eBay interview questions

Showing 31–41 of 41 results

• Length of the Longest Contiguous Subarray Summing to a TargetEasy

  Given an integer array that may contain negative numbers and a target k, return the length of the longest contiguous subarray whose sum equals k, or 0 when none exists. Tests reasoning about subarray sums with mixed signs and handling large inputs efficiently.

  eBaySoftware EngineerCoding & AlgorithmsTechnical Screen
• Named entity recognition: framing, algorithm choice, data processing, and metricsEasy

  A machine learning question on named entity recognition for short e-commerce text such as listing titles and search queries. It asks you to define the task, compare NER algorithm families and choose one, plan labeling and data processing, and select entity-level and product-level metrics.

  eBayApplied ScientistMachine LearningTechnical Screen
• Optimizing BERT inference latency and throughput for a production NLP serviceEasy

  An ML engineering question on speeding up a fine-tuned BERT encoder that has become too slow or too costly to serve in production. It tests profiling, model compression, runtime and serving optimizations such as batching and padding control, and how to verify that accuracy does not regress.

  eBayApplied ScientistMachine LearningTechnical Screen
• Pass functions and analyze basic data structuresMedium

  This question evaluates proficiency with higher-order functions, passing functions or delegates, closures, and reasoning about side effects, alongside the ability to analyze fundamental data structures and their performance characteristics.

  eBaySoftware EngineerCoding & AlgorithmsOnsite
• Rebuild a Binary Tree from Two Traversals and Serialize It Level by LevelMedium

  Given the preorder and inorder traversals of a binary tree with distinct values, rebuild the tree and return its level-order serialization, with empty slots marked as None and trailing ones removed. It tests understanding of traversal orders, careful index bookkeeping and an efficient solution for trees with thousands of nodes, including fully skewed ones.

  eBaySoftware EngineerCoding & AlgorithmsTechnical Screen
• Resolving a Technical Conflict with a ColleagueMedium

  This question assesses a candidate's ability to navigate technical disagreements through objective analysis, collaborative communication, and post-decision reflection.

  eBaySoftware EngineerBehavioral & LeadershipOnsite
• Return the K Smallest Values from Sorted ArraysMedium

  Tests ability to efficiently merge multiple sorted streams to extract the k smallest elements using a min-heap or frontier-based approach. Evaluates handling of empty arrays, duplicates, and computational complexity dependent on the number of arrays rather than total elements.

  eBaySoftware EngineerCoding & AlgorithmsTechnical Screen
• Search a Rotated Sorted Array in One Binary-Search PassMedium

  Implement a single-pass binary search to locate a target value in a rotated strictly increasing array in logarithmic time and constant auxiliary space.

  eBaySoftware EngineerCoding & AlgorithmsTechnical Screen
• Solve Dependency, Prefix, and Cache ProblemsMedium

  This set of problems evaluates graph algorithms for dependency and cycle detection, efficient data structure design for prefix-based word storage, and cache eviction policy implementation, assessing skills in algorithmic analysis, data structures, and time/space complexity within the Coding & Algorithms domain.

  eBaySoftware EngineerCoding & AlgorithmsOnsite
• Why eBay and your weakness?Medium

  Prepare eBay Senior PM behavioral answers for why eBay, a genuine weakness, and cross-functional product execution. The solution ties motivation to two-sided marketplace tradeoffs, buyer trust, seller success, humility, stakeholder alignment, and measurable outcomes.

  eBayProduct ManagerBehavioral & LeadershipOnsite
• Wildcard Dictionary MatchingMedium

  This problem tests your ability to implement a pattern-matching algorithm that supports variable-length wildcards using recursion with memoization or dynamic programming.

  eBaySoftware EngineerCoding & AlgorithmsTechnical Screen