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Software Engineer 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
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- 11
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- 8
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Showing 2401–2430 of 2810 results
- SnowflakeMediumSoftware EngineerTransform tree with subtree sum mapping
Transform tree with subtree sum mapping evaluates algorithm design, data structures, correctness, complexity, edge cases, and implementation details in a realistic interview setting. A strong answer states assumptions, handles edge cases, explains trade-offs, and shows how to validate the result clearly.
Coding & AlgorithmsTechnical Screen - SnowflakeMediumSoftware EngineerTraverse All Reachable Pages With Parallel BFS
Implement a concurrent breadth-first web crawler that discovers all reachable pages from a start URL. The crawler must fetch pages concurrently while maintaining deterministic level-order output and safely handling cycles and fetch errors.
Coding & AlgorithmsTechnical ScreenBreadth-First SearchConcurrencyGraph - SoFiMediumSoftware EngineerAnswer Leadership Scenario Questions
This question assesses a candidate's ability to navigate conflicting priorities, advocate for technical excellence, and handle stakeholder management when product roadmaps shift unexpectedly.
Behavioral & LeadershipTechnical ScreenLeadershipStakeholder ManagementConflict Resolution - SoFiEasySoftware EngineerCount completed car journeys from sensor logs
This question evaluates stateful event-stream processing and per-entity state management, testing the ability to track and reconcile time-ordered sensor events while handling edge cases like unmatched or spurious events.
Coding & AlgorithmsTechnical Screen - SoFiMediumSoftware EngineerDemonstrate project impact and teach something
This question evaluates a candidate's ability to articulate project impact, demonstrate technical leadership, reason about design trade-offs, present measurable outcomes, and teach a technical concept clearly and contextually.
Behavioral & LeadershipTechnical Screen - SoFiMediumSoftware EngineerDesign a key-value store with getLast
Design a key-value store with getLast evaluates algorithm design, data structures, correctness, complexity, edge cases, and implementation details in a realistic interview setting. A strong answer states assumptions, handles edge cases, explains trade-offs, and shows how to validate the result clearly.
Coding & AlgorithmsTechnical Screen - SoFiMediumSoftware EngineerExplain GC, singleton, and OOP principles
This question evaluates understanding of Java runtime memory management (generational garbage collection, marking, compaction), software design patterns (Singleton), and object-oriented design and SOLID principles, testing competencies in performance reasoning, concurrency and thread-safety considerations, design trade-offs, and maintainability.
Software Engineering FundamentalsTechnical Screen - SoFiEasySoftware EngineerFind Smallest Common Row Value
This question evaluates algorithmic problem-solving skills focused on array processing, intersection across multiple sorted sequences, and time/space complexity analysis.
Coding & AlgorithmsTechnical Screen - SoFiMediumSoftware EngineerFind the second most frequent tag
This question evaluates a candidate's ability to perform frequency analysis and stable tie-breaking on a linear sequence, exercising skills in hashing, counting, and handling edge cases such as equal frequencies.
Coding & AlgorithmsTechnical Screen - SoFiMediumSoftware EngineerFormat words into wrapped/justified lines
This problem tests your ability to implement a greedy word-wrapping algorithm that packs words into lines of a fixed width while managing spacing constraints.
Coding & AlgorithmsTechnical ScreenStringsGreedyArray - SoFiMediumSoftware EngineerImplement a multithreaded task executor with semaphores
This question evaluates understanding of concurrent programming, thread-safety, semaphore-style resource management, exception-safe permit release, and extensible API design, and it falls under the Coding & Algorithms category testing concurrency/multithreading, synchronization primitives, and resource management.
Coding & AlgorithmsTechnical Screen - SoFiEasySoftware EngineerReturn All Nodes Reachable from a Starting Vertex
This problem tests your ability to perform a graph traversal (BFS or DFS) to identify all reachable nodes from a specified starting point in an undirected graph.
Coding & AlgorithmsTechnical ScreenGraphsBFSDFS - SoFiHardSoftware EngineerScale a key-value store with consistent hashing
Scale a key-value store with consistent hashing 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 - SocureHardSoftware EngineerImplement a Concurrent Payment Queue with Visibility Timeouts
Implement a thread-safe in-memory payment queue supporting atomic message consumption, visibility timeouts, receipt-handle validation to prevent stale ACKs, and idempotent submissions.
Software Engineering FundamentalsTechnical ScreenConcurrencyData StructuresMessage Queues - SonatusHardSoftware EngineerCompute days until a higher reading
This question evaluates proficiency in array processing and the next-greater-element concept, measuring algorithmic reasoning about sequence traversal, comparisons, and managing time/space trade-offs.
