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System Design 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 31–60 of 1311 results
- AirwallexMediumBackend EngineerDesign a Hotel Booking Platform Down to the SQL Tables and Booking Transaction
Design a hotel booking platform where travelers search by destination and dates and book rooms, down to the SQL tables and the booking transaction. Tests schema design with real constraints, preventing double booking under concurrency, payment holds and expiry, and a search path that scales separately.
System DesignOther - AirwallexMediumSoftware EngineerDesign a Large-File Analysis Report System
Tests system design skills in architecting a secure, multi-tenant pipeline for large file ingestion and asynchronous batch analytics with resumable uploads and idempotent job processing.
System DesignTechnical ScreenObject StorageDistributed SystemsIdempotency - AirwallexMediumFrontend EngineerDesign a Reusable React Autocomplete Input: API, Portals, Debounce and Caching
Design a reusable autocomplete search input for a React application on top of an existing search API. The discussion covers the API contract with pagination and limits, the component and portal architecture, throttling versus debouncing, client-side result caching strategies, and the public props and exports.
System DesignTechnical Screen - Akuna CapitalHardSoftware EngineerDesign an order-matching engine
This question evaluates a candidate's ability to design a high-throughput, low-latency in-memory limit order-matching engine, testing competencies in data structure selection, algorithmic complexity, deterministic concurrency, API design, and handling domain-specific constraints such as self-trade prevention.
System DesignTechnical Screen - Akuna CapitalEasySoftware EngineerDesign user communication functions
This interview question evaluates requirements, scale assumptions, API/data design, architecture, trade-offs, failure modes, and rollout in a realistic interview setting. A strong answer for Design user communication functions states assumptions, handles edge cases, explains trade-offs, and shows how to validate the result clearly.
System DesignOnline Assessment - Akuna CapitalHardSoftware EngineerFix and harden an object pool
This interview question evaluates requirements, scale assumptions, API/data design, architecture, trade-offs, failure modes, and rollout in a realistic interview setting. A strong answer for Fix and harden an object pool states assumptions, handles edge cases, explains trade-offs, and shows how to validate the result clearly.
System DesignOnline Assessment - Akuna CapitalMediumSoftware EngineerImplement a two-user communications handler
This question evaluates skills in stateful resource management, API and abstraction design, custom exception handling, and input validation for enforcing a single-active connection between two users.
System DesignOnline Assessment - AlibabaMediumSoftware EngineerIdempotent Kafka Consumer: Duplicate Writes, Offset Commits and a Second Database
A backend design discussion on making a concurrent Kafka consumer idempotent: how to stop duplicate effects when the same message is processed twice, whether a duplicate write should throw or return the existing data, how offsets keep advancing, and how to keep a second database consistent when publishing fails.
System DesignTechnical Screen - AltruistHardSoftware EngineerDesign scalable rate limiter with token bucket
This question evaluates understanding of rate-limiting algorithms and scalability concepts, specifically comparing sliding-window and token-bucket approaches with attention to lazy refill, per-client state modeling, memory efficiency, concurrency, and extendability to distributed systems.
System DesignTechnical Screen - AmazonMediumSoftware EngineerAccept Notification Bursts With Low Latency
Design a high-throughput, low-latency notification ingestion and delivery service capable of absorbing sudden 10x traffic spikes while maintaining strict delivery SLOs and downstream rate limits.
System DesignTechnical ScreenDistributed SystemsMicroservicesMessage Queues - AmazonMediumSoftware EngineerArchitect an AI Chatbot for Enterprise Users
This question tests your ability to design a scalable, enterprise-grade AI chatbot system that handles high throughput, ensures data privacy, and integrates with existing business data stores.
System DesignTechnical ScreenRAGScalabilityAccess Control - AmazonMediumSoftware EngineerDesign Faceted Product Search at Large Scale
Design a scalable e-commerce product search engine supporting full-text query matching, multi-attribute filtering, dynamic facet aggregations, and near real-time updates for volatile data like price and inventory.
System DesignOnsiteSearchDistributed SystemsInformation Retrieval - AmazonMediumSoftware EngineerDesign Human Avoidance for Warehouse Robots
This problem evaluates your ability to design a real-time sensor-to-actuator pipeline for an autonomous robot, focusing on latency, sensor fusion, and safety-critical path adjustments.
System DesignTechnical ScreenRoboticsSensor FusionReal-time Systems - AmazonMediumSoftware EngineerDesign Music Search, Playlists, and Playback Controls
This problem tests the ability to design a scalable music streaming architecture, focusing on data modeling for search indices, conflict resolution in distributed state management, and robust API design for real-time playback control.
System DesignOnsiteDistributed SystemsAPIsConcurrency - AmazonMediumSoftware EngineerDesign Sent, Delivered and Read Receipts for a Mobile Messaging App
A system design question about the sent, delivered and read indicators in a large mobile messaging app, for one-to-one and group chats. It tests how status updates travel from the recipient's device back to the sender, offline and multi-device behaviour, keeping status monotonic, and controlling the volume of status events.
