Oracle Interview Questions
Practice 34 real interview questions from Oracle. Covers Coding & Algorithms, Behavioral & Leadership, System Design, Software Engineering Fundamentals. For roles including Software Engineer, Data Scientist.
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"I've used LC, Glassdoor, and random Discords. Nothing comes close to the accuracy here. The questions are actually current — that's what got me. Felt like I had a cheat sheet during the interview."
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"Literally just signed a $600k offer. I only had 2 weeks to prep, so I focused entirely on the company-tagged lists here. If you're targeting L5+, don't overthink it."
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"I honestly don't know how you guys gather so many real interview questions. It's almost scary. I walked into my Amazon loop and recognized 3 out of 4 problems from your database."
"Discovered PracHub 10 days before my interview. By day 5, I stopped being nervous. By interview day, I was actually excited to show what I knew."
"I recently cleared Uber interviews (strong hire in the design round) and all the questions were present in prachub."
"The search is what sold me. I typed in a really niche DP problem I got asked last year and it actually came up, full breakdown and everything. These guys are clearly updating it constantly."
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...
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...
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 ...
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 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 ...
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 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 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...
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...
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...
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...
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 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...
Answer Behavioral Leadership Questions
The interview included a leadership-focused behavioral round. Prepare strong responses to the following prompts: - Describe a difficult challenge you ...
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). - ...
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 <...
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 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...
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...