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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 781–810 of 4616 results
- BloombergMediumSoftware EngineerDesign a packet reassembler API
This question evaluates API design, stream-oriented buffer management, stateful packet assembly, input validation, concurrency control, testing strategy, and time/space complexity reasoning.
System DesignTechnical Screen - BloombergMediumSoftware EngineerDesign an in-memory TODO list API
This problem tests your ability to design a thread-safe, in-memory API for managing tasks, focusing on selecting efficient data structures for retrieval and update operations.
Software Engineering FundamentalsTechnical ScreenAPI DesignConcurrencyHash Maps - BloombergMediumSoftware EngineerDesign variable-size LRU cache
This question evaluates understanding of cache design and eviction policies (LRU), management of variable-sized entries and memory budgeting, and the implementation of efficient data structures that support amortized O(1) access, updates and correct capacity accounting.
Coding & AlgorithmsTechnical Screen - BloombergHardSoftware EngineerDetect Recent Duplicate Records with Bounded Memory
Design a memory-bounded streaming duplicate detector that identifies repeated news/document records within a sliding time window and evicts expired content to prevent memory leaks.
Coding & AlgorithmsTechnical ScreenSliding WindowHash TableQueue - BloombergMediumSoftware EngineerDetermine Balloon Popping Time
This problem tests your ability to model a grid-based propagation process as a shortest-path problem on a weighted graph, requiring an understanding of Dijkstra's algorithm or Breadth-First Search variants.
Coding & AlgorithmsTechnical ScreenGraphBFSShortest Path - BloombergHardSoftware EngineerExplain Kafka partitions and delivery semantics
This question evaluates understanding of distributed messaging and stream-processing concepts—specifically Kafka internals such as partitions, replication, consumer groups, and delivery semantics—and the candidate's competency in reasoning about ordering, scalability, fault tolerance, and transactional guarantees.
System DesignTechnical Screen - BloombergMediumSoftware EngineerFind maximum cable length by cutting
This question evaluates a candidate's proficiency in algorithm design, particularly applying binary search over a monotonic answer space and managing integer versus floating-point precision when maximizing piece length.
Coding & AlgorithmsTechnical Screen - BloombergMediumSoftware EngineerFind the Lowest Common Ancestor of Two Nodes in an N-ary Tree
Given a rooted tree whose nodes can have any number of children, stored as child lists, return the lowest common ancestor of two labeled nodes. The problem generalizes the binary-tree version to arbitrary fan-out and tests tree traversal, ancestor reasoning, and robust handling of very deep, path-shaped trees.
Coding & AlgorithmsTechnical Screen - BloombergMediumSoftware EngineerFlag Fraudulent Transactions by Amount and Travel Time
This problem tests your ability to use hash maps for efficient lookups and filtering collections based on conditional business logic.
Coding & AlgorithmsTechnical ScreenHash MapsAlgorithmsData Structures - BloombergEasySoftware EngineerGenerate the Collatz Sequence From a Positive Integer Down to 1
Write a function that runs the Collatz process from a positive integer, halving even values and replacing odd values with three times the value plus one, and returns every number visited until reaching 1. It tests loop termination, edge cases such as a start of 1, and intermediate values beyond 32-bit range.
Coding & AlgorithmsTechnical Screen - BloombergMediumProduct ManagerHow would you manage platform transitions?
How would you manage platform transitions? evaluates product goals, user impact, metrics, trade-offs, risks, and decision criteria in a realistic interview setting. A strong answer states assumptions, handles edge cases, explains trade-offs, and shows how to validate the result clearly.
Product / Decision MakingTechnical Screen - BloombergMediumData EngineerImplement RotatingFileSink in hierarchy
This question evaluates a candidate's proficiency in Python object-oriented design, file I/O and JSON serialization, concurrency control via locking, context manager protocols, custom exception handling, and adherence to Liskov substitution when implementing a rotating file sink.
Software Engineering FundamentalsTechnical Screen - BloombergMediumSoftware EngineerImplement a simplified grep with extensible flags
This question evaluates competency in designing maintainable, extensible text-processing code, covering flag parsing, separation of concerns, and correct substring matching behavior.
Coding & AlgorithmsTechnical Screen - BloombergMediumSoftware EngineerImplement classes in existing abstract hierarchy
This question evaluates object-oriented design and implementation skills in Python within the Coding & Algorithms and software engineering domain, focusing on completing concrete subclasses in an existing abstract class hierarchy while preserving public interfaces and type compatibility.
Coding & AlgorithmsTechnical Screen - BloombergMediumData EngineerImplement classes within an abstract Python framework
This question evaluates a candidate's skills in object-oriented design, implementing concrete classes from abstract interfaces, file I/O and streaming data transformations, error handling, and integration with a registry and CLI within a Python codebase.
