practice a little every day, paws crossed ♡
Software Engineer 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 2011–2040 of 2810 results
- PinduoduoMediumSoftware EngineerLongest Single-Letter Substring After at Most k Character Changes
Given a string of uppercase letters and a budget of at most k single-character changes, find the longest run of one repeated letter that can be produced. Tests reasoning about which substrings can be made uniform, efficient counting, and a near-linear solution for strings of up to 100,000 characters.
Coding & AlgorithmsTechnical Screen - PinduoduoMediumSoftware EngineerNavigate a Senior Engineering HR Interview
Build a consistent narrative for a senior engineering HR interview covering current scope, motivation, role interest, parallel processes, and compensation. Ground seniority in evidence, protect confidential information, and compare opportunities using total compensation and role fit.
Behavioral & LeadershipTechnical Screen - PinduoduoHardSoftware EngineerPresent Evidence for Professional Strengths and Weaknesses
This question assesses the candidate's self-awareness, ability to reflect on professional growth, and capacity to articulate impact through specific, evidence-based storytelling.
Behavioral & LeadershipTechnical ScreenBehavioralSelf-ReflectionSoft Skills - PinduoduoMediumSoftware EngineerTrace Java Static and Instance Field Initialization
This question tests the understanding of Java class loading, static initialization blocks, and the order of operations between class-level and instance-level fields.
Software Engineering FundamentalsTechnical ScreenJavaJVMStatic-Initialization - PinduoduoMediumSoftware EngineerTraverse a Matrix in Spiral Order
Traverse a rectangular matrix in clockwise spiral order using shrinking boundaries. Handle empty, single-row, and single-column inputs without duplicates while achieving linear time and constant auxiliary space beyond the result.
Coding & AlgorithmsTechnical Screen - PinterestMediumSoftware EngineerAnswer Policy Violation Log Queries
Design an in-memory query engine over a timestamp-sorted policy violation log to support aggregate, point, and range queries efficiently using hash maps and binary search.
Coding & AlgorithmsTechnical Screenhash-tablebinary-searchdesign - PinterestMediumSoftware EngineerAssign Pins to Shortest Columns
This question evaluates understanding of greedy assignment strategies and data structures for maintaining and updating minimums in an online allocation problem, while also testing load-balancing reasoning and analysis of time and space complexity.
Coding & AlgorithmsTechnical Screen - PinterestMediumSoftware EngineerDecide target via subsequence plus/multiply expression
A Pinterest software-engineer coding screen: given positive 32-bit integers and a target, decide whether some subsequence with '+'/'*' operators evaluated strictly left to right (equal precedence) hits the target, and return a valid expression. The answer spans forward backtracking, monotonicity-based pruning, a divisibility-guided reverse search from the target, complexity analysis, and 32-bit overflow handling.
Coding & AlgorithmsTechnical Screen - PinterestMediumSoftware EngineerDelete and Compact a Forest Stored by Parent Indices
Implement subtree deletion on a parent-pointer forest array, supporting tombstoning and index compaction with pointer remapping.
Coding & AlgorithmsTechnical Screentreegrapharray - PinterestMediumSoftware EngineerDesign Blackjack Hands, Splits, and a Multi-Deck Shoe
This problem tests object-oriented design principles, specifically the ability to model a card game with multiple decks, complex state transitions (like splitting), and encapsulation of game rules.
Software Engineering FundamentalsTechnical ScreenObject-Oriented DesignSystem ModelingGame Logic - PinterestMediumSoftware EngineerDesign a Distributed Rate Limiter
This problem evaluates your ability to design a distributed rate-limiting service that maintains low latency while enforcing consistent request quotas across multiple global nodes.
System DesignTechnical ScreenDistributed SystemsCachingConcurrency - PinterestMediumSoftware EngineerDesign a violation log analyzer
This question evaluates proficiency in data structures, in-memory indexing and query design, algorithmic time/space complexity analysis, and reasoning about state management for dynamic event streams.
Coding & AlgorithmsTechnical Screen - PinterestMediumSoftware EngineerDetermine equality of arbitrarily nested sets
This question evaluates understanding of nested data structures and set semantics, including canonicalization, hashing, recursion, handling of edge cases, unit-test design, and time/space complexity analysis.
Coding & AlgorithmsTechnical Screen - PinterestMediumSoftware EngineerFind First Prefix-Matching Word
This problem tests your ability to efficiently search through a collection of strings to find the first element that satisfies a specific prefix condition, emphasizing clean iteration and edge case management.
Coding & AlgorithmsTechnical ScreenStringsArraysIteration - PinterestMediumSoftware EngineerGenerate Attribute Combinations
Explain Cartesian-product generation for attribute choices while preserving mixed value types and making ordering, duplicates, and empty cases explicit.
