System Design interview questions

Showing 241–270 of 1311 results

• Identify and fix deadlock in locked codeMedium

  Identify and fix deadlock in locked code 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.

  BoxSoftware EngineerSystem DesignOnsite
• Build AI-Assisted Full-Stack Transactions AppMedium

  This question evaluates full‑stack engineering competencies including API design, data persistence, input validation, transactional integrity for monetary data, frontend-backend integration, automated testing, and developer documentation.

  BrexSoftware EngineerSystem DesignTechnical Screen
• Design Points-from-Transactions ServiceHard

  This question evaluates system design and distributed-systems competency, focusing on transaction processing, idempotency and deduplication, monetary precision and rounding, consistency models, data modeling, and operational controls like observability and fraud prevention.

  BrexSoftware EngineerSystem DesignTechnical Screen
• Design a Peer-to-Peer Money Transfer SystemMedium

  Design a peer-to-peer money transfer product with accurate balances and history despite retries, crashes, and concurrent spending. Define APIs, transfer states, durable accounting, atomic movement, recovery, reconciliation, authorization, and the boundary between an in-memory prototype and production.

  BrexSoftware EngineerSystem DesignOnsite
• Design signup and login serviceMedium

  This question evaluates understanding of authentication system design, secure password storage practices, API endpoint and request/response modeling, database schema design, and session or token-based login state management.

  BridgeSoftware EngineerSystem DesignTechnical Screen
• Design An Ad Creative Relationship Processing SystemMedium

  This question tests your ability to design a distributed asynchronous processing pipeline that manages entity relationships, handles API retries, and maintains state consistency across multiple dependent components.

  ByteDanceSoftware EngineerSystem DesignTechnical Screen
• Design Near-Real-Time Top Songs by CountryMedium

  This question tests your ability to design a distributed streaming data pipeline that balances high-throughput ingestion with low-latency analytical queries for country-specific rankings.

  ByteDanceSoftware EngineerSystem DesignOnsite
• Design a Data Service for Downstream ConsumersMedium

  Design a centralized, governed data serving platform that provides downstream consumers with stable query APIs, schema evolution safety, cursor-based exports, and data freshness metadata.

  ByteDanceData EngineerSystem DesignHR Screen
• Design a Distributed Rate LimiterMedium

  This question tests the ability to design a scalable, low-latency rate limiting service that functions across multiple distributed application servers.

  ByteDanceSoftware EngineerSystem DesignOnsite
• Design a High-Frequency Job SchedulerMedium

  This question tests your ability to design a distributed, high-frequency job scheduling system that handles millions of tasks with varying priorities while ensuring reliability and strict execution guarantees.

  ByteDanceSoftware EngineerSystem DesignOnsite
• Design a Monitoring Dashboard with Explicit Latency GoalsMedium

  Design a monitoring dashboard that separates data freshness from query latency, with ingestion, rollups, browser updates, and stale-data handling.

  ByteDanceSoftware EngineerSystem DesignTechnical Screen
• Design a Payment System: Time-Boxed High-Level DesignMedium

  A time-boxed system design question asking for a high-level payment system that charges users through an external payment provider. It tests the end-to-end checkout flow, idempotent retries, a payment state machine and ledger, asynchronous provider notifications, reconciliation and failure handling.

  ByteDanceSoftware EngineerSystem DesignOnsite
• Design a Real-Time Auction PlatformMedium

  This question evaluates a candidate's ability to design a real-time, high-throughput distributed system focusing on API design, concurrency control, ordering guarantees, idempotency, persistence of bid history and state transitions, and real-time push/update mechanisms.

  ByteDanceSoftware EngineerSystem DesignOnsite
• Design a Synchronized Live Comment OverlayHard

  Design a live comment overlay that stays synchronized with a video during live viewing, replay, seeking, and reconnects. Explore timeline semantics, stable ordering, scalable fanout, replay queries, moderation, backpressure, and graceful degradation during traffic bursts.

  ByteDanceSoftware EngineerSystem DesignTechnical Screen
• Design a Ticket Booking System for High-Demand On-Sales Without OversellingMedium

  A system design question about a ticket booking system for high-demand on-sales. It probes how to absorb the traffic spike when sales open with load balancing, waiting rooms and rate limiting, and how to manage inventory with holds, payment-timeout release and consistent cache and database updates so that no ticket is ever sold twice.

  ByteDanceSoftware EngineerSystem DesignTechnical Screen
• Design a payment system with real-time holds, batch settlement and safe retriesMedium

  System design question: design a payment system that places real-time holds on funds and settles them in batches, then explain how retries avoid double charges. It probes idempotency at every hop, payment state machines, double-entry ledgers, consistency across an external processor, reconciliation, and recovery from specific failures.

