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 Cloud File Storage Service
Design a cloud file storage and collaboration service similar to Google Drive or Dropbox. At a high level, the service must let users store files in a...
Design a single-node persistent in-memory cache
Scenario Design a single-machine in-memory cache used by a web service to serve concurrent read and write requests. This is a deliberately low-level s...
Design Camera Health Monitoring
Design a system that monitors the health of 10 million cameras and continuously reports, in near real time, how many devices are healthy and how many ...
Implement a Recipe Cart
You are building a shopping cart for a cooking app. The system is initialized with: - A recipe catalog: each recipe_name maps to a list of ingredients...
Design a Slack-Like Messaging Platform
Problem Statement Design a Slack-like team messaging platform that serves millions of daily active users with low-latency delivery across multiple reg...
Implement Connect Four with bottom push-up
Implement a Connect Four variant with bottom push-up. In standard Connect Four a dropped disc falls to the lowest empty cell of a column. In this vari...
Implement topological sort and tree boundary traversal
You are given two separate coding tasks. Problem A — Order courses with prerequisites You have n courses labeled 0..n-1 and a list of prerequisite pai...
Implement IP Address Arithmetic
Implement an IP address utility library. Support the following operations: 1. Parse an IPv4 address in dotted-decimal form, such as 192.168.0.1. 2. Gi...
Search Words in a Character Grid
You are given a 2D grid board of lowercase English letters with m rows and n columns. A word can be constructed from letters of sequentially adjacent ...
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...
Count White Balls After K Steps
You are given a ring of N positions indexed from 0 to N-1. - At each position i, there is initially one ball whose color is either white or black. - E...
Design a user behavior tracking system
Problem Design a User Behavior Tracking System that collects and analyzes user events from mobile and web applications across multiple products. The s...
Design rolling-window conversation score tracker
Design a class that tracks conversation scores over a rolling time window. Requirements You are given a window size W (in seconds) at initialization t...
Implement an In-Memory File System
Implement an in-memory file system directory management tool. Your tool should support the following operations: 1. Create a file in a directory. 2. C...
Design Real-Time Trending Likes
Design a real-time analytics service for a large social platform. The service receives like and unlike events for posts. It must support the following...
Design a pub-sub replay system
Assume you have a distributed publish-subscribe messaging system with topics, publishers that write messages, and subscribers that consume them. Desig...
Design Collaborative Document Editing
Design a web-based collaborative document editing system similar to Google Docs. The system should allow multiple users to create, edit, and share ric...
Design an RSS News Feed Service
Design an RSS news feed service. The service lets users subscribe to RSS sources, ingests articles from those sources on a schedule, stores article me...
Implement Courier Delivery Cost Tracking
Design and implement a small in-memory cost-tracking service for food-delivery couriers. Each courier has a unique driverId and an hourlyRate. A deliv...
Implement a Circular Buffer
Implement a fixed-capacity circular buffer. A circular buffer stores elements in insertion order, supports removal of the oldest element, and reuses s...