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."
Explain Collaboration, Ambiguity, and Prioritization
Answer the following behavioral interview prompts using concrete examples from past projects: 1. Describe a time you collaborated with other people on...
Implement an Expiring Record Store
Implement a level-based in-memory record store. The store contains records identified by a string key. Each record contains fields, where each field i...
Design a Parking Lot
Problem In an AI-assisted coding round, design the core object model and APIs for a parking lot system. The system should support: - Multiple floors, ...
Count Visits in One Minute
Design a system that can report the number of website visits in the most recent 1-minute sliding window. The website may receive high traffic, and the...
Design expense rules engine and return type
Design a Rules Engine for Corporate Card Expenses Context We offer a corporate credit card that employees use for business expenses. Managers set poli...
Answer Manager Behavioral Prompts
In a hiring-manager interview, prepare concise STAR-style answers for the following prompts: 1. Describe a significant project you led or contributed ...
Find the Most Common Visit Pattern
You are given a list of web visit logs. Each log record contains userId, timestamp, and page. For each user, sort that user's visits by timestamp. A l...
Compute effective permissions on DAG and prune tree
Problem A — Effective allow/disallow letters on a DAG You are given a directed acyclic graph (DAG) with n nodes labeled 0..n-1. Each node u contains t...
Rearrange Tasks With Cooldown
You are given a list of tasks, where each task is represented by an uppercase letter, and an integer cooldown. Rearrange the tasks into an execution o...
Implement a random fixed-size load balancer
Problem: Build a simple load balancer Implement a minimal in-memory load balancer that routes each incoming request to one backend node chosen uniform...
Design a Donation Platform
Question Design an online donation platform that lets users discover and contribute to charity campaigns or nonprofit organizations. Payment execution...
Remove duplicates and find constrained longest subsequence
You are given two independent coding tasks. Task 1: Remove duplicates from a linked list Given the head of a singly linked list (not necessarily sorte...
Design a geography-aware virtual card service
Scenario You are asked to design a virtual card number product for a financial app. Users can generate virtual card numbers to pay online/in-store. Th...
Count Referral Descendants
You are building a referral analytics feature. Each referral relationship is represented as a directed pair (referrer, referredUser), meaning referrer...
Generate Data Labeling Schedules
A data labeling platform manages tasks, AI models, and human annotators. Each entity has a 1-indexed string ID. You are given four integers: totalTask...
Design a Credit Scoring Platform
Design a credit-scoring platform for 300 million users. The platform can obtain user credit data from external credit bureaus. It should ingest bureau...
Implement Timeout Refund Workflow
You are given a skeleton workflow engine for order processing. A workflow is a directed graph of nodes. Each node receives an OrderContext and returns...
Minimize Branch Merge Conflicts
You are given several feature branches that must all be merged into the main branch. Each branch contains a sequence of commits, and each commit modif...
Design Food Ratings and Driver Payouts
Design the backend for a food-delivery product (think DoorDash-style marketplace). The system has two distinct surfaces that you must address together...
Design a production file storage service
System Design: Production-Grade File Storage Service Problem Design a production-grade file storage service with the following APIs, semantics, and co...