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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
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- 546
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- 11
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Showing 841–870 of 1026 results
- Scale AIMediumSoftware EngineerDebug a Project Assignment Codebase
Tests your ability to manage state, enforce filtering rules, and maintain clean public API contracts in an asynchronous or stateful task assignment system.
Software Engineering FundamentalsOnsiteSystem DesignData StructuresState Management - Scale AIMediumSoftware EngineerDesign CSV upload endpoint with GPT classification
Implement a backend processing pipeline that parses an uploaded CSV file, enriches each text record via an external classification client, and persists structured results to a local JSON store.
Software Engineering FundamentalsOnsitePythonAPI DesignData Parsing - Scale AIMediumSoftware EngineerDesign and Simulate a Four-Player Card Game
Work through a three-stage object-oriented card game covering dealing, follow-suit trick state, configurable scoring, and deterministic tests.
Software Engineering FundamentalsTechnical Screen - Scale AIMediumSoftware EngineerImplement Hook and Modify UI Interactions
This question evaluates a candidate's ability to implement reusable React hooks, manage asynchronous data fetching with loading/error/refetch semantics, transform API responses, and wire component state for modal, collapsible list, and button-driven UI interactions.
Software Engineering FundamentalsTechnical Screen - Schneider ElectricMediumSoftware EngineerCompare JavaScript == and === operators
This question evaluates understanding of JavaScript equality semantics and type coercion, assessing a candidate's competency in language-specific comparison behavior and recognition of subtle runtime differences.
Software Engineering FundamentalsTechnical Screen - ScribdMediumSoftware EngineerProduction-Ready Event Ingestion Handler: Validation, Idempotent Writes, DLQ, Metrics
Tests your ability to write production-grade ingestion code that enforces strict schema validation, guarantees idempotent persistence, handles retries and Dead-Letter Queue (DLQ) routing, and emits operational metrics.
Software Engineering FundamentalsOnsitedata-pipelinesvalidationsystem-reliability - Shield AiEasySoftware EngineerExplain How You Would Test a System
This question evaluates your ability to design a comprehensive testing strategy for a distributed system, focusing on reliability, observability, and failure modes.
Software Engineering FundamentalsTechnical ScreenTesting StrategySystem DesignReliability - ShopifyMediumSoftware EngineerBank Account Simulation Class With Self-Written Tests at 90% Coverage
A pair-programming exercise: implement a class that simulates bank account operations, write your own tests reaching at least 90% coverage, and then extend the working code with a new requirement. It tests invariant-driven validation, all-or-nothing transfers, meaningful test design, and clean incremental changes.
Software Engineering FundamentalsTechnical Screen - ShopifyEasySoftware EngineerDesign a Robot Operations CLI
Implement a modular robot controller for a 2D warehouse grid that processes command sequences, enforces boundary and obstacle rules, and returns a detailed execution report.
Software Engineering FundamentalsTechnical ScreenSoftware EngineeringCLI DesignSimulation - ShopifyMediumSoftware EngineerHarden a URL-Caching HTTP Service for Production
This problem tests the ability to scale and harden a simple in-memory cache service, focusing on operational stability, concurrency control, and safe deployment patterns.
Software Engineering FundamentalsTechnical ScreenSystem DesignCachingConcurrency - ShopifyEasySoftware EngineerHow would you improve AI-generated code?
This question evaluates software engineering competencies such as code review, correctness and edge-case reasoning, API design and readability, test strategy, maintainability and extensibility, and performance and failure-mode analysis within the Software Engineering Fundamentals domain.
Software Engineering FundamentalsTechnical Screen - ShopifyMediumSoftware EngineerParse a CSV and Generate a Gift Exchange
This problem tests string parsing, data validation, and algorithm design by requiring the implementation of a secret-santa style matching system from unstructured CSV data.
Software Engineering FundamentalsTechnical ScreenParsingAlgorithmsRandomization - SierraMediumSoftware EngineerConversation Agent History: Paginated Fetching, Then Token-Limit Compaction
Build the message-history layer of a conversation agent: fetch the conversation page by page into one ordered list, then compact it whenever the total token count exceeds a limit by dropping the oldest messages. It tests pagination termination and ordering, running totals, and cheap removal from the front.
Software Engineering FundamentalsTechnical Screen - SierraMediumSoftware EngineerFetch Every Page from a Data API, Then Compact Records to a Token Budget
A two-part coding screen: page through a data API until it returns no more records, then, if the fetched records exceed 20,000 tokens, compact them to at most 10,000 tokens by keeping the longest contiguous run that fits. It tests loop termination, failure handling, boundary rules and an efficient way to trim data to a budget.
Software Engineering FundamentalsTechnical Screen - SierraMediumSoftware EngineerLoad a Support Chat Transcript by Pages, Then Trim to a Token Budget
Build the transcript-loading layer for a customer support chat agent: assemble a full conversation from a paginated backend into one ordered list, then trim it down whenever it grows past a token budget by dropping the oldest turns first.
Software Engineering FundamentalsTechnical Screenpaginationdata-structuresapi-design - SierraMediumSoftware EngineerPaginate an Audit-Log API, Then Compact Entries to a Byte Budget
Pull every entry out of a cursor-paginated audit-log API, then, if the entries together exceed a byte budget, keep the longest contiguous run of them (in original order) that fits. Tests correct pagination loop termination and an efficient two-pointer scan instead of re-measuring every candidate run from scratch.
