ByteDance interview questions

Showing 31–60 of 160 results

• Count Special Subarrays by Modular FrequencyHard

  This question evaluates the ability to apply modular arithmetic, frequency tracking, and prefix-count reasoning to efficiently count subarrays that satisfy a congruence condition, testing algorithmic problem-solving and scalable complexity management.

  ByteDanceMachine Learning EngineerCoding & AlgorithmsOnsite
• Count Target-Sum Paths in an N-ary TreeHard

  This problem tests the ability to navigate tree structures and use hash maps to track cumulative path sums efficiently, specifically in the context of an N-ary tree.

  ByteDanceSoftware EngineerCoding & AlgorithmsTechnical Screen
• Course Schedule FeasibilityHard

  This problem tests the ability to detect cycles in a directed graph using topological sorting or Depth First Search, ensuring all task dependencies can be resolved.

  ByteDanceSoftware EngineerCoding & AlgorithmsOnsite
• Debug and Extend a Priority-Aware Python Thread PoolEasy

  This question tests your understanding of thread-safe synchronization primitives, priority queues, and robust resource management in a multi-threaded Python environment.

  ByteDanceSoftware EngineerSoftware Engineering FundamentalsOnsite
• Defend a Project's Schema, Indexes, and Concurrency ModelMedium

  Practice defending a database design by connecting schema choices, indexes, consistency behavior, and concurrency controls to concrete access patterns. The solution explains how to reason about CAP trade-offs, lost-update prevention, transaction boundaries, and the operational cost of each index.

  ByteDanceSoftware EngineerSoftware Engineering FundamentalsTechnical Screen
• Describe Over-Engineering and UX WinsEasy

  This question evaluates engineering judgment, trade-off analysis, and product-oriented UX skills by probing examples of over-engineering and measurable user-experience improvements.

  ByteDanceSoftware EngineerBehavioral & LeadershipTechnical Screen
• Describe your key projects and impactMedium

  Prepare TikTok platform PM behavioral deep-dive answers for self-introduction, successful projects, ownership, difficulties, scale, strengths, weaknesses, job changes, and team fit. The solution emphasizes STAR storytelling, platform impact, metrics, and positive motivation.

  ByteDanceProduct ManagerBehavioral & LeadershipTechnical Screen
• Describe your most challenging project and leadershipMedium

  This question evaluates leadership, project management, technical problem-solving, decision-making, and communication competencies by probing project goals, constraints, specific responsibilities, trade-offs, and outcomes.

  ByteDanceSoftware EngineerBehavioral & LeadershipTechnical 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 Self-Dealing Detection for MarketplacesMedium

  This question evaluates competency in machine learning system design for fraud detection, focusing on modeling buyer–seller–item–transaction relationships, feature engineering across graph, temporal, behavioral and account-linking signals, and production concerns; it is in the ML System Design domain and emphasizes practical application and system-level architecture over purely theoretical concepts. It is commonly asked to assess a candidate’s ability to reason about data collection and labeling, model and rule trade-offs, evaluation metrics, scalability and deployment trade-offs when detecting coordinated or self-dealing activity in marketplace environments.

  ByteDanceMachine Learning EngineerML System DesignTechnical Screen
• Design a C++ Shared-Ownership Pointer LibraryMedium

  Explain shared-pointer control blocks, copy and move semantics, lifetime invariants, exception safety, and the limits of reference counting.

  ByteDanceSoftware EngineerSoftware Engineering FundamentalsTechnical Screen
• Design a Configurable Order Validator with DAG DependenciesHard

  This problem tests your ability to design a flexible, extensible rule-processing engine that handles sequential and interdependent validation logic.

  ByteDanceSoftware EngineerSoftware Engineering FundamentalsTechnical Screen
• Design a Content Moderation PlatformMedium

  This problem evaluates your ability to design a scalable, multi-modal content moderation system that filters user-uploaded media using both automated ML inferences and human review workflows.

  ByteDanceSoftware EngineerML System 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 RAG-Based Agent SystemMedium

  This question tests the ability to architect a scalable Retrieval-Augmented Generation (RAG) system that handles document indexing, retrieval, and multi-step reasoning while maintaining low latency and data freshness.

  ByteDanceSoftware EngineerML System DesignTechnical Screen
• 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 Short-Video Recommendation SystemMedium

  This problem tests the ability to design a multi-stage recommendation pipeline that balances real-time personalization, system latency, and content diversity.

  ByteDanceSoftware EngineerML System 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 Agent-Orchestrated QA Pipeline from Requirements to Test ReportMedium

  Design an end-to-end multi-agent QA platform that autonomously transforms feature requirements into validated test cases, synthetic data, executable test scripts, and traceable execution reports with human-in-the-loop oversight.

  ByteDanceSenior SDE, Quality Platform & AI Test AutomationML System DesignTechnical Screen
• 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 Enterprise Tool-Using AgentMedium

  This question evaluates a candidate's ability to design production-grade LLM agents that integrate external tools, manage long-running and branching workflows, persist complex state, and ensure safety, observability, and reliable evaluation in enterprise settings.

  ByteDanceMachine Learning EngineerML System 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
• Detect a Pythagorean Triple in an Integer ArrayMedium

  This problem tests the ability to optimize a brute-force approach into an efficient search using sorting and the two-pointer technique to satisfy a geometric condition.

  ByteDanceSoftware EngineerCoding & AlgorithmsOnsite