Software Engineer Interview Questions
Practice 5,054 real software engineer interview questions for 2026. Covers top employers like Google, Amazon, OpenAI, and Uber — real questions from actual onsites with detailed solutions — and is built for focused interview preparation. This collection emphasizes coding and algorithms first, then system design, performance, and role-specific domains so you can train the exact skills interviewers test. What’s distinctive: coding rounds still dominate at every company, Google often emphasizes algorithms and distributed-systems thinking, Amazon commonly probes scalable-services design and operational tradeoffs, OpenAI leans toward ML systems, model deployment and inference-scaling problems, and Uber typically asks real-time routing, geospatial and consistency challenges. Expect live coding, pair-programming, and whiteboard/system-design sketches. To prepare efficiently, drill medium-to-hard algorithm problems with time limits, practice end-to-end system design sketches focused on capacity and reliability, and rehearse concise behavioral stories that show ownership and impact.
"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 Event-Driven CPU Overheat Controller
Design an Event-Driven CPU Overheat Controller Design an OverheatPreventionController that simulates multiple processor cores without physical sensors...
Count Rectangle Coverage on a Grid
Count Rectangle Coverage on a Grid You are given an n x n grid initially filled with zeroes and a list of inclusive rectangular updates. Each rectangl...
Design a News Aggregation System (Google News-style)
Design a large-scale news aggregation service similar to Google News. The system continuously discovers and crawls news articles from tens of thousand...
Design a Concurrent Restaurant Waitlist and Seating System
Design a Concurrent Restaurant Waitlist and Seating System Design a restaurant system with a configurable set of tables and a FIFO waitlist of parties...
Merge Exact-Word Highlights and Rank Their Citations
Highlight Exact Source Phrases and Attach Citations You are given a text string and an indexed list of source phrases. All input tokens are alphanumer...
Debug Watch List Movie Operations
You are given a full-stack Movie DB application. Users can log in, create, update, and delete watch lists, and add or remove movies from a watch list....
Deduplicate and Order Batch and Streaming Logs
Deduplicate and Order Batch and Streaming Logs A log is (timestamp, message), where timestamp is an integer and message is compared exactly. Input ord...
Design First-Fit and Best-Fit Memory Allocation
Design the core of a heap allocator over one contiguous managed region. Blocks have an address, size, and free/allocated state. Allocation requests sp...
Design a Scalable and Safe Agentic System
Design a Scalable and Safe Agentic System Design a service that accepts a user goal, lets an AI agent plan and invoke approved tools, and returns a re...
Design a Concurrent Image Processing Service
Design a Concurrent Image Processing Service Design an image-processing service in two stages. First, support one processor safely. Then scale to mult...
Design a Low-Latency Metrics and Alerting Platform
Design a Low-Latency Metrics and Alerting Platform Design a multi-tenant platform that collects host and application metrics, stores time-series data,...
Design Snapshot Set Iteration and Clarify Durable Writes
Work through a snapshot-set iterator and then explain how you would clarify a separate durable-writer exercise whose detailed contract has not been pr...
Prepare for Backend Parsing, API Integration, AI Coding, and Bug Fixing Rounds
Prepare for backend parsing, extensible class design, API integration, AI-assisted coding, bug fixing, and a hiring-manager round. `hint Hint 1 Start ...
Minimize Direction Violations in a Directed Road Network
Minimize Direction Violations in a Directed Road Network There are n nodes numbered from 0 through n - 1. Every input edge [u, v] has an original dire...
Reorder a String by Alternating Its Left and Right Ends
Reorder a String by Alternating Its Left and Right Ends Given a string text, construct a new string by taking characters in this order: 1. first chara...
Last Truck to Leave a One-Dimensional Lane
Last Truck to Leave a One-Dimensional Lane Implement last_exit_time(lane_length, positions, velocities). Distinct trucks start at integer positions st...
Find Paths Across a Weighted Binary Grid
Find Paths Across a Weighted Binary Grid Given an m by n binary grid, a cell with value 1 is traversable and 0 is blocked. Movement is allowed up, dow...
Design Chat Deletion Semantics Under Concurrent Sends
Design Chat Deletion Semantics Under Concurrent Sends Design the backend of a chat application that supports creating threads, sending messages, readi...
Recover from a Missed Deadline
Recover from a Missed Deadline Prompt Tell me about a deadline you missed or were on course to miss. Explain how the commitment was made, when you rec...
Design a News Subscription Processing Engine
Design a news subscription processing engine with four core capabilities: receive a news item, add a subscription, remove a subscription, and publish ...