Frontend Engineer Interview Questions

Showing 1–12 of 12 results

• AmazonMedium·Frontend Engineer
  Format a Forest of Nested Comments

  This problem tests your ability to reconstruct hierarchical relationships from flat input data and format them into a visual tree representation with specific character-based connectors.

  Coding & AlgorithmsOnsiteRecursionTree TraversalString Formatting
• AmazonMedium·Frontend Engineer
  Maximize the number of binary strings chosen under zero and one budgets

  Given a list of binary strings and separate limits on the total number of zeros and ones, find the largest number of strings that can be chosen together without exceeding either limit. Tests optimization under two simultaneous resource limits, moving from brute force to an efficient method, and complexity analysis.

  Coding & AlgorithmsTechnical Screen
• GoogleHard·Frontend Engineer
  Count Islands with Diagonal Connectivity

  Practice counting binary-grid components when diagonal neighbors connect, changing the usual four-direction island definition.

  Coding & AlgorithmsOnsite
• Jane StreetMedium·Frontend Engineer
  Field Layout: getOffset and insert

  This question evaluates a candidate's ability to model and maintain ordered field layouts by computing and updating byte offsets, testing competencies in dynamic sequence data structures, cumulative offset tracking, and efficient update/query operations.

  Coding & AlgorithmsTechnical Screen
• OktaMedium·Frontend Engineer
  Deduplicate an Array in Linear Time

  This question tests the ability to implement a deduplication algorithm that preserves the original relative order of elements while maintaining O(n) time and space complexity.

  Coding & AlgorithmsTechnical ScreenArraysHash TableTime Complexity
• OpenAIMedium·Frontend Engineer
  Build a Streaming Chat Input

  This question evaluates frontend engineering skills including streaming data handling, incremental token-by-token rendering, asynchronous state management, and preserving UI responsiveness during long-running API streams.

  Coding & AlgorithmsTechnical Screen
• RobinhoodMedium·Frontend Engineer
  Build a Weekly Calendar

  This question evaluates frontend UI engineering skills, focusing on interactive interface construction, event handling, and state modeling to maintain a single source of truth for events in a weekly calendar grid, and it belongs to the web frontend development and UI/state-management domain.

  Coding & AlgorithmsOnsite
• SnowflakeMedium·Frontend Engineer
  Implement an event emitter

  This problem tests your understanding of the observer pattern, internal state management using maps, and the ability to handle edge cases in listener lifecycle management.

  Coding & AlgorithmsTechnical ScreenJavaScriptDesign PatternsEvent-Driven
• TTomaEasy·Frontend Engineer
  Approximate Pi from Random Points

  This question evaluates a candidate's understanding of Monte Carlo estimation, basic Euclidean geometry, probability, and numerical reasoning when using random sampling to approximate mathematical constants.

  Coding & AlgorithmsTechnical Screen
• UberMedium·Frontend Engineer
  Simulate a Rank-Based Tournament

  This question tests the ability to implement a single-elimination tournament simulation using queue-based structures and demonstrates competency in designing a relational database schema for tournament record-keeping.

  Coding & AlgorithmsTechnical ScreenArrayQueueSimulation
• VerkadaMedium·Frontend Engineer
  Implement a recency cache and min-coins DP

  This problem tests your ability to combine a Least Recently Used (LRU) cache mechanism with a dynamic programming approach for optimization.

  Coding & AlgorithmsOnsiteHash MapDoubly Linked ListDynamic Programming
• WaymoMedium·Frontend Engineer
  Filter Matching Subtrees from an N-Ary Tree

  This problem tests tree traversal techniques, string matching, and the ability to handle iterative tree processing to avoid stack overflow in deep structures.

  Coding & AlgorithmsOnsiteTreesN-ary TreeAlgorithms