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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 361–390 of 781 results
- InstacartMediumBackend EngineerDesign Idempotent Due-Date and Hold Notifications
Design idempotent library notifications for upcoming and current due dates plus FIFO hold availability. Use stable business-event identities, transactional scheduling, atomic recipient claims, state rechecks, retries, reconciliation, and clear frontend distinctions among holds, offers, and checkouts.
System DesignOnline Assessment - InstacartMediumSoftware EngineerDesign Idempotent In-App Availability and Due-Date Notifications
Design asynchronous in-app availability alerts and due-date reminders with Celery, Redis, durable idempotency, versioned schedules, and crash recovery.
System DesignOnline Assessment - InstacartHardSoftware EngineerDesign cloud storage with quotas and compression
This question evaluates a candidate's ability to design a multi-tenant cloud storage system, testing competencies in API design, quota accounting, compression strategies, distributed storage architecture (partitioning, replication/erasure coding), consistency models, security, versioning, and observability.
System DesignOnline Assessment - InstacartMediumBackend EngineerFix the Broken Search Filter in a Book Catalog API
This problem tests your ability to sanitize inputs and implement robust filtering logic on a collection of structured objects using multiple criteria.
Coding & AlgorithmsOnline AssessmentFilteringStringsBackend - InstacartMediumSoftware EngineerImplement an In-Memory File Storage System
This question evaluates the ability to design and implement efficient in-memory data structures and algorithms for stateful file management, covering string-keyed storage, size accounting, querying and sorting, and user quota enforcement.
Coding & AlgorithmsOnline Assessment - InstacartMediumSoftware EngineerImplement prefix and suffix file search
This question evaluates the ability to design and implement efficient string-indexing data structures and APIs for prefix-and-suffix matching, demonstrating competency with tries, suffix-related structures, inverted indexes, and time/space complexity trade-offs.
Coding & AlgorithmsOnline Assessment - InstacartMediumSoftware EngineerImplement timestamped task management system APIs
This question evaluates a candidate's ability to design and implement time-ordered in-memory data structures and APIs, testing competencies in temporal event ordering and precedence, scheduled deletions, priority-sorted retrieval, user-task assignment, and historical (time-travel) queries.
Coding & AlgorithmsOnline Assessment - InstacartHardSoftware EngineerImplement worker time and payroll tracker
This problem tests your ability to manage overlapping time intervals, perform efficient lookups on historical state changes, and calculate cumulative payroll based on dynamic shift rates.
Coding & AlgorithmsOnline AssessmentIntervalsBinary SearchData Structures - InstacartHardSoftware EngineerLibrary Catalog and Lending System: Five-Phase Engineering Assessment
This problem tests the ability to design an extensible lending system, implement a search algorithm with concurrency constraints, and debug race conditions in a multi-threaded environment.
Software Engineering FundamentalsOnline Assessmentconcurrencydata-structuressystem-design - Interactive BrokersMediumSoftware EngineerCalculate Tax Under Progressive Income Brackets
This problem tests the ability to iterate through sorted intervals and calculate values based on overlapping ranges, requiring careful boundary handling.
Coding & AlgorithmsOnline AssessmentArraysSimulationGreedy - Interactive BrokersEasySoftware EngineerCalculate Tax in a Progressive Marginal Tax System
Practice a Interactive Brokers coding interview problem focused on calculate tax in a progressive marginal tax system. The prompt emphasizes edge cases, clean implementation, and verifiable test behavior without revealing the solution.
Coding & AlgorithmsOnline Assessment - IntuitMediumSoftware EngineerAggregate transactions by status and failure reasons (SQL)
This question evaluates a candidate's proficiency with SQL aggregation, grouping, window functions, string aggregation, and normalization techniques for summarizing transactional records by status and failure reasons.
Software Engineering FundamentalsOnline Assessment - IntuitMediumSoftware EngineerFind largest file in a directory using Bash
This problem tests your ability to navigate the file system using command-line utilities and process streaming data to identify files based on size metadata.
Software Engineering FundamentalsOnline AssessmentBashLinuxScripting - IntuitMediumSoftware EngineerFind largest filename from ls -l output
This question evaluates proficiency in text parsing, tokenization, and numeric comparison applied to command-line style output, emphasizing robust handling of varied input formats and edge cases.
Coding & AlgorithmsOnline Assessment - IntuitMediumSoftware EngineerProduce valid student lineup from parent array
This problem tests your ability to reconstruct a valid topological ordering (parent-before-child) from a parent-child relationship array while maintaining lexicographical minimality.
Coding & AlgorithmsOnline AssessmentGraphsTreesPriority Queue - IntuitMediumSoftware EngineerSum palindrome-change costs over all substrings
This question evaluates understanding of string algorithms, combinatorial counting, and algorithmic optimization for aggregating pairwise mismatch costs across all substrings.