Software Engineering FundamentalsTechnical Screensliding-windowpaginationapi-design - SigmacomputingMediumSoftware EngineerBuild a pivot table class over shirt sales records with running and grand totals
Implement a class that stores shirt sales records and builds pivot tables summing shirts sold by any row field and column field, then extend it with running totals and grand totals along both axes. It tests object-oriented structure, aggregation with dictionaries, deterministic layout, and consistency between cells and totals.
Software Engineering FundamentalsTechnical Screen - SnapchatHardSoftware EngineerCompare WebSocket, SSE, and long polling
This question tests a software engineer's depth in web networking fundamentals, covering real-time communication protocols and the OSI and TCP/IP models. It assesses practical knowledge of WebSocket, SSE, and long polling trade-offs, as well as understanding of how modern transport protocols like QUIC differ from TCP in multiplexing, handshake latency, and connection migration.
Software Engineering FundamentalsOnsite - SnapchatMediumSoftware EngineerDesign and Implement a Thread-Safe LRU Cache
Design an `O(1)` LRU cache and extend it with clear thread-safety semantics. The solution covers hash-map and doubly linked-list invariants, boundary cases, linearization points, single-lock correctness, sharding trade-offs, eviction callbacks, and concurrent testing.
Software Engineering FundamentalsTechnical Screen - SnapchatMediumSoftware EngineerFind Duplicate Files with a Hand-Written Directory Traversal
This problem tests iterative directory traversal techniques, efficient file hashing strategies to handle large data, and the ability to manage edge cases like file system inconsistencies or symbolic links.
Software Engineering FundamentalsTechnical ScreenFile SystemHashingIteration - SnapchatHardSoftware EngineerImplement an iOS scrollable grid with navigation
This question tests the ability to build a responsive, performance-optimized grid interface in iOS using modern frameworks like SwiftUI, focusing on layout constraints, state management, and navigation flow.
Software Engineering FundamentalsOnsiteiOSSwiftUILayout - SnapchatMediumSoftware EngineerStream Records into Clusters and Track Each Cluster's Maximum and Median
Design and implement an in-memory component that assigns each record of a data stream to an existing or a new cluster and returns the maximum value of every cluster. Follow-ups probe read and write optimizations, concurrent ingestion, and how to report each cluster's median.
Software Engineering FundamentalsOnsite - SnorkelMediumSoftware EngineerDesign SnapshotMap with Sparse Histories and Constant-Time Snapshots
Design an in-memory key-value store supporting point-in-time snapshots, sparse version histories, binary-search historical reads, tombstones, and write coalescing.
Software Engineering FundamentalsTechnical Screendata-structuresbinary-searchsystem-design - SnowflakeMediumSoftware EngineerAdapt Throne Inheritance When Initialization Does Not Supply a King
Design a throne inheritance system with an uninitialized monarch, handling dynamic root establishment, pre-order succession, and edge-case validation.
Software Engineering FundamentalsTechnical Screentreedesigndfs - SnowflakeHardSoftware EngineerBuild a Tiered Rate Limiter With Runtime-Updatable Limits, Then Test and Scale It
Build an in-memory rate limiting service in Python where clients belong to tiers such as free, pro and enterprise, tier limits change at runtime without a restart, and clients with missing or invalid tiers fall back to a global default policy. Follow-ups probe algorithm trade-offs, deterministic tests for refill timing, and a distributed design.
Software Engineering FundamentalsTechnical Screen - SnowflakeHardSoftware EngineerClarify and Prune an N-ary Tree to a Depth Limit
This problem tests tree traversal techniques and recursive state management by requiring the pruning of an N-ary tree nodes based on a depth constraint while maintaining valid structural connectivity.
Software Engineering FundamentalsTechnical ScreenTreesRecursionData Structures - SnowflakeHardSoftware EngineerCount a Distributed Tree with Nonblocking Messages
This problem tests your ability to design a distributed protocol that ensures eventual consistency and message idempotency in a tree-based network without global synchronization.
Software Engineering FundamentalsTechnical ScreenDistributed SystemsProtocolsTrees - SnowflakeMediumSoftware EngineerCount the Nodes of a Process Tree Using Only Asynchronous Messages
Each node of a tree is a separate process that can only send asynchronous messages and block on receive; write the logic that lets the root learn how many nodes exist. Follow-ups cover lost and duplicated messages, retries and idempotency, and how to structure a result that may be incomplete.
Software Engineering FundamentalsTechnical Screen - SnowflakeMediumSoftware EngineerDeep-Copy a Linked List Whose Nodes Also Carry a Random Pointer
Return a deep copy of a singly linked list in which every node also has a random pointer to any node or to nothing, so that the copy shares no node with the original. It tests mapping original nodes to copies, pointer wiring and constant-space alternatives.
Software Engineering FundamentalsTechnical Screen - SnowflakeHardSoftware EngineerDesign a Priority Task Executor with Duplicate Task IDs
This problem tests your ability to design a thread-safe task scheduler that handles duplicate task IDs while ensuring each unique task is executed exactly once based on priority and submission time.
Software Engineering FundamentalsOnsiteConcurrencyHeapsHash Maps
Scale AI
Shopify
Sierra
Snapchat
Snowflake