. If an abbreviation isn't shorter than the original word, just return the original word.

“My first instinct was to precompute all abbreviations at k=1 and then resolve conflicts in a second pass, but I kept second-guessing whether I needed to re-check global uniqueness after each round of conflict resolution.”

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Apple·Software Engineer·Technical Phone Screen

May 2026

Apple SWE interview with a classic coding problem. Nothing too surprising but the pressure of the Apple name makes even familiar problems feel heavier than they should.

Find the maximum sum of a contiguous subarray within an integer array.

“Knew this one.”

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Apple·Software Engineer·Technical Phone Screen

May 2026

Apple SWE interview that mixed a classic algorithm problem with a system design follow-up. The coding part felt manageable but the scale question is where things got interesting.

Build a service that determines whether a number is a 'happy number' by repeatedly summing the squares of its digits and checking if the result eventually reaches 1.
How would you scale this service to handle billions of requests?

“The algorithm itself isn't too bad once you realize you need cycle detection to avoid infinite loops.”

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