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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 2431–2460 of 9403 results
- CoinbaseMediumSoftware EngineerCompute Total Manual Distance
This problem tests your ability to simulate a state-based movement process and calculate cumulative distance based on a non-monotonic set of instructions.
Coding & AlgorithmsOnsiteArraysSimulationMath - CoinbaseMediumData ScientistCompute adoption, latency, and cross-region transactions
This question evaluates proficiency in SQL-based data manipulation and analytics, including calculating cohort adoption and transaction rates, performing date arithmetic for time-to-first-transaction, identifying cross-region transactions, and computing distributional percentiles.
Data Manipulation (SQL/Python)Onsite - CoinbaseMediumSoftware EngineerCompute delivery metrics and top-K queries
Compute delivery metrics and top-K queries evaluates SQL or pandas logic, joins, grouping, window functions, null handling, edge cases, and validation in a realistic interview setting. A strong answer states assumptions, handles edge cases, explains trade-offs, and shows how to validate the result clearly.
Data Manipulation (SQL/Python)Onsite - CoinbaseMediumSoftware EngineerCount users over n connections
This interview question evaluates algorithm design, data structures, correctness, complexity, edge cases, and implementation details in a realistic interview setting. A strong answer for Count users over n connections states assumptions, handles edge cases, explains trade-offs, and shows how to validate the result clearly.
Coding & AlgorithmsTechnical Screen - CoinbaseHardSoftware EngineerDebug and Extend Cursor Queries
This question evaluates understanding of iterator/cursor semantics, stateful side effects and mutation, practical debugging and trace reasoning, and basic query API design such as adding limit or order_by features.
Software Engineering FundamentalsOnsite - CoinbaseMediumSoftware EngineerDecide When Automated Tests Are Necessary
Assesses an engineer's testing philosophy, balancing risk and velocity to determine when automated tests are mandatory versus when lighter verification suffices, while looking beyond naive code coverage metrics.
Behavioral & LeadershipOnsitetesting-strategysoftware-qualityengineering-culture - CoinbaseMediumSoftware EngineerDemonstrate Senior Engineering Judgment
This question assesses a candidate's ability to balance technical debt, business deadlines, and team alignment when faced with a high-stakes, conflicting decision.
Behavioral & LeadershipOnsiteBehavioralLeadershipTrade-offs - CoinbaseMediumSoftware EngineerDescribe Code You Are Proud to Have Written
This question assesses a candidate's ability to articulate technical design choices, maintainability, and the trade-offs made during the software development lifecycle.
Behavioral & LeadershipOnsiteBehavioralSystem DesignSoftware Engineering - CoinbaseMediumSoftware EngineerDescribe cross-team collaboration on past projects
This question evaluates cross-team collaboration, stakeholder communication, conflict resolution, ownership, and coordination competencies within software delivery.
Behavioral & LeadershipTechnical Screen - CoinbaseHardSoftware EngineerDesign Crypto Order Routing
This question evaluates a candidate's ability to architect distributed, low-latency, and fault-tolerant order-placement and routing systems for cryptocurrency trading, covering consistency guarantees, external integration with heterogeneous venue protocols, fund reservation, execution reconciliation, and auditability.
System DesignOnsite - CoinbaseHardFrontend EngineerDesign Frontend Architecture for Trading UI
This question evaluates competency in frontend architecture for real-time trading UIs, covering state management, rendering strategies, real-time data flow, performance, reliability, security, testing, and observability.
System DesignOnsite - CoinbaseMediumData ScientistDesign Identity & Trust Experiment
This problem tests your ability to design a robust A/B test for a high-stakes identity verification flow, focusing on balancing security metrics with user acquisition and handling potential network interference.
Analytics & ExperimentationOnsiteA/B TestingProduct MetricsPower Analysis - CoinbaseHardSoftware EngineerDesign a Cryptocurrency Trading System with Third-Party Exchanges
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 a Cryptocurrency Trading System with Third-Party Exchanges states assumptions, handles edge cases, explains trade-offs, and shows how to validate the result clearly.
System DesignOnsite - CoinbaseMediumBackend EngineerDesign a Real-Time Asset Price Service
Design a high-throughput, low-latency price ingestion and distribution service that normalizes multi-exchange market data, reconciles conflicting ticks, and delivers live prices to internal services and retail clients.
System DesignOnsiteDistributed SystemsWebSocketsReal-Time Data - CoinbaseHardSoftware EngineerDesign a Timestamped Cloud Credit Ledger with Rebates, Merges, and History
Design an in-memory cloud credit ledger that processes top-ups, charges with delayed deterministic rebates, account merges with canonical alias resolution, historical balance lookups, and spending leaderboards.