Coding & AlgorithmsOnline Assessment - J.P. MorganMediumSoftware EngineerGroup anagrams and count string in grid
This question evaluates algorithmic problem-solving skills in string processing, hashing/grouping and grid traversal/backtracking, along with the ability to analyze time and space complexity and trade-offs.
Coding & AlgorithmsOnline Assessment - J.P. MorganEasySoftware EngineerImprove shopping cart latency and stock notifications
This question evaluates a candidate's ability to design scalable, low-latency e-commerce architectures and real-time notification mechanisms while reasoning about data consistency, concurrency control, and correctness under high traffic (including concerns like avoiding oversells).
System DesignOnline Assessment - J.P. MorganMediumSoftware EngineerMinimize Operations to Balance Shipments
This question evaluates algorithmic optimization and array partitioning skills, focusing on modeling minimal integer adjustments to equalize partition sums and demonstrating numerical reasoning under constraints.
Coding & AlgorithmsOnline Assessment - J.P. MorganMediumSoftware EngineerSplit Modules Across Three Servers to Maximize the Minimum Deployment Difficulty
Assign modules with given difficulty values to three non-empty servers so that the smallest value of |d1 - d2| + |d2 - d3|, over one module picked from each server, is as large as possible. Tests max-min reasoning over partitions, the role of the middle server, and handling of duplicates and large values.
Coding & AlgorithmsOnline Assessment - Jane StreetMediumQuantitative TraderAnalyze trading RFQ competitiveness data
This question tests your ability to model order flow competitiveness by deriving features from trade logs and assessing the relationship between pricing aggressiveness and win probability.
Machine LearningOnline AssessmentLogistic RegressionFeature EngineeringMarket Microstructure - Jane StreetMediumSoftware EngineerImplement Connect Four with bottom push-up
This question evaluates proficiency in data structures, algorithm design, state management, and API design for game mechanics, focusing on board representation, move operations, win detection, and undo/redo functionality.
Coding & AlgorithmsOnline Assessment - Jane StreetMediumQuantitative TraderSolve queue switch and coin change puzzles
This two-part question evaluates probabilistic reasoning about expected waiting times with random queue switching and combinatorial/algorithmic counting for coin-change combinations, testing skills in probability, expectation and order statistics as well as combinatorics and dynamic programming within the Coding & Algorithms domain.
Coding & AlgorithmsOnline Assessment - Jump TradingEasySoftware EngineerExpand a Serial and Parallel Task Composition Specification
Tests parsing structured workflow specifications with nested delimiters and quoted literals, then generating all concrete serial execution paths via Cartesian expansion.
Coding & AlgorithmsOnline AssessmentString ParsingRecursionBacktracking - Jump TradingEasySoftware EngineerIdentify Files That Need Synchronization
Determine which files from a source system need to be synchronized to a destination system based on permissions, presence, size, and modification timestamps.
Coding & AlgorithmsOnline Assessmenthash-tablestringimplementation - Jump TradingMediumSoftware EngineerIdentify read-only files from permission records
This problem tests your ability to parse Unix-style permission strings and implement filtering logic based on bitmask-like constraints.
Coding & AlgorithmsOnline AssessmentString ParsingFilteringAlgorithms - Jump TradingMediumMachine Learning EngineerSolve stock trading with pattern rules
This set of problems evaluates algorithmic skills in pattern recognition, state management, and sequence processing, specifically testing pattern-based decision rules on time-series stock data and iterative substring elimination in string processing within the Coding & Algorithms domain.
Coding & AlgorithmsOnline Assessment - Jump TradingMediumMachine Learning EngineerSolve stock-pattern trading and substring elimination
This question evaluates algorithmic skills in array pattern recognition and string processing, specifically detecting day-to-day sign patterns for simulated trading and repeated elimination of fixed two-character substrings; it belongs to the Coding & Algorithms domain for a Machine Learning Engineer position and targets practical application of linear-time, constant-extra-space techniques. It is commonly asked to evaluate efficient O(n) algorithm design, handling of stateful streaming simulations and in-place string reduction under tight time/space constraints, and correctness reasoning for edge cases.
Coding & AlgorithmsOnline Assessment - KneronMediumSoftware EngineerCompute sum of minima with removals
Compute sum of minima with removals evaluates algorithm design, data structures, correctness, complexity, edge cases, and implementation details in a realistic interview setting. A strong answer states assumptions, handles edge cases, explains trade-offs, and shows how to validate the result clearly.
Coding & AlgorithmsOnline Assessment - KneronMediumSoftware EngineerCount IoT devices matching date and threshold
This question evaluates handling of paginated REST APIs, JSON parsing and nested-data filtering, month/year date parsing, and numeric threshold comparisons, reflecting skills in data retrieval and programmatic data manipulation.
Data Manipulation (SQL/Python)Online Assessment
Instacart
Intuit
J.P. Morgan
Jane Street