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Interview Questions
Practice 9403 coding, system design and machine learning questions from 546 companies, sorted by role, topic and interview round. Every question has step-by-step hints, a code runner that supports 8 languages and an AI mentor; members also get the full solution walkthrough.
- 9403
- Questions
- 546
- Companies
- 11
- Topics
- 8
- Languages
Showing 1291–1320 of 9403 results
- AppleMediumSoftware EngineerFind top-k frequent elements efficiently
This question evaluates algorithmic and data-structure skills, focusing on frequency counting, heap-based selection, streaming updates, and time/space complexity analysis within the Coding & Algorithms domain.
Coding & AlgorithmsTechnical Screen - AppleMediumSoftware EngineerGenerate Tower of Hanoi moves
This question evaluates understanding of recursion, algorithmic problem decomposition, and analysis of time complexity when generating constrained move sequences.
Coding & AlgorithmsTechnical Screen - AppleMediumSoftware EngineerGive a Kubernetes Pod a Token to Call an External Service Securely
Decide how a Kubernetes pod should obtain a token for calling an external service. Tests knowledge of Secrets delivered as volumes or environment variables, RBAC and encryption at rest, external secret managers, workload identity with projected service account tokens, and rotating the token without downtime.
Software Engineering FundamentalsTechnical Screen - AppleMediumSoftware EngineerGive a Specific Motivation for Joining a Team
This question assesses the candidate's ability to articulate a clear, personal, and well-researched motivation for joining a specific engineering team, moving beyond generic company enthusiasm.
Behavioral & LeadershipOnsiteBehavioralCommunicationTeam-Fit - AppleHardData ScientistHandle conflict, priorities, and harsh clients
This English summary evaluates conflict resolution, stakeholder management, technical judgment in model selection, risk assessment, escalation, and documentation skills within a Data Scientist role, testing Behavioral & Leadership competencies in a cross-functional, client-facing context.
Behavioral & LeadershipOnsite - AppleMediumMachine Learning EngineerHow do you align ambiguous cross-functional projects?
This question evaluates communication, cross-functional collaboration, stakeholder management, project scoping under ambiguity, product-technical integration, and domain-specific experience with AI-agent-based systems and designer collaboration.
Behavioral & LeadershipTechnical Screen - AppleMediumMachine Learning EngineerHow do you prioritize and influence?
This question evaluates prioritization, stakeholder influence, resource negotiation, cross-functional collaboration, product judgment, and execution under constraints for an AI/ML engineering role.
Behavioral & LeadershipOnsite - AppleMediumSoftware EngineerHow to debug a Python loop-condition bug
This question evaluates debugging skills and understanding of loop termination and control-flow correctness in Python, emphasizing practical familiarity with debugging tools and techniques for isolating faulty loop conditions.
Software Engineering FundamentalsTechnical Screen - AppleMediumSoftware EngineerHow to root-cause Wi‑Fi chip stops after 30 minutes
This question evaluates troubleshooting and diagnostic skills for embedded wireless systems, focusing on firmware behavior, testbed instrumentation, and measurement analysis.
Software Engineering FundamentalsTechnical Screen - AppleEasyData ScientistHow would you critique this regression?
An Apple Data Scientist technical-screen statistics question that asks you to critique another analyst's linear-regression workflow for modeling website dwell time. It tests OLS assumptions (and why marginal normality of Y is not one of them), model-selection and overfitting bias from exhaustive interaction search, diagnostics and validation, and the distinction between prediction, inference, and causal goals on skewed outcome data.
Statistics & MathTechnical Screen - AppleMediumSoftware EngineerHow would you handle an unresponsive teammate?
This question evaluates interpersonal leadership and project-management competencies—including communication, accountability, escalation judgment, stakeholder risk communication, and empathy—in a software engineering, behavioral and leadership context.
Behavioral & LeadershipTechnical Screen - AppleMediumMachine Learning EngineerImplement Kubernetes Service Dependency Queries
This question evaluates proficiency with data structures and algorithms for service inventory operations, including deterministic filtering, attribute matching, graph traversal for transitive dependency resolution, and status propagation across service graphs.
Coding & AlgorithmsOnsite - AppleEasyMachine Learning EngineerImplement Masked Multi-Head Self-Attention
This question tests the ability to implement the core mechanics of a Transformer's multi-head attention mechanism, specifically focusing on linear projections, attention weight scaling, and causal masking.
Machine LearningTechnical ScreenTransformersDeep LearningAttention - AppleMediumMachine Learning EngineerImplement TF-IDF scoring for documents
This question evaluates understanding of information retrieval and text representation concepts—specifically TF–IDF weighting, tokenization, term frequency and document frequency—and measures competency in implementing an efficient scoring and ranking algorithm.
Coding & AlgorithmsTechnical Screen - AppleMediumSoftware EngineerImplement a Consistent Hashing Ring From Scratch
Implement a consistent hashing ring that maps string keys to server nodes with add, remove and lookup operations. Tests sorted-position lookup with wrap-around, deterministic hashing across processes, virtual nodes for load balance, operation complexity and how few keys move when membership changes.