Coding & AlgorithmsTechnical Screen - BloombergMediumSoftware EngineerImplement sliding-window timestamped average
This question evaluates understanding of time-based sliding-window data structures, streaming aggregation, and the handling of timestamped records with efficient incremental updates and evictions.
Coding & AlgorithmsTechnical Screen - BloombergMediumSoftware EngineerImplement streaming enrichment aggregator
This problem tests your ability to design a stateful stream processor that aggregates fragmented event data based on a shared correlation ID within a sliding time window.
Coding & AlgorithmsTechnical ScreenHashMapsStream ProcessingConcurrency - BloombergMediumSoftware EngineerIntroduce yourself and explain why Bloomberg
This question evaluates a candidate's communication, project ownership, technical decision-making, and motivation for joining the prospective employer, with emphasis on articulating specific contributions, trade-offs, and measurable impact.
Behavioral & LeadershipTechnical Screen - BloombergMediumSoftware EngineerMinimize Travel Assignment Cost
This problem tests your ability to minimize costs when assigning workers to multiple destinations, requiring an application of dynamic programming to manage fixed capacity constraints.
Coding & AlgorithmsTechnical ScreenDynamic ProgrammingBitmaskingOptimization - BloombergMediumSoftware EngineerMinimum Character Replacements to Make One String an Anagram of Another
Given two strings of equal length made of lowercase letters, find the fewest single-character replacements in the second string that turn it into an anagram of the first. This phone-screen coding problem tests character frequency counting and precise reasoning about which letters must change.
Coding & AlgorithmsTechnical Screen - BloombergMediumSoftware EngineerSolve Magic Dictionary and unknown traversal
This interview question evaluates algorithm design, data structures, correctness, complexity, edge cases, and implementation details in a realistic interview setting. A strong answer for Solve Magic Dictionary and unknown traversal states assumptions, handles edge cases, explains trade-offs, and shows how to validate the result clearly.
Coding & AlgorithmsTechnical Screen - BloombergMediumSoftware EngineerSolve common string/tree/grid interview tasks
This problem tests your ability to perform a vertical-order traversal of a binary tree by mapping nodes to relative column indices and sorting them by their depth and value.
Coding & AlgorithmsTechnical ScreenTreesBFSSorting - BloombergEasySoftware EngineerSolve meeting and tree problems
This problem tests your ability to manipulate overlapping intervals and perform specific tree traversals to extract structural information.
Coding & AlgorithmsTechnical ScreenSortingIntervalsBinary Tree - BloombergMediumSoftware EngineerSolve sliding-window, flattening, decode, and O(1) random set
This problem tests your ability to handle nested data structures through recursive parsing, maintain efficient state using hash maps and dynamic arrays, and implement sliding window techniques to manage constraints in a stream.
Coding & AlgorithmsTechnical ScreenStackRecursionHash Map - BloombergMediumSoftware EngineerSolve string dictionary and tree ordering
This question evaluates design and analysis skills for string-matching data structures that support one-edit queries and for binary tree traversal with coordinate-based ordering, testing understanding of data structures, search algorithms, sorting, and complexity analysis within the Coding & Algorithms domain.
Coding & AlgorithmsTechnical Screen - BloombergMediumSoftware EngineerValidate whether brackets are properly nested
This problem tests your ability to use a stack data structure to maintain LIFO ordering for matching paired symbols within a string.
Coding & AlgorithmsTechnical ScreenStackStringData Structures - BloombergMediumData EngineerWrite PostgreSQL string-manipulation query
This question evaluates proficiency in PostgreSQL string manipulation, regular expressions, URL parsing, key-value parsing and timestamp-based filtering for data transformation tasks.
Data Manipulation (SQL/Python)Technical Screen - BnpEasyData ScientistExplain and compute option delta
Evaluates understanding of option delta, the differing intuitions/signs for calls versus puts, and the ability to compute deltas under the Black–Scholes model; commonly asked to assess quantitative reasoning about derivative sensitivities, model-based pricing, and hedging concepts.
Software Engineering FundamentalsTechnical Screen - BnpEasyData ScientistFind expected tosses to see a coin pattern
Assesses probabilistic reasoning and stochastic-process modeling skills, focusing on expected stopping times for pattern occurrences in repeated independent trials and related concepts like state-space representation and overlap effects.
Software Engineering FundamentalsTechnical Screen - BnpEasyData ScientistHow do you split coins to match heads?
This question evaluates logical reasoning about invariants and combinatorial parity, testing the candidate's ability to design deterministic strategies under partial information; it falls under Software Engineering Fundamentals with relevance to probability and discrete mathematics for a Data Scientist role.
Software Engineering FundamentalsTechnical Screen
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