Software Engineer Interview Questions
Practice 4,429 real software engineer interview questions for 2026. Covers top employers like Google, Amazon, OpenAI, and Uber — real questions from actual onsites with detailed solutions — and is built for focused interview preparation. This collection emphasizes coding and algorithms first, then system design, performance, and role-specific domains so you can train the exact skills interviewers test. What’s distinctive: coding rounds still dominate at every company, Google often emphasizes algorithms and distributed-systems thinking, Amazon commonly probes scalable-services design and operational tradeoffs, OpenAI leans toward ML systems, model deployment and inference-scaling problems, and Uber typically asks real-time routing, geospatial and consistency challenges. Expect live coding, pair-programming, and whiteboard/system-design sketches. To prepare efficiently, drill medium-to-hard algorithm problems with time limits, practice end-to-end system design sketches focused on capacity and reliability, and rehearse concise behavioral stories that show ownership and impact.
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"Believe me i'm a student here jn US. Recently interviewed for MSFT. They asked me exact question from PracHub. I saw it the night before and ignored it cause why waste time on random sites. I legit wanna go back and redo this whole thing if I had chance. Not saying will work for everyone but there is certainly some merit to that website. And i'm gonna use it in future prep from now on like lc tagged"
"10 years of experience but never worked at a top company. PracHub's senior-level questions helped me break into FAANG at 35. Age is just a number."
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"Got a Google recruiter call on Monday, interview on Friday. Crammed PracHub for 4 days. Passed every round. This platform is a miracle worker."
"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."
"Coaches and bootcamp prep courses cost around $200-300 but PracHub Premium is actually less than a Netflix subscription. And it landed me a $178K offer."
"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."
Schedule dependent services with layered startup
You are given N services and dependency pairs (u -> v) meaning u must start before v. 1) Produce a valid startup order if one exists; otherwise detect...
Implement 2D word search variants and analyze complexity
Given an m x n grid of uppercase letters board and a string word, implement two related functions: ( 1) Fixed-direction search: Return true if word ap...
Implement compile-time function type verification
Implement a C++20 compile-time utility to verify whether a callable matches a target function type. Requirements: create a primary template is_callabl...
Solve grid shortest path with BFS
Given a 2D grid containing 0s (open cells) and 1s (walls), and coordinates for a start (sr, sc) and a target (tr, tc), return the length of the shorte...
Deep dive into a past project
Deep Dive: Past Project You Led or Owned Provide a thorough walkthrough of a project where you had ownership or leadership responsibility. Cover the f...
Describe a service performance challenge
Behavioral: Improving a Production Service's Performance Describe a challenging time you improved the performance of a production service. Include the...
Solve array modulo and parentheses tasks
Implement two tasks: 1) Count subarrays by modulo remainder - Input: integer array nums (length n), integers K (1 ≤ K ≤ 10^ 4) and R (0 ≤ R < K). - Ou...
Parse a deeply nested JSON
Parse a deeply nested JSON Given a JSON document with approximately five levels of nesting, write code to traverse it and extract specified fields whi...
Design image upload end-to-end
Design image upload end-to-end System Design: End-to-End Image Upload Pipeline Context Design an end-to-end system that handles user picture uploads f...
Describe a bug you owned end-to-end
Behavioral Question Tell me about a time you personally found and fixed a bug. Cover: - What the bug was and how it was discovered - How you narrowed ...
Explain React and Firebase data interaction
Question You built a web app with React and Firebase. Explain how a React frontend typically reads/writes data with Firebase, and how you would struct...
Design personalized discovery recommendations
You are designing a personalized "Discovery" page for an AI-powered search/Q&A platform (similar to Perplexity). The Discovery page should show each u...
Design trending queries ranking system
You are designing a system to power the Top Trending Queries section on the home page of an AI search/Q&A platform (similar to Perplexity). The produc...
Solve weighted pick and product except self
Question LeetCode 528. Random Pick with Weight LeetCode 238. Product of Array Except Self https://leetcode.com/problems/random-pick-with-weight/descri...
Analyze food-delivery data
Analyze food-delivery data You are given data for a food-delivery platform: a set of restaurants (each with a menu of items and prices, plus a geograp...
Discuss leadership and conflicts
Discuss leadership and conflicts Behavioral & Leadership: Collaboration and Conflict Resolution Context You are interviewing for a Software Engineer r...
Review tech stack and best practices
Review tech stack and best practices Take-home Technical Questionnaire (System Design & Engineering) Context As part of a take-home technical screen f...
Find concatenated words in list
Question LeetCode 472. Concatenated Words – Given an array of strings words, return all words that are concatenations of at least two shorter words al...
Solve odd-string, digit swap, patient slot assignment
Question Task 1 – Odd-occurrence string: Write a function that, given an integer N (1..200 000), returns a length-N lowercase string in which every le...
Find LCA in organization tree
Find LCA in organization tree Given an organizational hierarchy tree, return the lowest common organization (parent node) for two or more employees (≥...