Software Engineer Interview Questions
Practice 4,824 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."
Stack Machine Interpreter with Typed Int and String Values
You are building an interpreter for a simple stack machine. The machine has a single stack, and every value on the stack is one of exactly two primiti...
Defend a Schema Decision Through a Real Technical Challenge
Defend a Schema Decision Through a Real Technical Challenge Choose a system you worked on where the data model materially affected correctness, scalab...
Solve Subset Sum And Return All Matching Subsets
Given an array of non-negative integers and a target, first determine whether any subset sums to the target using dynamic programming with O(target) s...
Count Length-3 Chat Substrings with a Vowel
You are developing an automatic moderation system for a chat application that detects simple linguistic patterns. Given a string chatMessage, count ho...
Show Teamwork and Drive Through Difficult Engineering Situations
Show Teamwork and Drive Through Difficult Engineering Situations Prepare two evidence-based examples from your experience. In the first, a peer asked ...
Find a Valid Task Execution Order with Dependencies
You are building the task scheduler for a CI/build system. There are n build tasks labeled from 0 to n - 1. Some tasks cannot start until certain othe...
Vertical Order Traversal of a Binary Tree
Vertical Order Traversal of a Binary Tree You are given the root of a binary tree. Return the vertical order traversal of its nodes' values — that is,...
Increment a Digit-Array Integer by One
Increment a Digit-Array Integer by One You are given a non-empty array digits in which each element is a single decimal digit (0-9). The array represe...
Group Anagrams
Group Anagrams Given an array of strings words, group together all strings that are anagrams of one another and return the groups. Two strings are ana...
Quadtree for 2D Geospatial Points
Quadtree for 2D Geospatial Points Design and implement a point quadtree that stores geographic locations on a 2D plane and supports efficient axis-ali...
Elements Occurring More Than n/3 Times in a Sorted Array
You are given a sorted (non-decreasing) integer array nums of length n, where n >= 3. Return every distinct value that occurs strictly more than n / 3...
Highest Salary Using Java Streams
Highest Salary Using Java Streams You are given a list of Employee objects. Each Employee is a plain Java object (POJO) with the following fields: `ja...
Maximum-Length Unique-Character Subset
Maximum-Length Unique-Character Subset You are given a list of strings. Choose a subset of them and concatenate the chosen strings; the concatenation ...
Deep Equality of Two Records
Deep Equality of Two Records You are given two records (think of them as instances of a struct / class / nested object). Write a function that decides...
Longest Run of Ones After One Flip
Longest Run of Ones After One Flip You are given a binary array nums, where every element is either 0 or 1. You may flip at most one 0 to a 1 (you are...
Find Common Free Time Slots Across Calendars
Find Common Free Time Slots Across Calendars You are building a scheduling assistant on top of a shared calendar product. Each participant has a list ...
Multi-Agent Collision Simulator (Unicycle Kinematics)
Multi-Agent Collision Simulator (Unicycle Kinematics) You are given $N$ agents moving in a 2D plane. Each agent is a disk of fixed radius and moves ac...
Course Schedule Feasibility
This question tests graph traversal skills and the ability to detect cycles in a directed graph, a core competency in algorithm interviews. It falls u...
Palindrome After Deleting at Most One Character
This question evaluates a candidate's ability to reason about two-pointer string traversal and palindrome verification under a single edit constraint....
Character Frequency Count in a String
This question tests a candidate's practical ability to traverse strings and use hash-based data structures for frequency counting while preserving ins...