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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.
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Showing 4441–4470 of 9403 results
- LeagueMediumSoftware EngineerDesign scalable insurance claims processing system
Walks through designing a scalable insurance claims processing system: ingestion, validation, routing, and the reliability and consistency trade-offs. Includes a worked system design solution.
System DesignTechnical Screen - LegoraMediumSoftware EngineerDeep-Dive into a Technical Project
Tests an engineer's ability to articulate, defend, and reflect on a complex technical project, demonstrating clear ownership, architectural decision-making, and self-awareness about trade-offs and failures.
Behavioral & LeadershipOnsiteSystem ArchitectureTechnical LeadershipTrade-offs - LegoraMediumSoftware EngineerDesign Direct File Uploads for a Chat Application
Design a scalable direct-to-object-store file upload pipeline for a chat platform, focusing on presigned authorization, durable lifecycle tracking, asynchronous validation, and orphan reconciliation.
System DesignOnsiteObject StorageFile UploadDistributed Systems - LegoraMediumBackend EngineerDesign a Cloud-Agnostic Upload Adapter
Design a provider-neutral object storage upload client that unifies cloud SDK behaviors while supporting streaming, multipart uploads, error normalization, and provider-specific escape hatches.
Software Engineering FundamentalsOnsiteapi-designcloud-storageobject-oriented-design - LegoraMediumSoftware EngineerDesign a Cloud-Provider Upload Adapter
Design a modular, provider-agnostic upload adapter interface that enables clients to perform direct uploads to cloud storage (e.g., S3, GCS, Azure Blob). The problem evaluates object-oriented API design, error normalization, capability negotiation, and idempotent verification workflows.
Software Engineering FundamentalsOnsiteapi-designobject-oriented-designcloud-storage - LegoraHardSite Reliability EngineerDesign a Compliance Audit Log Platform
Design an immutable, multi-tenant compliance audit logging platform that supports canonical ingestion, cryptographic tamper evidence, gap detection, and efficient legal investigation queries at scale.
System DesignOnsiteDistributed SystemsSRESecurity - LegoraMediumSoftware EngineerPresent a Technically Challenging Project
Tests a candidate's ability to communicate complex technical work, defend architectural decisions under scrutiny, and demonstrate end-to-end ownership from problem formulation to production operations.
Behavioral & LeadershipOnsiteBehavioralSystem DesignTechnical Communication - LegoraMediumSoftware EngineerSenior engineer project deep dive: trade-offs, scale, challenges, hardest part
Behavioral question for senior software engineers: lead a 20-minute deep dive into a past project and answer probing questions about trade-offs, operating scale, challenges and the hardest part. It assesses ownership, engineering judgment, use of concrete numbers, and clear technical communication under time pressure.
Behavioral & LeadershipTechnical Screen - LendingClubMediumData ScientistDetermine If Two Numbers Sum to Target
This question evaluates a candidate's basic algorithmic fluency in array processing and the ability to reason about pairwise sums using auxiliary data structures.
Coding & AlgorithmsTechnical Screen - LendingClubMediumData ScientistQuery Active Loans by Borrower ID in SQL
This question evaluates proficiency with SQL data aggregation, grouping, and ordering to compute borrower-level loan totals, assessing practical skills in relational data manipulation within the Data Manipulation (SQL/Python) domain.
Data Manipulation (SQL/Python)Technical Screen - LiftoffMediumSoftware EngineerCompute the Eddington number from ride distances
This question evaluates a candidate's competence in array manipulation, ordering/selection techniques, counting thresholds, and algorithmic complexity analysis required to compute the Eddington number.
Coding & AlgorithmsOnsite - LiftoffMediumSoftware EngineerDesign and implement core Tetris game logic
This question evaluates practical implementation skills in game logic, real-time state and event management, piece rotation and movement handling, line-clearing algorithms, and clean, testable code organization.
Software Engineering FundamentalsOnsite - LiftoffMediumSoftware EngineerFind degrees of connection in a LinkedIn graph
This question evaluates understanding of graph traversal, reachability and shortest-path concepts along with the ability to manage performance constraints on large sparse graphs.
Coding & AlgorithmsOnsite - LiftoffMediumSoftware EngineerImplement minimal RLE encode/decode with max run K
This question evaluates proficiency in string parsing and compression techniques, specifically run-length encoding/decoding, pattern detection, and algorithmic optimization for producing minimal-length encodings under a maximum pattern length constraint.
Coding & AlgorithmsTechnical Screen - LiftoffMediumSoftware EngineerParse and expand an IPv6 address
This question evaluates proficiency in IPv6 address parsing, string validation, and canonicalization, testing understanding of hexadecimal hextets and the zero-compression (::) rule within the Coding & Algorithms domain.
