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 a Cache with Hit Counts
Design a key-value cache that supports get(key), put(key, value), and delete(key). In addition, the cache must track how many successful reads each ke...
Check Meeting Attendance With Breaks
You are given a list of appointment intervals for a single day and a mandatory break time between any two consecutive appointments. Each interval is r...
Design an object store with deduplication
System Design Prompt Design a simplified cloud object storage service (similar to an object store) that allows users to upload and download files. The...
Design a Customer Review Page
Design the customer review page for a large marketplace or local-services platform. The page should support: - Aggregate ratings, such as average scor...
Implement a Snapshot Set Iterator
Design and implement a mutable SnapshotSet data structure. The set stores unique keys and supports normal set operations, plus snapshot iterators. Imp...
Implement Article Vote Tracking
We are building an in-memory vote management service for an online news platform. Users can upvote or downvote published articles, and we want to trac...
Find minimal rate k and subset sum
Question LeetCode 875. Koko Eating Bananas — Given vault sizes [3, 6, 7, 11] and time h = 8 hours, find the minimum integer rate k (vault units per ho...
Design an ads audience targeting system
Problem Design an ads audience targeting system that allows advertisers to upload large user lists and then target (or exclude) those users when servi...
Find Each Cell's Nearest Source
Given an m x n grid containing 1 for source cells and 0 for regular cells, compute for every cell the shortest 4-directional distance to any source ce...
Compute Turnstile Crossing Times
You are given n people waiting to use a single-door turnstile. Each person has: - time[i]: the time when person i arrives at the turnstile. - directio...
Reverse Linked List Groups
Given the head of a singly linked list and a positive integer k, reverse the list in consecutive groups of size k. Unlike the common variant where a f...
Design a real-time chat system with hot groups
Design a real-time chat system (similar to an in-app messaging feature) that supports: - 1:1 and group conversations - Real-time delivery over WebSock...
Implement an Arithmetic Expression Evaluator
Implement an arithmetic expression evaluator. Part 1: Given a string expression containing non-negative integers, spaces, and the operators '+', '-', ...
Implement a hierarchical file store
Implement a simplified in-memory file store. The store uses absolute Unix-style paths such as /, /docs, and /docs/readme.txt. A path component contain...
Implement a Time-Aware Task Manager
Design and implement an in-memory task management component. Each task belongs to one user. A task has a unique task ID, arbitrary task content, a cre...
Design a delivery cost system
Design an object-oriented, in-memory Delivery Cost System for a food-delivery company. Drivers register with an hourly rate, completed deliveries are ...
Design alerting for application-to-exchange mappings
Problem: Alerting design for application→exchange mappings You are building a service that receives an ordered stream of mapping events: - register(ap...
Merge Multiple Sorted Arrays
You are given n sorted arrays of integers. Merge all arrays into one sorted array and return it. Requirements: - Preserve duplicate values. - Handle e...
Design an Ad Frequency Capping System
Design a frequency capping system for an advertising platform. A frequency cap limits how many times a user can be shown an ad, campaign, line item, o...
Determine Whether a Word Exists in a Graph
You are given a graph as a list of node objects. Each node contains a character and a list of neighboring nodes that can be visited next. Design and i...