Oracle Interview Questions
Practice 34 real Oracle interview questions for 2026. Real questions from actual interviews with detailed solutions — ideal for focused Oracle interview questions practice and interview preparation. This collection centers on Coding & Algorithms and System Design first, then Behavioral & Leadership, Software Engineering Fundamentals, and Machine Learning. Expect a coding-heavy loop: live pair-programming or online assessments that probe arrays, hashes, trees, graphs, and complexity; design rounds that evaluate scalability, APIs, and tradeoffs; and hiring-manager behavioral interviews that test ownership, prioritization, and cross-team impact. Software Engineer candidates should prioritize platform design and algorithm fluency: many questions here revolve around ride‑hailing and ride‑sharing system design, rate limiting, LRU cache implementation, course-completion/topological ordering, and a string/encoding frequency problem, plus behavioral deep dives on project ownership, failure handling, and applying patterns like Command or optimizing CLI tools. Data Scientist interviews at Oracle tend to focus on model evaluation and data issues — medical AI data and evaluation — and algorithmic grid problems such as counting closed or enclosed islands after flooding. Prepare with timed coding practice, mock design reviews, and concise STAR stories that highlight measurable impact.
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Count closed islands in a grid
Problem You are given an m x n 2D grid representing a map after flooding: - 0 = water - 1 = land An island is a maximal 4-directionally connected comp...
Count Interior Islands After Flooding
You are given an m x n binary grid representing land and water. - 1 = land - 0 = water An island is a maximal group of land cells connected 4-directio...
Determine if robot path is bounded
A robot starts at (0, 0) facing North on an infinite grid. It executes a string s consisting of 'G' (move forward 1 unit), 'L' (turn left 90°), and 'R...
How do you prioritize and handle failures?
Answer the following behavioral questions with concrete examples from your experience. 1) Prioritization approach - When you have multiple competing t...
Minimize sum with halving operations
You are given an array of non-negative integers nums and an integer k. In one operation, choose any index i and replace nums[i] with ceil(nums[i] / 2)...
Count Enclosed Islands in a Grid
You are given an m x n grid representing land and water after flooding. - 0 represents land. - 1 represents water. - Two land cells belong to the same...
Find shortest subarray meeting target sum
Given an integer array nums (values may be negative) and an integer T, return the length of the shortest non-empty contiguous subarray whose sum is at...
Extend and optimize an existing CLI tool
You are given: - A short requirements doc for a command-line (CLI) tool that performs a set of concrete tasks (subcommands, flags, inputs/outputs). - ...
Describe cross-team collaboration
Behavioral & Leadership: Cross‑Team Collaboration (Onsite SWE) You are interviewing onsite for a Software Engineer role. Describe a time you had to co...
Explain your project system design
System Design Walkthrough: Project You Owned Context: In an onsite system design interview for a Software Engineer role, you are asked to walk through...
Describe going beyond your scope
Behavioral & Leadership Prompt: Stepping Beyond Scope You are a Software Engineer interviewing onsite. Provide a concise STAR-style story about a time...
Explain Medical AI Data and Evaluation
You are discussing a prior project on medical conversational AI. Assume proprietary production data is limited, so you may begin with open-source heal...
Design scalable, highly available GenAI serving
System Design: Highly Scalable, Highly Available Generative AI Inference Platform Context Design a production-grade deployment for a generative AI tex...
Parse logs and query by time
Implement a parser that converts raw log lines into structured records with fields {timestamp, level, message}. Build an API to support: (a) insert(lo...