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 an AI playground editor
Design a full-stack AI playground web application similar to a chat product, but with one document-like component that interleaves user prompts and mo...
Model data for an ads platform
Design a data model (logical schema) for an advertising platform. Include core entities such as: - Business/account (advertiser) - Campaign and budget...
Implement a Resizable Deque
Implement a double-ended queue (deque) data structure backed by a circular array. Your deque should support insertion and removal from both ends and s...
Review a Web Application Architecture
You are given a high-level architecture diagram for a web application: Client/Web App -> DNS -> Load Balancer -> Application Service -> Database The a...
Design A Scalable Web Crawler
Design a scalable web crawler that discovers, fetches, parses, and stores web pages for downstream use such as search indexing or content analysis. Yo...
Design Hebbia Chat for SEC Filings
Design Hebbia Chat, a chat interface that lets users ask questions about SEC filings and get grounded, cited answers. The system should be fast, durab...
Find Top Errors in Time Window
Implement a function that analyzes request-response logs stored as JSON records. Each record contains a timestamp, a response status, and optionally a...
Design Sliding-Window Average Tracker
Design a class that tracks records in a sliding time window. Implement the following API: - init(time_window): initialize the object with a window siz...
Design delivery driver payment system
Design a delivery-driver payment system Design and implement an in-memory, object-oriented service that tracks delivery-driver work and computes payro...
Design CSV upload endpoint with GPT classification
You are building a backend service that needs to process two CSV files and then call an external GPT-like API for classification. Requirements 1. HTTP...
Implement and derive backprop from scratch
Tiny Neural Network From First Principles: Binary Classification Implement and analyze a minimal neural network for binary classification with a singl...
Calculate charge with a single price override
You are billing a customer based on usage intervals and a single temporary price override. Definitions - A usage record is an interval [start, end) wh...
Implement retrieval and evaluation for a simple RAG
Task You are given a small “toy RAG” notebook setup with helper utilities. You have a corpus of text passages stored in a pandas DataFrame docs_df wit...
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...
Design a Twitter-like microblogging service
Design a Twitter-like microblogging system. You can describe it verbally and with structured notes. Requirements: - Users can post short messages. - U...
Implement lossless dictionary encoding and decoding
Dictionary encoding is a lossless compression technique for a list of tokens. You are given an input string consisting of words separated by commas, e...
Update a Neuron Grid
You are given an m x n integer matrix neurons. - A cell is a firing neuron if its value is 0. - A cell is a non-firing neuron if its value is greater ...
Solve sliding window, heap, DP, in-place tasks
You are given several LeetCode-style coding tasks. Implement each with the stated time/space goals and handle edge cases. 1) Sliding Window: longest s...
Design a Scalable Likes System
Design a scalable likes service for a large consumer application. Users can like and unlike an item. The system must support these functional requirem...
Check Meeting Attendance With Breaks
You are given a list of appointment intervals for a single day and a mandatory break time between any two consecutive appointments. Each interval is r...