Software Engineer Interview Questions
Practice 4,657 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 Audit Logs Service
Design an Audit Logs Service Design a backend service that records audit log events for a multi-tenant SaaS platform and lets each account's users que...
Minimize Array Amplitude After Removing a Contiguous Block
Given an array of integers and an integer K, remove exactly K contiguous elements so that the amplitude of the remaining array, defined as max(remaini...
Build a Progressive Banking System
Build a Progressive Banking System The source reports progressive account, activity-ranking, expiring-transfer, and merge features but not exact retur...
Describe Something New You Learned Recently
Describe Something New You Learned Recently Describe one meaningful thing you learned during the last six months. Explain why you chose it, how you le...
Design a Text-to-Video Generation System
Design a Sora-like text-to-video generation platform. Users submit a text prompt, optional generation settings (duration, resolution, fps, seed, model...
Design a To-Do List Service (CRUD, Auth, Rate Limiting, Caching & API Versioning)
Design a to-do list service. Users sign in, create multiple named lists, and within each list create, view, update, and delete tasks. The service is a...
Design a Distributed Logging System
Design a Distributed Logging System You are asked to design a distributed logging system for a large microservices platform (think of a ride-hailing c...
Split a Message into Length-Limited Parts with Numbered Suffixes
Given a message string and a length limit, split the message into ordered parts. Each part must end with a suffix like <X/Y>, where X is the 1-based p...
Plan Eviction and Cleanup for a Production Cache
Plan Eviction and Cleanup for a Production Cache A process-local timed cache is correct for basic puts and gets, but it can still exhaust memory, reta...
Review and Debug an AI Chatbot
Review and Debug an AI Chatbot Review the design of an AI chatbot and propose improvements. Then explain how you would investigate reports of incorrec...
Design a Ride-Sharing System (Uber-style Core Platform)
Design a Ride-Sharing System (Uber-style Core Platform) Design the core backend of a ride-sharing platform like Uber. Riders open the app, see nearby ...
Remove All Adjacent Duplicate Pairs
Remove All Adjacent Duplicate Pairs Given a string s, repeatedly remove pairs of equal adjacent characters. A removal can make a new equal pair adjace...
Design a "Future Best-Sellers" Prediction and Recommendation System
Design a "Future Best-Sellers" Prediction and Recommendation System An e-commerce platform wants a new feature on its category pages. A user selects a...
Filter Repeated Robot Status Messages
Filter Repeated Robot Status Messages Implement filter_messages(events) for a robot status stream. Each event is a pair [timestamp, message]. Return, ...
Sort Matrix Diagonals By Their Values
Given an n x n matrix of lowercase letters, consider every diagonal that runs from bottom-left to top-right. There are 2n - 1 such diagonals. Assign e...
High Availability and Failover for a Primary-Replica Database
High Availability and Failover for a Primary–Replica Database Your team owns the relational database platform that backs a high-traffic transactional ...
Design a Prompt Playground
Design a Prompt Playground The source reports a full-stack Prompt Playground system-design interview covering product features, UI, architecture, and ...
Simulate a TTL Cache with LRU Eviction
Simulate a TTL Cache with LRU Eviction Implement a deterministic simulator for a cache that combines per-key expiration with a fixed-capacity least-re...
Design Sensor Data Processing With AI-Assisted Implementation
Design a system that ingests sensor data, processes it, stores it, and supports queries over the processed results. In the coding round, the candidate...
Explain C++ Inline, Segfaults, Virtual Memory, and std::string Internals
Answer a C++ systems interview covering inline functions and inline variables, segmentation faults, MMU address translation, TLB and page tables, page...