Software Engineer Interview Questions
Practice 4,276 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 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 ...
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. Funct...
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...
Search Words in a Character Grid
You are given a 2D grid of lowercase English letters. Part 1: Given a single target word, determine whether the word can be formed by a path in the gr...
Implement Social Follow Recommendations
Implement an in-memory social network graph with three operations: - follow(followerId, followeeId): record that one user follows another user. Duplic...
Find User Airport at a Time
You are given a list of flight records. Each record contains: - user_id: the traveler identifier - departure_airport: the airport where the flight sta...
Design Real-Time Driver Pay Aggregation
Design a production system that ingests a high-volume stream of delivery-order events and continuously computes each driver's daily pay. The system sh...
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 a Collaborative Todo List
Design a collaborative todo-list service. The service should allow users to create shared lists, add and edit todo items, assign owners, set due dates...
Minimize Travel Assignment Cost
You are given n people who each need to travel to exactly one of two cities: San Francisco or New York. The input is an array costs, where costs[i] = ...
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...
Validate a Shopping Cart
You are building the cart validation logic for a food-delivery application. Implement a function validateCart(cart, catalog) that checks whether a cus...
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 distributed job scheduler
Design a distributed job scheduling system for internal engineering teams. The system should support: - one-time jobs scheduled for a future timestamp...
Design a news aggregator system
System Design: News Aggregator Design a news aggregator (similar to a “Top stories”/Google News style product) that ingests articles from many publish...
Implement stream queries and bounded-difference subarrays
Solve both coding tasks. Task 1: Track the first non-repeated number in a stream Design a data structure that supports a stream of integers. Implement...
Fix a Corrupted Bootloader Instruction
You are given a bootloader program as a list of text instructions. Each instruction has an opcode and a signed integer value, such as plus +1 or jump ...
Minimize Circular Redistribution Cost
You are given n warehouses arranged in a circle. products[i] is the number of products initially stored at warehouse i. You may choose exactly one glo...
Design Camera Health Monitoring
Design a system for monitoring the health of 10 million cameras. Each camera sends one heartbeat every minute. The system should continuously report h...
Design a Weighted Log Distributor
Design a high-throughput log distributor. Agents running on application and infrastructure hosts send packets to the distributor. Each packet may cont...