Backend Engineer Interview Questions

Showing 1–11 of 11 results

• Applied IntuitionHard·Backend Engineer
  Resolve Dependent Addition Equations

  Implement an equation evaluator that computes the integer values of variables defined in terms of literals and other variables while detecting cycles and undefined references.

  Coding & AlgorithmsTechnical ScreenGraphTopological SortDFS
• ChimeMedium·Backend Engineer
  Solve classic backend coding problems

  This problem tests your ability to handle string manipulation, recursion with backtracking, and mapping logic by generating all valid word combinations from a numeric keypad sequence.

  Coding & AlgorithmsTechnical ScreenBacktrackingRecursionStrings
• CCourseraHard·Backend Engineer
  Implement Popular and Ranked Voting

  This question evaluates algorithmic implementation skills and understanding of voting systems, including aggregation of first-place preferences and the conceptual mechanics of elimination-based ranked-choice counting.

  Coding & AlgorithmsTechnical Screen
• DatabricksMedium·Backend Engineer
  Find First Anagram Occurrence

  This question evaluates proficiency in string processing, character-frequency analysis, and efficient substring search techniques, measuring competency in algorithmic reasoning and implementation for pattern matching.

  Coding & AlgorithmsTechnical Screen
• OpenAIMedium·Backend Engineer
  Convert IPv4 Ranges to CIDR Blocks

  This question evaluates understanding of IPv4 addressing, binary/bitwise manipulation, and the ability to summarize consecutive address ranges into minimal CIDR blocks, and belongs to the Coding & Algorithms domain for backend engineering roles.

  Coding & AlgorithmsTechnical Screen
• OOpendoorHard·Backend Engineer
  Execute a TTL Key-Value Store with Transactions

  This problem tests the implementation of an in-memory key-value store supporting TTL expiration, atomic transactions with rollback capabilities, and logical time-based validation.

  Coding & AlgorithmsTechnical ScreenHashMapsTransactionsTTL
• OOtherMedium·Backend Engineer
  Compare Strings With Deletions

  This question evaluates string processing and algorithmic optimization skills, specifically handling simulated deletions (backspace behavior) and performing comparisons under a strict auxiliary space constraint.

  Coding & AlgorithmsTechnical Screen
• RRilletMedium·Backend Engineer
  Distribute Annual Revenue Across Twelve Months

  This problem tests logic, integer arithmetic, and edge-case handling by requiring the distribution of a total sum into equal parts while managing remainders without using floating-point numbers.

  Coding & AlgorithmsTechnical ScreenAlgorithmsInteger ArithmeticData Manipulation
• RobinhoodMedium·Backend Engineer
  Count and Rank Words in a Paragraph

  This problem tests string manipulation, hash map usage for frequency counting, and custom sorting logic for deterministic ordering.

  Coding & AlgorithmsTechnical ScreenStringsHash MapSorting
• SpotifyMedium·Backend Engineer
  Longest Contiguous Stretch of Distinct Characters in a String

  A Spotify backend technical-screen coding problem: given a string, find the length of the longest contiguous substring in which no character repeats. It tests careful string scanning, linear-time reasoning, and edge cases such as case sensitivity, ties and empty input.

  Coding & AlgorithmsTechnical Screen
• UberMedium·Backend Engineer
  Replace Dashes With Nearest Letters

  This problem tests your ability to perform a multi-source shortest path search on a grid to determine the influence of characters on empty spaces, using Manhattan distance and lexicographical tie-breaking.

  Coding & AlgorithmsTechnical ScreenBFSGridGraph