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."
Compute Minimum Task Completion Time
You are given n tasks numbered from 0 to n - 1. Each task i takes durations[i] units of time to execute. You are also given a list of directed depende...
Implement an Alternating Tic-Tac-Toe Game
Implement a Tic-Tac-Toe game for two players. Requirements: 1. The board is a standard 3 x 3 grid. 2. Players do not need to be passed into each move....
Explain code complexity and design two games
You are given three independent interview prompts. 1) Code comprehension & complexity - Given two short code snippets (language-agnostic), explain in ...
Shortest Path in a Grid with Blocked Cells
Shortest Path in a Grid with Blocked Cells You are given an m x n grid that represents a floor plan. Each cell is one of: - 0 — an open cell you can w...
Replace Delimited Tokens in a String
Given an input string s and a dictionary replacements mapping keys to replacement strings, replace every placeholder in s with its corresponding value...
Design an In-Memory Pub-Sub Model
Design an object-oriented, in-memory publish-subscribe model. Requirements: - A publisher can publish a message to a topic. - A subscriber can subscri...
Expand Nested Repetition Expressions
Implement a function that expands a valid encoded string containing nested parenthesized repetition expressions. Rules: - Ordinary characters are appe...
Design a distributed job scheduler
Design a distributed job scheduling system for internal engineering teams (think "cron as a service"). Teams register jobs through an API; the platfor...
Answer AI Safety Behavioral Prompts
You are preparing for the final "culture" / hiring-manager rounds of a Software Engineer interview at an AI-focused company (the context here is Anthr...
Prevent Duplicate Request Processing
A client accidentally sends the same network request twice, for example because the user double-clicked a button, the client retried after a timeout, ...
Implement Byte Formatting and Cafeteria Billing
You need to solve two independent programming tasks. Task 1: Format a byte count Given an integer bytes representing a size in bytes, return a formatt...
Design a RAG question-answering system
Scenario Design a Retrieval-Augmented Generation (RAG) system that answers user questions using an internal document corpus (e.g., product docs, polic...
Calculate Bowling Game Score
Implement a function that calculates the total score of a complete ten-pin bowling game. Input: a list of integers rolls, where each integer is the nu...
Design a Scalable News Feed
Design a large-scale social news feed service. Users can: - create posts, - follow and unfollow other users, - open the app to see a personalized home...
Explain Anthropic motivation and leadership stories
Anthropic's non-technical loop for Software Engineers spans two distinct sessions: a Culture / values interview and a Hiring-Manager (HM) round that r...
Design a Ride-Hailing Matching System
Design a ride-hailing matching system similar to a taxi or rideshare application (e.g. Uber, Lyft, DiDi). The interview focuses on the driver-location...
Design a payment system with holds and batching
Scenario Design a payment system that supports: 1. Hold payment (authorization): Place a temporary hold on a customer’s payment method for a given amo...
Design a File Backup System
Design a scalable file backup system. You are given access to basic file-system primitives such as listing directories, reading file metadata, reading...
Design a booking system
Design an online booking system (e.g., for hotel rooms, meeting rooms, or appointment slots). Requirements Cover the following in your design: - Core ...
Solve Matrix and Array Distance Problems
You are asked to solve two coding problems. Problem 1: Shortest Path in a Binary Matrix Given an m x n matrix containing only 0 and 1: - 0 represents ...