  ByteDanceSoftware EngineerSystem DesignOnsite
• Design an E-Commerce Platform with Reliable CheckoutHard

  Design an e-commerce platform with searchable catalogs, carts, atomic inventory reservations, idempotent checkout, payment recovery, and reliable order state.

  ByteDanceSoftware EngineerSystem DesignTechnical Screen
• Design an RBAC Relational SchemaMedium

  This problem tests your ability to design a normalized relational database schema that implements Role-Based Access Control (RBAC) to support hierarchical users, roles, and resource-level permissions.

  ByteDanceSoftware EngineerSystem DesignTechnical Screen
• Evaluate a Migration from MySQL to MongoDBMedium

  Evaluate whether a MySQL-backed service should migrate to MongoDB using its actual workload and correctness needs. Compare relational and document models, joins and transactions, then outline a dual-run migration, rollback plan, and measurements that would prove an improvement.

  ByteDanceSoftware EngineerSystem DesignTechnical Screen
• Model Campaigns, Targeting, and Edit History for a Demand-Side Ad PlatformMedium

  Model a demand-side ad platform with advertisers, campaigns, ad groups, ads, and creatives, including audience rules, edit history, and versioned publishing.

  ByteDanceSoftware EngineerSystem DesignOnsite
• Prevent a Cache Stampede on a Hot KeyMedium

  This question tests the ability to design robust cache-aside mechanisms to prevent database overload during cache expiration events for high-traffic keys.

  ByteDanceSoftware EngineerSystem DesignTechnical Screen
• Trace and Debug Agent Tool-Call FailuresMedium

  Design a distributed observability and tracing system to monitor, debug, and diagnose multi-step agent tool-call failures across retries and execution stages without leaking sensitive data.

  ByteDanceSoftware EngineerSystem DesignTechnical Screen
• Design a restaurant reservation systemEasy

  This question evaluates skills in system architecture and engineering, including data modeling, API design, concurrency control to prevent double-booking, availability and scheduling logic, scalability under traffic spikes, and operational concerns like auditability and low-latency queries.

  C3 AISoftware EngineerSystem DesignOnsite
• Card Issuer Backend: Fast Purchase Approvals and a Secure PII VaultMedium

  Design the issuer-side platform that approves or declines card purchases in tens of milliseconds, settles them later, and stores cardholder identity data so a breach of any one service exposes as little as possible.

  Capital OneSoftware EngineerSystem DesignTechnical Screen
• Design a Buy-Now-Pay-Later Checkout Backend: Latency and PII StorageMedium

  Design the backend of a buy-now-pay-later checkout financing service that approves or declines a purchase in real time against a shopper's revolving credit line, then go deep on latency budgeting for the decision and on securely storing borrowers' personal data.

  Capital OneSoftware EngineerSystem DesignTechnical Screen
• Design a Credit Card System: Authorization Latency and Sensitive Data StorageMedium

  A system design question that asks for the backend of a credit card system, then goes deep on what payment authorization latency is reasonable and how to achieve it, and on how to store cardholders' sensitive personal information. It tests transaction flow design, available-credit concurrency, latency budgeting, and data protection.

  Capital OneSoftware EngineerSystem DesignTechnical Screen
• Design a Credit Card System: Authorization, Fraud, Bureau Reports, Limit IncreasesMedium

  A system design question for a credit card platform covering customer login, real-time payment authorization with fraud checks, monthly credit bureau reporting, a spending overview, and instant credit limit increase decisions. It tests laying out entities, services and read and write paths before choosing deep dives.

  Capital OneSoftware EngineerSystem DesignTechnical Screen
• Design a highly reliable account balance systemMedium

  This question evaluates a candidate's ability to architect a highly reliable transactional account-balance service, testing competencies in data modeling and storage choice, API design for idempotency, concurrency and consistency mechanisms, replication/failover, partitioning for scale, and auditability.

  Capital OneSoftware EngineerSystem DesignOnsite
• Design a scalable banking systemHard

  This question evaluates system design skills focused on distributed systems architecture, transactional integrity, strong consistency models, security and authentication, external payment and ATM integrations, data modeling, API design, concurrency control, and operational monitoring for financial platforms.

  Capital OneSoftware EngineerSystem DesignOnsite
• Design an Enterprise Agent Platform with Guardrails and Latency ControlMedium

  Design an enterprise agent platform with durable execution, deliberate workflow-versus-agent choices, enforceable tool guardrails, and a dependency-aware latency plan.

  Capital OneSoftware EngineerSystem DesignOnsite