Software Engineering FundamentalsTechnical Screen - AppleMediumSoftware EngineerImplement a FIFO Queue Using Two Stacks
This problem tests the ability to adapt data structure behaviors by implementing a First-In-First-Out (FIFO) queue using only Last-In-First-Out (LIFO) stacks.
Coding & AlgorithmsOnsiteData StructuresStacksQueues - AppleMediumSoftware EngineerImplement a Five-Minute Hit Counter
This problem tests your ability to design a high-throughput, time-series data structure that balances memory usage with query performance.
Software Engineering FundamentalsOnsiteData StructuresConcurrencyTime-Series - AppleHardSoftware EngineerImplement a Mutual-Exclusion Lock Without Built-In Locks
Implement a mutual-exclusion lock without any built-in lock, mutex or semaphore, relying only on atomic operations. Tests atomic read-modify-write, memory ordering, spinning versus sleeping waiters, fairness, reentrancy, and software-only mutual exclusion when atomic instructions are unavailable.
Software Engineering FundamentalsOnsite - AppleHardSoftware EngineerImplement a Reusable Cyclic Barrier from a Mutex and Condition Variables
Implement a reusable cyclic barrier from a mutex and condition variables, where a fixed number of threads block until all have arrived and are then released together. Tests round tracking for safe reuse, spurious wakeups, timeout and broken-barrier semantics, an atomics-only variant and concurrency testing.
Software Engineering FundamentalsOnsite - AppleHardSoftware EngineerImplement a Thread-Safe Bounded Blocking Queue for Producers and Consumers
Implement a thread-safe bounded blocking queue shared by multiple producer and consumer threads, built from a mutex and condition variables instead of a library concurrent queue. Tests wait and wakeup logic, spurious wakeups, FIFO ordering, shutdown handling and the OS mechanisms beneath blocking synchronization.
Software Engineering FundamentalsOnsite - AppleHardSoftware EngineerImplement a Thread-Safe Event Tracker Over a Sliding Time Window
Implement a thread-safe in-memory event tracker that records events and reports the events and their count within a sliding time window. Tests time-ordered storage with amortized eviction, window boundary semantics, lock scope and clock choice, out-of-order events, and memory under high event rates.
Software Engineering FundamentalsOnsite - AppleMediumSoftware EngineerImplement a debounce function
This problem tests your understanding of JavaScript closures, asynchronous timers, and the ability to maintain internal state across multiple function invocations.
Coding & AlgorithmsTechnical ScreenJavaScriptClosuresAsynchronous - AppleHardSoftware EngineerImplement a lazy inorder traversal iterator
This problem tests your ability to implement a binary tree iterator that performs inorder traversal using O(h) extra space, where h is the height of the tree, while maintaining an amortized time complexity of O(1) per call.
Coding & AlgorithmsTechnical ScreenTreesIteratorStack - AppleHardSoftware EngineerImplement a robust REST API method
Implement a robust REST API method evaluates requirements, scale assumptions, API/data design, architecture, trade-offs, failure modes, and rollout in a realistic interview setting. A strong answer states assumptions, handles edge cases, explains trade-offs, and shows how to validate the result clearly.
System DesignTechnical Screen - AppleMediumSoftware EngineerImplement a robust socket message reader
This question evaluates understanding of socket programming, stream message framing, internal buffer management, EOF and error handling, input size limits, unit testing, and time/space complexity analysis.
Coding & AlgorithmsTechnical Screen - AppleMediumMachine Learning EngineerImplement bag-of-words similarity search from scratch
This question evaluates knowledge and implementation skills in text processing, vector-space models, and information retrieval, covering tokenization, term-frequency and TF–IDF weighting, cosine similarity, and ranking for similarity search within the Coding & Algorithms domain.
Coding & AlgorithmsTechnical Screen - AppleMediumSoftware EngineerImplement deep clone for complex objects
This question evaluates mastery of deep object cloning, reference and memory management, and knowledge of language runtime details such as prototypes, property descriptors, symbol-keyed and non-enumerable properties, and built-in types like Maps, Sets, Dates, RegExps, and typed arrays.
Coding & AlgorithmsTechnical Screen - AppleEasySoftware EngineerImplement flood fill using BFS and DFS
This question tests the ability to implement graph traversal algorithms (BFS and DFS) on a 2D grid, focusing on boundary conditions and state management.
Coding & AlgorithmsTechnical ScreenGraphBFSDFS - AppleMediumAnalytics EngineerImplement most frequent key without using max()
Category: Coding & Algorithms — this problem evaluates frequency counting, dictionary-based aggregation, string handling, manual maximum-finding without built-in functions, and stable tie-breaking by first appearance in the input.
Coding & AlgorithmsTechnical Screen - AppleEasyData EngineerImplement most_frequent_key without using max()
This question evaluates proficiency in Python fundamentals and object-oriented inheritance, focusing on frequency aggregation using a precomputed dictionary, iteration over mappings, and correct handling of ties and empty inputs.
Coding & AlgorithmsTechnical Screen
Apple