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."
Maximize revenue by choosing one query type
You are given a virtual warehouse that can execute queries. There are n query types, and you must choose exactly one query type to run repeatedly for ...
Design a Global Marketing Email Platform
Design a marketing email system for a large consumer marketplace. The business wants to run campaigns that may send 2-3 marketing emails within a 15-m...
Answer suffix maximum-frequency queries
You are given: - An integer array nums of length n. - An integer array queries of length m, where each queries[k] is an index i (0-based) into nums. F...
Design a banking ledger for deposits/withdrawals
Banking/OO Design: Account Ledger Design a minimal in-memory or persistent component for a bank account system that supports: - deposit(account_id, am...
Check if each prefix forms 1..k permutation
You are given an integer array arr of length n that is a permutation of the numbers 1..n (each number appears exactly once), but in arbitrary order. F...
Design a high-concurrency LLM inference service
You are designing an LLM inference platform that serves interactive user requests (chat/completions) on GPUs. Goals - Support high concurrency with pr...
Debug and extend a streaming chat app
Scenario You are given a small codebase for a web chat UI that calls an LLM API (similar to a ChatGPT-style interface). You can run it locally. During...
Decompress encoded string with nested repeats
Given an encoded string, decompress it into its expanded form. Encoding rules: - Parentheses (...) denote a group. - A repetition count is written in ...
Solve four algorithmic coding tasks
You are given four independent coding tasks. They may be solved in any order, and partial test-case credit is awarded for each task. The tasks are rou...
Design a real-time delivery dashboard
System Design: Real-Time Delivery Operations Dashboard Context Design a real-time operations dashboard for a two-sided delivery platform. The dashboar...
Design a News Feed and Mail Service
Design the following systems: 1. Aggregate news feed Build a service that ingests articles from many publishers, deduplicates and ranks them, and s...
Simulate document assignment to indexers
You are given a system with m parallel indexers (workers), numbered from 0 to m-1. Documents arrive over time and are placed in a processing queue. Ea...
Explain Compiler Pipeline and LLVM Backend
You are interviewing for a compiler engineer role. Explain the major stages of a modern compiler, then discuss common optimization techniques and how ...
Implement a CSV dataset join
Implement joinDataSet(fieldName, customerFile, processorFile, skipUnmatched). You are given two datasets represented as List<String>, where: - custome...
Describe Using AI at Work
Describe how you have used AI tools in your day-to-day work. In your answer, explain the business or engineering problem, how AI helped, what safeguar...
Explain conflict, ownership, and AI use
Question Prepare structured answers for an Amazon-style behavioral interview (intern / early-career software engineer) that probes leadership-principl...
Implement and analyze custom attention
Implement Scaled Dot-Product Attention in PyTorch (from scratch) Context You will implement a numerically stable, vectorized scaled dot-product attent...
Assign Ads to Browser Positions
Implement a function that assigns ads to browser positions for a single user. You are given: - positions: a list of browser position identifiers, such...
Describe mentorship, conflict, and project impact
Behavioral questions discussed in the interview included topics like: - Walk through a project you worked on end-to-end. What was the goal, what trade...
Implement Cache and Rotate Matrix
Solve the following two independent coding tasks. Task 1: Implement an LRU Cache Design a data structure LRUCache that stores integer keys and integer...