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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Compute letter frequencies from encoded string
Problem You are given an encoded string s representing a string of lowercase English letters (a–z). The encoding follows these rules: 1. Letters a to ...
Answer Behavioral Leadership Questions
The interview included a leadership-focused behavioral round. Prepare strong responses to the following prompts: - Describe a difficult challenge you ...
Deep-dive a project and show ownership
You will be asked to do a deep dive on one or two past projects. The interviewer(s) may probe heavily on technical details and leadership behaviors. P...
Solve Five Coding Problems
The interview included several coding tasks. Solve each of the following and discuss time and space complexity: 1. Given a 2D grid where '1' represent...
Apply operations efficiently using Command pattern
You are given an initial state and a list of operations that should be applied to it. Setup - The state can be thought of as a mutable object (e.g., a...
Return a valid course completion order
You are given an integer n representing n courses labeled 0..n-1 and a list of prerequisite pairs prerequisites, where each pair [a, b] means you must...
Design a Ride-Hailing Platform
Design a large-scale ride-hailing platform similar to a taxi-booking app. The system should allow riders to request trips, match them with nearby driv...
How do you tackle unfamiliar problems?
Behavioral questions 1. Project deep dive: Briefly introduce yourself and walk through 1–2 past projects you worked on. Pick one problem you solved th...
Design a rate limiter
Design a rate limiting system for an API gateway. Your design should address: - Rate limits such as "N requests per second/minute" per key (e.g., per ...
Find users with at least one valid session
You are given: - A list of log entries logs, where each entry is a string in the format: ` "userId action timestamp" ` - userId is a non...
Implement in-memory data structures and booking API
Part A — Implement a simplified Redis-like in-memory store (Go) Implement an in-memory key-value store that supports string values and list-of-strings...
Maximize area between vertical lines
Problem You are given an integer array h where h[i] represents the height of a vertical line drawn at x-coordinate i. Choose two different indices i <...
Design structure for first unique login user
You are given an online stream of user login events. Each event is a user ID (e.g., an integer or string) indicating that this user has just logged in...
Implement an LRU cache
Design and implement an in-memory cache that evicts entries using the Least Recently Used (LRU) policy. The cache should store key–value pairs and sup...
Implement an LRU cache
Design and implement a data structure for a Least Recently Used (LRU) cache with a fixed capacity. The cache must support: - get(key): return the valu...
Design a ride-sharing system (Uber)
Design a large-scale ride-sharing platform similar to Uber. Cover: - Rider and driver apps (account, availability, requesting rides). - Real-time driv...
Count Closed Islands
You are given an m x n binary grid representing terrain after flooding. - 0 = land - 1 = water A land region is an island if its land cells are connec...
Count anagram-based replacements per phrase
Problem You are given: - phrases: a list of strings, where each string is a phrase containing words separated by single spaces. - words: a list of str...
Walk through your resume and projects
Behavioral Prompt: Resume Walkthrough and Project Deep Dive (Software Engineer Onsite) Context You are interviewing for a Software Engineer role in an...
Solve three DSA problems: trie, window, intervals
1) Design and implement an autocomplete service. Support insert(word) to add a word and suggest(prefix) to return up to five existing words that start...