Software Engineer Interview Questions
Practice 4,657 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.
"I got asked a hardcore MCM DP question and I saw it on PracHub as well. Solved that question in 5 minutes. Without PracHub I doubt I could solve it in 5 hours. Though somehow didn't get hired, perhaps I guess I solved it too fast? /s"
"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."
"I was skeptical about the 'real questions' claim, so I put it to the test. I searched for the exact question I got grilled on at my last Meta onsite... and it was right there. Word for word."
"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."
"The solution quality is insane. It covers approach, edge cases, time complexity, follow-ups. Nothing else comes close."
"Legit the only resource you need. TC went from 180k -> 350k. Just memorize the top 50 for your target company and you're golden."
"PracHub Premium for one month cost me the price of two coffees a week. It landed me a $280K+ starting offer."
"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."
How Would You Test a System That Counts the Leaves on a Tree?
How Would You Test a System That Counts the Leaves on a Tree? You are handed a system whose job is to count the number of leaves on a (potentially ver...
Implement a Simple Memory Allocator
Design and implement a simplified memory allocator exposing malloc(size) and free(ptr) over a single fixed-size heap (a contiguous byte array). The al...
Find Unreachable Objects in a Heap Graph
Find Unreachable Objects in a Heap Graph Heap objects now contain references to other addresses. Each object is represented as [address, references], ...
Find Heap Objects Not Referenced by the Stack
Find Heap Objects Not Referenced by the Stack Each heap object has a unique integer address. In this first version, heap objects do not reference one ...
Design CI/CD Build Caching
You are given a simple CI/CD platform. Users submit workflow definitions in YAML. A workflow contains multiple jobs, and for this exercise the jobs ru...
Solve a Jigsaw Puzzle
You are given a collection of jigsaw puzzle pieces. Each piece has four edges — top, right, bottom, and left — and a helper function match(edgeA, edge...
Discuss Leadership, Motivation, and AI Safety Values
Discuss Leadership, Motivation, and AI Safety Values Prepare concise, evidence-based answers for an exploratory interview covering your current leader...
Check Whether Digits Are Monotone Increasing
Check Whether Digits Are Monotone Increasing Problem A non-negative integer has monotone increasing digits when every adjacent pair of digits is non-d...
Validate AI-Generated Code Safely
Generative AI coding tools are now part of many teams' day-to-day workflow, and interviewers increasingly want to know not just whether you use them, ...
Design a Multi-Channel Notification System
Design a Multi-Channel Notification System Design a notification platform that accepts product events and delivers timely messages through channels su...
Answer Hiring Manager Behavioral Questions
Hiring Manager (Behavioral) Round — Rippling, Software Engineer In the hiring-manager round at Rippling, you are asked to prepare and deliver answers ...
Design a Played-By Summary System
Design the backend system that powers a single line of social proof on a game's detail page, such as: > Alice, Bob, and 12,345 people have played this...
Design an Automated Jira-Ticket-to-PR System
Design an Automated Jira-Ticket-to-PR System You are building an internal developer-productivity tool. Your company already runs a CI pipeline that pr...
Build a Banking System with Activity Rankings
Build a Banking System with Activity Rankings Problem Implement an in-memory banking system that processes these operations: - CREATE_ACCOUNT account_...
Prove an Incremental Shuffle Is Uniform
Prove an Incremental Shuffle Is Uniform Consider this in-place shuffle for an array of length n: `text for i from 0 through n - 1: j = a uniformly...
Perform an External Merge Sort with a Heap
Perform an External Merge Sort with a Heap Sort an integer sequence using the two phases of external merge sort: create sorted runs that fit within a ...
Simulate Threshold Infection Efficiently
Simulate Threshold Infection Efficiently You are given an m x n grid, a set of initially infected cells, and an integer threshold k. Time advances in ...
Debug Python LRU Cache-Key Construction
Debug Python LRU Cache-Key Construction The source reports a Python LRU-cache bug in key construction from args and **kwargs but does not provide the ...
Compute a Point Set's Bounding Rectangle
Compute a Point Set's Bounding Rectangle Given two-dimensional integer points, return the smallest axis-aligned rectangle containing every point. Repr...
Product of Array Except Self Without Division
Product of Array Except Self Without Division Given an integer array, return an array in which output[i] is the product of every input element except ...