Coding & AlgorithmsOnsite - LiftoffHardMachine Learning EngineerProbability That the Sum of 1,000 Fair Die Rolls Exceeds a Threshold
A fair six-sided die is rolled 1,000 times; estimate the probability that the sum of the faces exceeds a threshold, including a threshold of 600. Tests the mean and variance of one roll, how they scale for a sum of independent rolls, the normal approximation with a continuity correction, and range checks.
Statistics & MathOnsite - LilaMediumMachine Learning EngineerDebug a Transformer bug in an unfamiliar repo
This question tests your ability to identify and rectify a logical error in a Transformer's multi-head self-attention mechanism, specifically focusing on tensor dimensionality, causality masking, and numerical stability.
Software Engineering FundamentalsOnsiteTransformersDeep LearningDebugging - LilaMediumMachine Learning EngineerDesign a DNA-sequence optimization loop
This problem tests your ability to design a closed-loop active learning system for protein or DNA sequence engineering, focusing on the iterative cycle of sequence generation, uncertainty estimation, and experimental validation.
ML System DesignOnsiteActive LearningGenerative ModelsBioinformatics - LimeEasySoftware EngineerCombine Overlapping Closed Intervals Into a Sorted Disjoint List
Given an unordered list of closed integer intervals, possibly with duplicates, nested intervals and touching endpoints, combine every chain of overlapping intervals and return the disjoint result ordered by start. It tests interval reasoning, precise overlap rules at shared endpoints, and careful handling of edge cases.
Coding & AlgorithmsTechnical Screen - LinkedInHardData ScientistAnalyze homepage drop and feed ranking
This question evaluates a candidate's competency in product analytics, causal diagnosis, instrumentation and logging validation, segmentation and cohort analysis, and experimental design for feed ranking and user-path behavior.
Analytics & ExperimentationTechnical Screen - LinkedInEasyData ScientistAnalyze member video posting behavior by country
A LinkedIn data scientist technical-screen question on member video-posting behavior using two relational tables. It tests joins, first-event derivation with MIN/GROUP BY, conditional grouping for US vs non-US comparison, and distinct-member counts per country with a length filter.
Data Manipulation (SQL/Python)Technical Screen - LinkedInEasySoftware EngineerAnswer Repeated Shortest Word Distance Queries
Design a data structure that preprocesses a list of words to efficiently answer repeated queries for the shortest index distance between two distinct words.
Coding & AlgorithmsTechnical Screenhash-tabletwo-pointersdesign - LinkedInMediumMachine Learning EngineerAnswer practical ML foundations questions
This question evaluates an interviewee's practical mastery of ML foundations, covering probability calibration and its evaluation, feature selection methods including neural-network approaches, tokenizer types and trade-offs in NLP, and optimizer behavior such as Adam's maintained statistics.
Machine LearningOnsite - LinkedInEasySoftware EngineerArrange Nonnegative Integers to Form the Largest Number
Tests custom sorting logic and string manipulation to arrange a list of nonnegative integers into the lexicographically largest combined numerical string.
Coding & AlgorithmsTechnical Screensortinggreedystring - LinkedInMediumSoftware EngineerBlock Malicious IPs at an API Gateway Across Data Centers
Design gateway IP-block enforcement with trusted client addresses, versioned rules, fast local checks, expiration, and multi-data-center propagation.
System DesignOnsite - LinkedInMediumSoftware EngineerCan You Place N Objects?
This problem tests your ability to handle greedy array traversal while maintaining specific adjacency constraints, requiring careful management of boundary indices.
Coding & AlgorithmsTechnical ScreenArraysGreedySimulation - LinkedInMediumSoftware EngineerCheck Whether a String Is a Signed Decimal Number Without Exponent Notation
Write a function that decides whether a string is a valid plain decimal number with an optional sign and fractional part, rejecting exponents, stray symbols, and repeated decimal points. It tests turning a small grammar into careful character-by-character validation and covering edge cases such as empty strings and bare signs.
Coding & AlgorithmsTechnical Screen - LinkedInEasyData ScientistChoose better bank queue and describe distributions
This question tests your ability to apply basic queueing theory to compare waiting times and your ability to reason about how distributional shape affects central tendency measures.
Statistics & MathTechnical ScreenQueueing TheoryProbabilityStatistics - LinkedInMediumSoftware EngineerCollect and Query Recent User Activity
Design a scalable user activity ingestion and querying system capable of computing metrics over rolling time windows (1 minute, 1 hour, 24 hours) with deduplication and late-arriving event handling.
System DesignOnsitesystem-designdistributed-systemsstream-processing - LinkedInMediumSoftware EngineerCompare heap and stack memory
This question evaluates understanding of memory management concepts including stack versus heap allocation, object lifetimes, allocation and free behavior, access patterns, performance characteristics, and thread visibility within the Coding & Algorithms domain.
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