Software Engineer Interview Questions
Practice 4,236 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 Distributed Rate Limiter
Design a distributed rate limiting system for a large API platform. The platform has many API gateways and backend services running across multiple re...
Design a prompt playground
Design a prompt playground for developers and prompt engineers. The product lets users write prompts, choose model settings, run prompts against AI mo...
Design a Real-Time Top-K Ranking System
Design an object-oriented real-time Top-K ranking system. The system receives score updates for many entities, such as users, drivers, restaurants, or...
Design a One-on-One Chat Service
Design a scalable one-on-one chat service. The service should allow registered users to exchange private text messages in real time across web and mob...
Design a Security Monitoring Framework
Design a security monitoring framework for a cloud infrastructure environment. The framework should monitor hosts and workloads for suspicious behavio...
Design a Distributed Crossword Solver
Design a distributed solver for crossword-like word puzzles. You are given a grid containing blocked cells and empty cells, plus a dictionary of valid...
Design Multi-Dimensional Request Rate Limiting
Design a rate limiter for a backend service. Part 1: Build a standard rate limiter that can limit incoming requests by a key such as user ID, IP addre...
Design ad frequency capping
Design a frequency capping system for an advertising platform. The system must ensure that a user does not see the same advertisement more than a conf...
Design a Book Price Aggregator
Design a book purchasing marketplace where your service acts as an intermediary between customers and hundreds of partner bookstores. A customer submi...
Validate AI-Generated Code Safely
Describe your experience using generative AI tools for software development. How do you ensure that AI-generated code is correct, maintainable, and sa...
Design an Instagram-like Feed System
Design an Instagram-like photo-sharing application. Your design should support: - Users creating posts containing photos or short videos. - Users foll...
Design a Distributed Crossword Solver
Design a scalable service that solves crossword-style fill-in puzzles. A request contains a rectangular grid with blocked cells, empty cells, optional...
Design a Charity Donation Website
Design a charity donation website that allows donors to make one-time or recurring donations to charitable campaigns. The site should integrate with a...
Design an Online Coding Judge Platform
Design an online coding practice and judging platform. The platform should let users browse programming problems, write and submit code in multiple la...
Build a Durable Key-Value Cache
Design and implement an in-memory key-value cache that uses a write-ahead log for durability. The cache should support at least the following operatio...
Design Asset Storage System
Design a high-level storage system for digital assets. The system must store and serve multiple asset types, including text documents, images, and vid...
Design a Text-to-Video Generation System
Design a Sora-like text-to-video generation platform. Users submit a text prompt, optional generation settings, and possibly optional conditioning med...
Debug Validation Error Aggregation
You are given a Python validation library similar to Colander. A schema node can run multiple validators. Validators may raise validation errors, and ...
Design Restaurant Search and Monitoring
Design the search component for a food delivery application. Users should be able to search for restaurants and menu items by text query, for example ...
Solve Three Array and Matrix Path Problems
You are given three independent coding tasks. For each task, design an algorithm, implement it, and analyze its time and space complexity. 1. Find the...