Coupang interview questions

Showing 1–11 of 11 results

• Anagram Group Tracker with Add, Remove, and Largest-Group Queries: Read vs Write Trade-offsMedium

  Design an in-memory data structure that supports adding words, removing words, and querying the largest anagram group. Tests canonical key generation, dynamic maximum maintenance, and read-versus-write algorithmic trade-offs.

  CoupangSoftware EngineerSoftware Engineering FundamentalsOnsite
• Describe your proudest project and dive deepMedium

  This interview question evaluates behavioral evidence, ownership, communication, trade-offs, and measurable outcomes in a realistic interview setting. A strong answer for Describe your proudest project and dive deep states assumptions, handles edge cases, explains trade-offs, and shows how to validate the result clearly.

  CoupangSoftware EngineerBehavioral & LeadershipOnsite
• Design a PKI for internal mTLS and certificatesMedium

  This question evaluates a candidate's competency in PKI architecture, cryptographic key management, certificate lifecycle (issuance, renewal, revocation), and operational security for internal mTLS and related signing use cases.

  CoupangSoftware EngineerSystem DesignOnsite
• Design an IAM system for services and usersMedium

  This question evaluates understanding of Identity and Access Management concepts including authentication and authorization flows, role- and policy-based permissions, temporary credential handling, multi-tenant access control, auditing, and scalability considerations.

  CoupangSoftware EngineerSystem DesignOnsite
• Design large video upload for a YouTube-like appMedium

  This question evaluates a candidate's ability to design scalable, reliable large-file upload subsystems, testing competencies in distributed storage, resumable transfers, data integrity, processing pipelines, security, and observability.

  CoupangSoftware EngineerSystem DesignOnsite
• Find shortest distance between two islandsMedium

  This question evaluates understanding of grid-graph traversal and shortest-path concepts, including identification of connected components and reasoning about minimal bridging distance between regions.

  CoupangSoftware EngineerCoding & AlgorithmsOnsite
• Find the Closest Value in a Binary Search TreeEasy

  This question tests your ability to traverse a binary search tree efficiently by leveraging its ordering property to find the node value closest to a given target number.

  CoupangSoftware EngineerCoding & AlgorithmsTechnical Screen
• Monthly Cohort RetentionMedium

  This question tests the ability to transform raw user activity logs into a cohort retention matrix by calculating the time elapsed between a user's first interaction and subsequent activity.

  CoupangData ScientistData Manipulation (SQL/Python)Technical Screen
• Predicting the Next Elevator Call LocationMedium

  This question tests the ability to design a spatio-temporal forecasting system to predict future elevator call locations, focusing on feature engineering, model selection, and handling data sparsity.

  CoupangData ScientistMachine LearningTechnical Screen
• Reserving an Elevator for Food DeliveriesMedium

  This question evaluates your ability to design an A/B test for an operational policy change in a high-traffic environment, focusing on cluster randomization, metric selection, and handling network effects.

  CoupangData ScientistAnalytics & ExperimentationTechnical Screen
• Walk Through Your Proudest Project, What Made It Special, and What You Would ChangeMedium

  Behavioral project deep-dive for software engineers: describe the project you are proudest of, what made it distinctive, what you learned, and what you would do differently. It tests concise storytelling, clear personal ownership, technical depth, measurable results, and honest self-reflection on past decisions.

  CoupangSoftware EngineerBehavioral & LeadershipOnsite