Coding & AlgorithmsTechnical Screen - SonatusHardSoftware EngineerDesign a RAG system for vehicle documents
This question evaluates a candidate's ability to design a Retrieval-Augmented Generation system, testing competencies in information retrieval, vector search, document ingestion and chunking, metadata modeling, citation handling, security, observability, and scalability within the system design and NLP/information-retrieval domain.
System DesignTechnical Screen - SpacexEasySoftware EngineerAlign Telemetry Streams and Publish Versioned Corrections
Define telemetry subtraction semantics, handle missing or repeated timestamps, and reconcile late events with versioned, idempotent corrections.
Software Engineering FundamentalsTechnical Screen - SpacexEasySoftware EngineerDebug Missing Output from a Python Multiprocessing Pool
Diagnose and fix issues in a Python multiprocessing script where asynchronous workers fail to produce output, addressing pool lifecycle management, exception propagation, and centralized file I/O.
Software Engineering FundamentalsTechnical Screenpythonmultiprocessingconcurrency - SpacexMediumSoftware EngineerDynamic Island Counts
Report the exact island count after each land addition by tracking only activated cells and merging distinct neighboring components efficiently.
Coding & AlgorithmsTechnical Screen - Sprinter HealthMediumSoftware EngineerDesign a Game Store with Purchases, Downloads, and Reviews
Design connected game-store pages for category browsing, purchases, authorized downloads, and reviews with consistent data and retry behavior.
System DesignTechnical Screen - SquareHardSoftware EngineerImplement transaction network queries
This question evaluates the ability to model and query dynamic graph connectivity and reachability for pairwise transactions, testing competencies in graph representation, dynamic data structures, and reachability queries within the Coding & Algorithms domain and emphasizing practical application of algorithmic concepts.
Coding & AlgorithmsTechnical Screen - SquareEasySoftware EngineerList the Two-by-Two Blocks Covering Each Black Cell
This problem tests your ability to navigate grid coordinates, implement range boundaries, and perform efficient dictionary-based data collection.
Coding & AlgorithmsTechnical ScreenArraysHash MapsGrid - SquarepointMediumSoftware EngineerEvaluate Linear Regression Assumptions and Fit Three Points
Discuss the assumptions behind ordinary least squares, how multicollinearity affects a fitted model, and practical ways to address multicollinearity and overfitting. Cover data and labels, leakage-safe features, baselines and model choice, offline evaluation, deployment constraints, monitoring, and drift.
Machine LearningTechnical Screen - SquarepointMediumSoftware EngineerFind the Correlation Between Two Die-Face Counts
A fair six-sided die is rolled independently `n` times, where `n` is a fixed positive integer. Explain the assumptions and derivation clearly, check edge cases, and show how the result changes when those assumptions no longer hold.
Statistics & MathTechnical Screen - SquarepointHardSoftware EngineerImplement and Improve React Components
Implement and Improve React Components evaluates requirements, assumptions, structured reasoning, trade-offs, and verification in a realistic interview setting. A strong answer states assumptions, handles edge cases, explains trade-offs, and shows how to validate the result clearly.
Software Engineering FundamentalsTechnical Screen - StackAdaptEasySoftware EngineerDesign a Recipe and Inventory Ordering Service
Design an object-oriented recipe service where nested dishes consume raw inventory and an order either succeeds atomically or changes nothing. The prompt tests typed references, cycle detection, quantity expansion, overflow handling, concurrent stock updates, immutable views, and explicit replacement and query semantics.
Software Engineering FundamentalsTechnical Screen - StackAdaptEasySoftware EngineerDesign a time-windowed key-value store
This question evaluates a candidate's ability to design efficient data structures and algorithms for a time-windowed key-value store, focusing on expiration handling, update semantics, and maintaining aggregate metrics under memory constraints.
Coding & AlgorithmsTechnical Screen - StravaMediumSoftware EngineerFirst Climb in Elevation Samples, Strict and With a Tolerated Partial Descent
Given elevation samples taken at regular intervals, return the start and end indices of the first climb, first under strict rules where elevation may never drop and then allowing a temporary descent limited to a fraction of the gain so far. Tests precise index semantics, lookahead and careful state tracking.
Coding & AlgorithmsTechnical Screen - StripeMediumSoftware EngineerAnswer hiring manager behavioral questions
This question evaluates behavioral competencies such as communication, teamwork, collaboration, problem-solving, decision-making under pressure, self-assessment, and alignment with professional values.
Behavioral & LeadershipTechnical Screen - StripeMediumSoftware EngineerAssign tasks to workers with types and accounts
This problem tests the ability to manage task scheduling with specific affinity constraints and varying worker processing times using an efficient priority-based simulation.
Coding & AlgorithmsTechnical ScreenAlgorithmsSchedulingPriority Queue
Snowflake
SoFi
Square
Squarepoint
StackAdapt
Stripe