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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 6541–6570 of 9403 results
- OracleMediumSoftware EngineerCheck That a String of Three Bracket Types Is Properly Nested
Decide whether a string made of round, square and curly brackets is properly nested, meaning every closing bracket matches the most recently opened bracket of the same type and nothing is left open. Tests careful handling of nesting order, crossing pairs and unmatched brackets at either end.
Coding & AlgorithmsTechnical Screen - OracleMediumSoftware EngineerClassify Tree Nodes in SQL
Tests the ability to write conditional logic and subqueries/joins in SQL to classify hierarchical tree nodes into 'Root', 'Inner', or 'Leaf'.
Data Manipulation (SQL/Python)Technical ScreenSQLPostgreSQLTrees - OracleMediumSoftware EngineerCommunicate a Difficult Decision to Stakeholders
This question assesses the candidate's ability to navigate complex stakeholder management, transparent communication, and conflict resolution when technical trade-offs negatively impact project delivery.
Behavioral & LeadershipOnsiteCommunicationStakeholder ManagementConflict Resolution - OracleMediumSoftware EngineerConnect Technical Work to Business Impact
Tests your ability to bridge low-level engineering implementation with high-level business, operational, or customer outcomes. Evaluates whether you can measure success with rigorous metrics, recognize trade-offs, and acknowledge attribution constraints.
Behavioral & LeadershipOnsiteBehavioralLeadershipBusiness Impact - OracleMediumSoftware EngineerContribute to a Complex Project
This question assesses a candidate's ability to articulate their specific impact within a team setting, focusing on collaboration, ownership, and technical project management.
Behavioral & LeadershipOnsiteLeadershipCollaborationProject Management - OracleMediumData ScientistCount Closed Islands
This problem tests your ability to navigate a 2D grid using graph traversal algorithms like DFS or BFS while identifying connected components that do not touch the grid boundaries.
Coding & AlgorithmsTechnical ScreenDFSBFSGraph - OracleMediumData ScientistCount Interior Islands After Flooding
This question evaluates understanding of grid-based graph traversal and connected-component detection, focusing on flood-fill logic and the treatment of boundary-connected regions in a binary grid.
Coding & AlgorithmsTechnical Screen - OracleMediumSoftware EngineerCount Islands and Return the Largest Island Size
Count four-connected islands and find the largest island using DFS or BFS, with correct visited-state handling and all-water behavior.
Coding & AlgorithmsOnsite - OracleMediumSoftware EngineerCount anagram-based replacements per phrase
This question evaluates skills in string processing, anagram grouping, frequency mapping, and combinatorial counting to determine how many phrase variations arise from permissible replacements in the Coding & Algorithms domain.
Coding & AlgorithmsTechnical Screen - OracleEasyData ScientistCount closed islands in a grid
This problem tests your ability to navigate a 2D grid using graph traversal algorithms like DFS or BFS while handling specific boundary constraints to identify closed regions.
Coding & AlgorithmsTechnical ScreenDFSBFSMatrix - OracleEasySoftware EngineerDecide When to Simplify Scope and When to Prioritize a Bug Fix
This question evaluates your framework for prioritizing engineering work when faced with competing demands: feature scope reduction versus choosing between bug fixes and new feature development.
Product / Decision MakingOnsitePrioritizationProduct ManagementDecision Making - OracleMediumSoftware EngineerDecide Whether a Parenthesis String With Star Wildcards Can Be Balanced
Decide whether a string of parentheses and stars can become a balanced parenthesis string when each star may independently act as an opening parenthesis, a closing parenthesis or an empty string. Tests reasoning over many possible replacements at once and edge cases with unmatched parentheses near either end.
Coding & AlgorithmsTechnical Screen - OracleEasySoftware EngineerDeep-Dive on an Interesting Technical Project
This question assesses the ability to articulate a technical project's scope, architecture, and impact through structured storytelling, focusing on individual contributions and problem-solving skills.
Behavioral & LeadershipOnsiteBehavioralSystem DesignCommunication - OracleMediumSoftware EngineerDeep-dive a project and show ownership
This question evaluates a candidate's ownership and leadership competencies alongside technical depth, cross-team alignment, communication, and the ability to conduct system and design reviews within software engineering.
Behavioral & LeadershipOnsite - OracleMediumSoftware EngineerDeliver Under a Tight Deadline
Evaluates how you handle time-sensitive engineering commitments by ruthlessly prioritizing scope, maintaining technical rigor and data integrity, and driving clear stakeholder alignment under pressure.