Software Engineering FundamentalsOnline AssessmentData StructuresDesignHeap - CoinbaseHardSoftware EngineerDesign a bank account ledger
A complete take-home system-design walkthrough for a bank account ledger service: APIs and data model, an immutable double-entry ledger for auditability, ACID single-account updates and atomic multi-account transfers, idempotency and exactly-once effects, concurrency control, real-time/as-of/historical balance reads, monthly statements, reconciliation with external payment rails, limits, fraud and dispute handling, plus sharding, replicas, recovery, and monitoring strategies for scale.
System DesignOnline Assessment - CoinbaseHardSoftware EngineerDesign a basic banking system
This question evaluates understanding of transactional system design, data modeling for financial domains, API design, idempotency, concurrency control, immutable audit trails, and security considerations in an online banking context.
System DesignOnsite - CoinbaseMediumSoftware EngineerDesign a blob storage system for lunar environment
This question evaluates system design and distributed storage competencies, focusing on durability, replication, metadata management, consistency, and trade-offs under resource-constrained, high-latency conditions; it is in the System Design category and tests knowledge across distributed systems, storage architecture, and networking.
System DesignTechnical Screen - CoinbaseHardSoftware EngineerDesign a crypto trading web frontend
This question evaluates frontend system architecture skills for real-time trading applications, covering framework and tooling choices, state and data layers, WebSocket-driven real-time updates, responsive and accessible UI design, performance optimization, testing, and security; it is in the System Design (frontend) domain.
System DesignOnsite - CoinbaseMediumSoftware EngineerDesign a food delivery system
This problem tests your ability to design a distributed, real-time logistics platform, focusing on high-concurrency order placement, real-time courier tracking, and transactional integrity during payment and dispatch.
System DesignTechnical ScreenScalabilityReal-timeGeospatial - CoinbaseMediumSoftware EngineerDesign a task management system with TTL
This question evaluates the ability to design in-memory data models and algorithms for time-based task assignment semantics, including TTL-based expiration, per-user quotas, priority-based listing, and correct handling of multiple concurrent assignments and completion rules.
Software Engineering FundamentalsOnline Assessment - CoinbaseMediumData ScientistDesign an Identity Trust Experiment
This question tests your ability to design a randomized controlled trial to measure the impact of a new identity verification process on user trust and retention, while addressing potential network effects and platform bias.
Analytics & ExperimentationOnsiteExperimentationCausal InferenceA/B Testing - CoinbaseMediumSoftware EngineerDesign an in-memory database with TTL and backups
This question evaluates skills in designing and implementing in-memory data structures, TTL-based expiration, lexicographic prefix scans, and backup/restore snapshot semantics within the Coding & Algorithms domain.
Coding & AlgorithmsOnline Assessment - CoinbaseMediumSoftware EngineerDesign cloud storage system
Design cloud storage system 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 DesignOnline Assessment - CoinbaseMediumSoftware EngineerDesign crypto trading order control API
This question evaluates understanding of state management and finite-state machines, API design for lifecycle control, and implementation of in-memory data structures and transition validation in the Coding & Algorithms category.
Coding & AlgorithmsTechnical Screen - CoinbaseMediumSoftware EngineerDesign order stream with state transitions
Design order stream with state transitions 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 & AlgorithmsOnsite - CoinbaseMediumSoftware EngineerDesign query pagination for large datasets
This question tests the ability to design a scalable, consistent pagination system for high-throughput transactional data, focusing on the trade-offs between offset-based and cursor-based approaches.
System DesignOnsitePaginationDatabase IndexingAPI Design - CoinbaseHardSoftware EngineerDesign real-time crypto prices homepage
This question tests your ability to design a high-throughput, low-latency streaming architecture capable of processing volatile financial data and pushing updates to millions of concurrent users.
System DesignOnsiteReal-timeScalabilityWebSockets - CoinbaseHardSoftware EngineerDesign real-time stock price viewer
This question evaluates system-design competency in building low-latency, high-throughput real-time streaming systems, covering ingestion, normalization, deduplication, aggregation, pub/sub dissemination, and operational resilience.
System DesignOnsite - CoinbaseHardSoftware EngineerDesign scheduled payments and cancellation
A Coinbase software-engineering take-home: design a scheduled payments service that creates, lists, updates, executes, and cancels future-dated one-time and recurring transfers with exactly-once ledger correctness. It tests distributed-systems architecture, idempotent REST/gRPC API design, data modeling, concurrency control, DST handling, retries/backoff, outage backfill, and observability. The model answer pins correctness on a single-writer state machine plus an idempotent ledger.
System DesignOnline Assessment
Coinbase