Software Engineer Interview Questions
Practice 4,229 real Software Engineer interview questions for 2026 — real questions from actual interviews with detailed solutions to speed your interview preparation. This collection reflects what top tech firms like Meta, Amazon, Google, DoorDash, and TikTok typically evaluate: rigorous coding and algorithmic problem solving, increasing expectations for end-to-end system design (including GenAI/LLM design at some teams), clear complexity analysis, and reliable engineering judgment under constraints. Expect a multi-stage pipeline: recruiter screen, timed or asynchronous coding assessments, one-to-more live coding rounds focused on data structures and correctness, system-design conversations for mid and senior levels, and behavioral/hiring-manager interviews that probe ownership and collaboration. To prepare, prioritize patterned practice (timed mock interviews and implementation + optimization), learn scalable design frameworks, rehearse concise trade-off communication, and tailor examples to company signals like Amazon’s leadership lens or product/latency focus at delivery and media-driven teams. Consistent, feedback-driven practice that combines problem-solving speed, clean code, and measured design reasoning is the quickest path to offers.
"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."
Design time-based key-value store
Design an in-memory key-value store that supports time-based lookups. Operations Implement a class (or module) with the following methods: 1. set(key,...
Maximize score in 15-sum card game
Problem A deck has 36 cards: 4 suits × ranks 1 through 9 (so there are exactly four 1s, four 2s, …, four 9s). Suits do not affect scoring; only ranks ...
Compute dot product of sparse vectors
Problem You need to compute the dot product of two sparse vectors of the same dimension. Each vector is provided as a list of non-zero entries sorted ...
Maximize coins collected by 3-step pieces
You are given a 1D board of length N. Each cell is in one of three states: - Empty - Piece (a movable token) - Coin (collectible) In one move, you may...
Count ways to make change (DP)
Problem You are given an integer amount and an array of positive, distinct integers coins, where each coin value can be used unlimited times. Return t...
Answer common graph, grid, and array tasks
Problem 1: Largest continuous island after filling sea (1D) Humans can convert ocean cells into land by filling them. Input - islands: a 1D array of l...
Group strings that are anagrams
Given an array of strings, group the strings into lists such that each list contains strings that are anagrams of each other. Definition Two strings a...
Schedule prerequisite classes with retakes
Problem You are building a course-taking engine. Each course is represented as an object: - id (unique identifier) - prevCoursesList: a list of prereq...
Solve Three Coding Interview Problems
The coding round contained three independent problems: 1. Merge two sorted arrays and remove duplicates. Given two sorted integer arrays a and b, retu...
Implement a versioned recipe management system
You are asked to implement an in-memory Recipe Management System (similar in difficulty to a simple banking/in-memory DB exercise). The system support...
Implement Sliding Windows and LRU Cache
You are given two coding tasks. Task 1: Longest Subarray of Ones Given a binary array nums and an integer k, return the maximum length of a contiguous...
Implement a Cursor-Based Text Editor
Implement an in-memory text editor that maintains a mutable string and a cursor position between characters. The editor starts with an empty document ...
Explain a past project and critique a prior team
Interview prompts 1. Project deep dive: Pick a past project you worked on and walk through it end-to-end. Be ready to use a whiteboard to explain arch...
How would you throttle a crawler?
The crawler above is now a production service. Expanding each page requires an outbound HTTP or API call to fetch its links, and upstream services may...
Check and infer custom alphabet
You are working with an unknown language that uses a custom alphabetical order, such as ['a', 'd', 'c', 'b', ...]. Implement the following: 1. Check s...
Compare RDBMS vs NoSQL and containers
Answer the following engineering fundamentals questions: 1) Compare RDBMS and NoSQL databases: key trade-offs (schema, transactions/ACID, consistency,...
Write SQL to sum city population by name
You have four relational tables: - country(country_id, name) - state(state_id, country_id, name) - city(city_id, state_id, name) - zip(zip_code, city_...
Implement popup and redirect in JavaScript
You are working in a browser environment and must use vanilla JavaScript only (no external libraries). Task Implement a function showPopupAndRedirect(...
Implement cd and merge intervals
Problem 1: Implement a simplified cd command You are given: - cwd: the current working directory as an absolute Unix path (starts with /). - path: a t...
Parse payroll file and answer queries
You are given a payroll "file" as a StringIO (file-like) object in Python. The underlying text represents manually-entered payroll data. Assume the fo...