System DesignOther - AmazonHardSoftware EngineerDesign Thread-Safe Tagging and Bookstore Systems
This interview question evaluates requirements, scale assumptions, API/data design, architecture, trade-offs, failure modes, and rollout in a realistic interview setting. A strong answer for Design Thread-Safe Tagging and Bookstore Systems states assumptions, handles edge cases, explains trade-offs, and shows how to validate the result clearly.
System DesignOnsite - AmazonHardSoftware EngineerDesign VPC, IP plan, management, storage, SSO
This interview question evaluates requirements, scale assumptions, API/data design, architecture, trade-offs, failure modes, and rollout in a realistic interview setting. A strong answer for Design VPC, IP plan, management, storage, SSO states assumptions, handles edge cases, explains trade-offs, and shows how to validate the result clearly.
System DesignTechnical Screen - AmazonHardSoftware EngineerDesign a Core Dump Collection and Analysis System
This problem tests the ability to design a distributed, scalable ingestion and analysis pipeline for massive binary crash files while maintaining system performance and data availability.
System DesignOnsiteDistributed SystemsScalabilityStorage - AmazonMediumSoftware EngineerDesign a Distributed Cron Job Scheduler
Design a fault-tolerant, horizontally scalable distributed cron scheduler capable of triggering millions of recurring tasks with at-least-once delivery semantics and deterministic run coordination.
System DesignOnsiteDistributed SystemsSchedulingFault Tolerance - AmazonMediumSoftware EngineerDesign a Distributed In-Memory Cache: Partitioning, Failover and Invalidation
Design a distributed in-memory cache shared by many services in front of a database, covering single-node eviction and expiry, key partitioning and rebalancing, replication and failover, and keeping cached values consistent after writes. It also probes protection against miss stampedes and hot keys.
System DesignOther - AmazonHardSoftware EngineerDesign a Distributed Job Scheduler with Run Logs and Exactly-Once Execution
Design a highly available distributed job scheduler that handles one-time and recurring jobs, collects execution logs, and rigorously addresses the practical boundaries of exactly-once execution.
System DesignOnsitesystem-designdistributed-systemsconcurrency - AmazonHardSoftware EngineerDesign a High-Availability Load Balancer
This problem tests the ability to architect a highly available, scalable Layer 7 load balancer, focusing on fault tolerance, traffic distribution strategies, and system reliability.
System DesignOnsiteDistributed SystemsLoad BalancingHigh Availability - AmazonMediumSoftware EngineerDesign a Kafka-Based File Watcher for Millions of Files
Design a Kafka file watcher for millions of files with source sharding, durable events, per-file ordering, missed-event reconciliation, and version-aware reads.
System DesignTechnical Screen - AmazonHardSoftware EngineerDesign a Library Management System (API and Schema)
This problem evaluates your ability to design a schema and API for a transactional library system, focusing on handling concurrent checkouts and maintaining data integrity in a read-heavy environment.
System DesignTechnical ScreenDatabase ModelingConcurrencyREST API - AmazonMediumSoftware EngineerDesign a Low-Latency Ad Serving Backend With Targeting, Budgets and Tracking
An Amazon system design question: design an ad server that selects and returns an ad for each page request within a tight latency budget. It covers targeting and candidate retrieval, ranking and auctions, budget enforcement and pacing, impression and click tracking, and failure handling.
System DesignOnsite - AmazonMediumSoftware EngineerDesign a Multi-Branch Library Lending System
This problem tests the ability to design a distributed inventory and reservation system, focusing on concurrency control, transaction integrity across branches, and fault-tolerant service communication.
System DesignTechnical ScreenConcurrencyDistributed SystemsInventory - AmazonMediumSoftware EngineerDesign a Multi-Provider Financial Dashboard
Design a financial dashboard that reconciles balances, securities, cryptocurrency, prices, and derived metrics from unreliable external providers. Explain freshness, historical reproducibility, permissions, corrections, outages, and how users can recognize partial or inconsistent data.
System DesignOnsite - AmazonMediumSoftware EngineerDesign a Perishable-Goods Inventory and Location Tracking System
This question tests the ability to design a distributed inventory system that handles high-frequency location updates and strict FIFO/expiry logic for perishable goods.
System DesignTechnical ScreenGeo-spatialScalabilityDatabase Modeling - AmazonMediumSoftware EngineerDesign a Product Image Upload Pipeline for Sellers
Design an asynchronous, distributed image processing and delivery pipeline for an e-commerce seller portal, focusing on direct-to-cloud uploads, state management, moderation workflows, and resilient global caching.
System DesignOnsitesystem-designdistributed-systemsevent-driven - AmazonMediumSoftware EngineerDesign a Ride-Hailing Matching System
This question evaluates competence in large-scale real-time system design, covering high-throughput ingestion and burst absorption, stream deduplication, geospatial indexing, and low-latency matching and caching for ride-hail workflows.
System DesignOnsite
Airwallex
Akuna Capital
Alibaba
Amazon