Oracle Interview Questions
Practice the exact questions companies are asking right now.
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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...
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...
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...
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...
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 <...
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...
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...
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...
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...
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...
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...
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...
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...
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...
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...
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)...
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 ...
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...
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...