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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.
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Showing 4411–4440 of 5874 results
- PinterestMediumSoftware EngineerMark and Compact a Heap-Indexed Subtree
This problem tests array manipulation, heap-based tree traversal, and stable partitioning techniques while requiring memory efficiency without modifying the original input.
Coding & AlgorithmsOnline AssessmentArraysTreesHeap - PinterestMediumSoftware EngineerMinimum Transfers Between Pin Boards
Tests breadth-first search and graph modeling skills by finding the shortest path across overlapping collections without constructing a dense graph between every pair.
Coding & AlgorithmsOnsiteBFSGraphHash Map - PinterestMediumSoftware EngineerReason About Nested JSON Schema Validation
Design and implement a recursive JSON schema validator that checks nested objects and arrays, enforces required properties, and returns precise failure paths for validation errors.
Software Engineering FundamentalsOnsiteJSON SchemaRecursionTree Traversal - 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 an Itinerary from Flight Tickets
Tests graph modeling, depth-first search (DFS), and Hierholzer's algorithm to construct an Eulerian path with lexicographical tie-breaking.
Coding & AlgorithmsOnsiteGraphDFSEulerian 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 EngineerReconstruct route from unordered travel tickets
This problem tests your ability to model a graph where each edge represents a transition, requiring you to find a valid linear sequence that visits every node exactly once.
Coding & AlgorithmsOnsiteGraphsHash MapLinked List - 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 EngineerSettle debts with minimal transactions
Pinterest software-engineer onsite coding question: given a list of debts as (debtor, creditor, amount) triples, return settlement transfers that clear every net balance using the minimum number of transactions. It tests reducing to net balances, recognizing the problem is NP-hard, backtracking with pruning to find the optimum for small N, and a heap-based greedy heuristic plus correctness and time/space complexity analysis for large, skewed debt graphs.
Coding & AlgorithmsOnsite - PinterestMediumSoftware EngineerSolve Four Interview Coding Problems
This set tests proficiency in graph algorithms, binary search on sorted data, grid simulations, and custom data structure design for real-time leaderboards.
Coding & AlgorithmsOnsiteGraphsBinary SearchSimulation - 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 - PinterestMediumSoftware EngineerSolve set equality and ad log top‑K
This multi-part question evaluates set and multiset operations, frequency counting, top-K computation over time windows, sliding-window and streaming data structures, and character-multiset matching for string construction within the coding & algorithms domain.
Coding & AlgorithmsOnsite - PinterestMediumSoftware EngineerTrack a User's Top Trending Viewed Pin Within a Sliding Time Window
A data structure design exercise: track the Pins a user has viewed within a sliding time window and, at any moment, return the one with the highest trending score. It asks for methods to add a viewed Pin, remove expired Pins and query the top Pin, plus the runtime complexity of each operation.
Software Engineering FundamentalsOnsite - PitchbookEasySoftware EngineerImplement Euclidean distance and k-nearest neighbors
This question evaluates understanding of Euclidean distance metrics, vector arithmetic, and nearest-neighbor retrieval, testing implementation skills for computing distances and selecting the k closest points.
Coding & AlgorithmsOnsite - 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 - PlaidMediumSoftware EngineerCompute discounted prices in a queue
This question evaluates proficiency in array processing, algorithm design, use of auxiliary data structures such as monotonic stacks, and formal complexity and correctness reasoning.
Coding & AlgorithmsTechnical Screen - PlaidMediumSoftware EngineerCount Completed Jobs in a Serial Multi-Worker Pipeline
Calculate the total number of jobs completed by a given deadline across a multi-stage pipelined system with worker pools. The solution requires simulating stage-by-stage batch execution, tracking wave durations, and enforcing barrier synchronization between stages.
Coding & AlgorithmsTechnical ScreenSimulationDynamic ProgrammingQueue - PlaidMediumSoftware EngineerCount Completed Jobs in a Serial Single-Worker Pipeline
Determine the total number of jobs completed by a single worker executing a sequence of stage-gated tasks before a time limit expires. Tests linear simulation, division/modulo arithmetic, handling of zero-duration and zero-count edge cases, and 64-bit integer safety.
Coding & AlgorithmsTechnical ScreenSimulationMathGreedy - PlaidEasySoftware EngineerDesign a ChatGPT-like conversational assistant
This question evaluates a candidate's ability to design large-scale conversational AI systems, covering competencies in distributed system architecture, real-time streaming, stateful multi-turn session management, safety controls, and integration with external tools.
System DesignTechnical Screen - PlaidMediumSoftware EngineerDesign a coupon redemption system
This question evaluates proficiency in data structures and algorithms for building an in-memory service, including efficient lookup/update strategies, expiration handling, limit enforcement, idempotency, concurrency considerations, and time/space complexity reasoning.
Coding & AlgorithmsTechnical Screen - PlaidEasySoftware EngineerDesign a geo-distributed rate limiter
This question evaluates a candidate's competency in designing geo-distributed, globally consistent rate limiting systems that enforce per-API-key and additional constraints while balancing low-latency request paths and regional failure tolerance.
System DesignTechnical Screen - PlaidMediumSoftware EngineerDesign an Embeddable Pay by Bank Widget
Design a secure, embeddable Pay by Bank frontend widget and supporting backend infrastructure that enables direct bank checkout via an isolated iframe and asynchronous payment processing.
System DesignOnsiteSecurityWeb ArchitecturePayments - PlaidMediumSoftware EngineerExplain What You Seek and an Unexpected Project Outcome
Tests candidate self-awareness, career motivation, and adaptability when technical initiatives diverge from expectations due to real-world constraints.
Behavioral & LeadershipOnsiteBehavioralCareer GoalsAdaptability
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