Behavioral & LeadershipOnsiteBehavioralLeadershipProject Management - OracleMediumSoftware EngineerDemonstrate Leadership and Ownership
This question assesses a candidate's ability to influence team members, manage ambiguity, and drive accountability for project outcomes in the absence of a formal management title.
Behavioral & LeadershipOnsiteLeadershipOwnershipInfluence - OracleMediumSoftware EngineerDescribe cross-team collaboration
This interview question evaluates behavioral evidence, ownership, communication, trade-offs, and measurable outcomes in a realistic interview setting. A strong answer for Describe cross-team collaboration states assumptions, handles edge cases, explains trade-offs, and shows how to validate the result clearly.
Behavioral & LeadershipOnsite - OracleMediumBackend EngineerDesign a Distributed Rate Limiter
This problem tests the ability to design a scalable, low-latency distributed system for enforcing traffic quotas across multiple geographic regions with considerations for consistency and burst handling.
System DesignOnsiteDistributed SystemsRate LimitingScalability - OracleMediumSoftware EngineerDesign a Five-Minute Top-K Error Log Service
Design a fault-tolerant, high-throughput log aggregation service that identifies and ranks the top-K microservices with the highest error counts over a sliding five-minute window.
System DesignOnsiteStream ProcessingTop-KDistributed Systems - OracleMediumBackend EngineerDesign a High-Volume Healthcare Data Ingestion Pipeline
This question tests the ability to design a resilient, high-throughput ETL pipeline for sensitive and messy healthcare data, focusing on fault isolation, data integrity, and architectural scalability.
System DesignOnsiteETLData PipelineScalability - OracleMediumSoftware EngineerDesign a Sliding-Hour Top-100 User Event Pipeline
Design a real-time event-time aggregation pipeline to compute the top 100 most active users over a trailing 60-minute sliding window at scale.
System DesignOnsiteStream ProcessingTop-KSliding Window - OracleMediumSoftware EngineerDesign a Software Load Balancer
This problem tests the ability to architect a scalable, fault-tolerant entry point for distributed systems, focusing on request routing, health monitoring, and concurrency management.
System DesignOnsiteLoad BalancingNetworkingDistributed Systems - OracleMediumSoftware EngineerDesign a Synchronously Replicated Hash Map
Design an in-memory key-value storage system utilizing active-passive synchronous replication where writes must commit on both nodes or fail atomically.
System DesignOnsitedistributed-systemssystem-designreplication - OracleMediumSoftware EngineerDesign a URL shortener: short-code generation, fast redirects and scaling
A system design question that asks for a URL shortening service that turns long links into short codes and redirects visitors quickly. It tests requirements and capacity estimates, collision-free short-code generation, redirect caching and status codes, data modeling and partitioning, expiry, analytics and abuse handling.
System DesignOnsite - OracleMediumSoftware EngineerDesign a Video Upload Service for 100 GB Files with Chunked, Resumable Uploads
A system design question about building a service that accepts video uploads of up to 100 GB. It covers moving very large files efficiently, splitting them into chunks, resuming interrupted uploads, choosing storage for bytes and metadata, and scaling to many concurrent uploads.
System DesignTechnical Screen - OracleMediumSoftware EngineerDesign a like-count system for a large video platform with viral-video bursts
A system design question for the like feature of a large video platform. It probes one-like-per-user correctness, serving counts and viewer state at huge read volume, absorbing bursts of likes on viral videos, exact versus approximate counting trade-offs, counter reconciliation, and abuse protection.
System DesignOnsite - OracleMediumSoftware EngineerDesign a photo-sharing social network with follows, media uploads and a home feed
A system design question for a photo and video sharing social network with follows, media uploads and a home feed. It probes estimation, media storage and delivery, feed generation for ordinary and very popular accounts, data modeling, caching, and defending trade-offs under heavy cross-questioning.
System DesignOnsite - OracleMediumSoftware EngineerDesign a rate limiter
This question evaluates a candidate's ability to design scalable, correct distributed rate limiting mechanisms, testing competencies in distributed systems, concurrency control, API gateway behavior, observability, and configurability within the System Design domain.
System DesignOnsite - OracleMediumSoftware EngineerDesign an E-Commerce Recommendation System from Browsing History
This problem tests the ability to architect a scalable, low-latency recommendation engine that translates real-time user activity into personalized product suggestions.
ML System DesignOnsiteSystem DesignRecommendation SystemsScalability - OracleMediumSoftware EngineerDesign an Enterprise Remote Browser Isolation System
This problem tests the ability to architect a low-latency, secure isolation platform that bridges the gap between untrusted web content and enterprise endpoints.
System DesignOnsiteSecurityLow LatencyDistributed Systems
Oracle