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 one-to-one chat system
Design a one-to-one (1:1) chat system for a web application — the kind of direct-messaging feature where two users can send each other text messages i...
Add One to Digit Array
You are given an array of decimal digits representing a non-negative integer. The most significant digit is at index 0, and the array contains no lead...
Build a GPU VM Fleet CLI
You are given a repository containing three mock cloud-provider servers that simulate GPU VM providers — Crusoe Cloud, Lambda Cloud, and Nebius AI Clo...
Design a Hosted Notebook Platform
Design a hosted notebook platform for interactive code execution — a cloud-based notebook service in the spirit of Google Colab, Deepnote, or Hex — wh...
Generate a ride map image via POST API
You are given a local JSON file ride-simple.json containing a recorded bike ride as an ordered list of GPS points. Your job is to turn this ride into ...
Build a Reliable Streaming Chat UI
You are building a React-based chat interface where assistant responses stream into the UI token by token in real time (the same UX as a typical LLM c...
Implement a Database Connection Pool
Implement a simple database connection pool. You are given a mock database client with a function such as db.query(connection, sql) or an equivalent s...
Design an Ad Pacing System
Design an advertising pacing system for a large-scale video / streaming advertising platform. Advertisers create campaigns with budgets, flight dates ...
Design a Thread-Safe Shared Counter
Design and implement a per-key call counter: a component that tracks how many times each distinct key has been seen. The API is a single method, for e...
How to prepare for AI-assisted coding interviews?
Scenario You've been invited to a DoorDash onsite round labeled the "AI Code Craft Challenge." Per the prep kit: - You will receive starter code — an ...
Explain Modern Python Features and Ecosystem
You are interviewing for a senior Python software engineering role. The interviewer is probing the breadth and depth of your Python knowledge: not jus...
Design a multi-threaded synchronous log writer
Problem Design a log(message) component that is called from many application threads concurrently and appends each message to a single log file on dis...
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...
Find Shortest Unique Prefixes
Given a list of distinct non-empty words, return the shortest unique prefix for each word in the same order as the input. A prefix of a word is consid...
Design RAG Retrieval for Data Assets
Design the retrieval component for an internal AI coding/analytics assistant. When a user asks a data-related question, the assistant must identify th...
Fix the Password Reset Workflow
You are given a small code repository that implements a password reset flow. The repository ships broken: several bugs prevent the application from wo...
Design a deck of cards with shuffle/draw
Object-Oriented Design + Randomness: A Deck of Cards Design an in-memory model of a standard 52-card playing deck. Your design will be exercised by cl...
Find Maximum Eastbound City Visits and Parse CSV
Answer both coding questions. Question 1: Maximum eastbound city visits You are given two arrays of the same length: - cities[i]: the name of the i-th...
Design an in-memory banking system
Implement an in-memory banking system (e.g., in Java) that supports the following operations on user accounts. Assume user IDs are unique strings and ...
Implement 2048 Game Logic
Implement the core movement logic for the 2048 game. You are given an n x n integer board where 0 represents an empty cell and every nonzero value rep...