Software Engineering FundamentalsTechnical Screen - PinterestMediumSoftware EngineerImplement Hierarchical Region Access Overrides
Design and implement a regional access control system that handles time-based access overrides on a static tree hierarchy with out-of-order updates.
Software Engineering FundamentalsTechnical ScreenTreeBinary SearchData Structures - PinterestMediumSoftware EngineerImplement a min-heap column allocator
This question evaluates a candidate's competency in data structures (priority queues/min-heaps), online algorithm design for stream processing, and complexity and memory analysis.
Coding & AlgorithmsTechnical Screen - PinterestMediumSoftware EngineerList Unallocated Experiment Buckets
Determine all unassigned experiment bucket IDs in the range [0, total_buckets - 1] given lists of control and treatment bucket allocations.
Coding & AlgorithmsTechnical Screenarrayhash-tablebit-manipulation - PinterestMediumSoftware EngineerRebalance Experiment Buckets with Minimal Reassignment
Implement a deterministic rebalancing algorithm that redistributes entities among experiment buckets to meet exact target counts while minimizing reassignments and applying canonical tie-breaking.
Coding & AlgorithmsTechnical Screengreedysortinghash-map - PinterestMediumSoftware EngineerReconstruct an Itinerary While Keeping an Unspecified Variant Explicit
Tests finding an Eulerian path in a directed multigraph with lexicographical tie-breaking using Hierholzer's algorithm.
Software Engineering FundamentalsTechnical Screengraphdfseulerian-path - PinterestMediumSoftware EngineerReconstruct itinerary with lexicographic ties
This question evaluates a candidate's ability to model and traverse directed graphs with repeated edges, enforce lexicographic ordering among possible paths, and analyze time and space complexity for an algorithmic solution.
Coding & AlgorithmsTechnical Screen - PinterestMediumSoftware EngineerRemove and Compact a Parent-Index Forest
Tests tree traversal to find subtrees, array compaction, and index remapping on a parent-pointer forest representation without mutating input data.
Coding & AlgorithmsTechnical Screentreearraybfs - PinterestMediumSoftware EngineerRound numeric string values
This question evaluates parsing and numeric manipulation skills, specifically implementing rounding rules for numeric strings and handling decimals, significant digits, and precision edge cases.
Coding & AlgorithmsTechnical Screen - PinterestHardSoftware EngineerScheduling Four Apps at Once on Kubernetes and a Node-Feedback Scheduler Plugin
A Kubernetes scheduling exercise for a senior infrastructure role: four applications request scheduling at the same time, and the candidate must ask the questions that settle capacity, priority, placement and coordination, then commit to a plan. A second part designs a scheduler plugin that uses signals reported by nodes.
System DesignTechnical Screen - PinterestMediumSoftware EngineerSelect the Nearest Eligible Elevator
Implement an elevator dispatch selection algorithm that finds the nearest eligible elevator for a passenger request based on floor, direction, and tie-breaking rules.
Coding & AlgorithmsTechnical Screenarrayssimulationgreedy - PinterestHardSoftware EngineerSenior Staff Infra Hiring Manager Screen: Career Arc, Reasons for Leaving, Team Fit
A hiring manager conversation for a senior staff backend infrastructure role covering a walkthrough of the last ten years of a career, the reasons for leaving a current job, and how past work maps to the team's technical challenges. It tests narrative focus, staff-level scope and honest self-assessment.
Behavioral & LeadershipTechnical Screen - PinterestMediumSoftware EngineerSettle Group Expenses with Transfers
This question evaluates the ability to compute and reconcile per-person financial balances from transactional data and to translate net liabilities into direct transfers, exercising skills in numeric bookkeeping and data aggregation.
Coding & AlgorithmsTechnical Screen - PinterestMediumSoftware EngineerSolve Multiple Coding Interview Problems
Tests breadth-first search and bipartite/dual-graph modeling to find the minimum number of transit lines needed to travel between two stops.
Coding & AlgorithmsTechnical ScreenGraphBFSHash Table - PinterestMediumSoftware EngineerSolve Two Grid Search Problems
This problem tests your ability to navigate 2D grids and apply graph traversal algorithms to identify connected components and calculate propagation distances.
Coding & AlgorithmsTechnical ScreenGraph TheoryBFSDFS - PlaidMediumSoftware EngineerCalculate Ordered Job Makespan Across Parallel Workers
Calculate the total makespan required to process a queue of ordered jobs across a fixed pool of identical parallel workers.
Coding & AlgorithmsTechnical ScreenHeapGreedySimulation
Pinduoduo
Pinterest
Plaid