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."
Solve Rooms and Top-K Streams
You are asked to solve two independent coding problems. Problem 1: Minimum concurrent meeting rooms Given a list of meeting time intervals intervals, ...
Design a Text-to-Video Generation Service
Design a large-scale text-to-video generation service similar to a modern generative video product (e.g. a Sora-style system). A user submits a text p...
Prepare for a Frontier AI Recruiter Screen
You are interviewing for a senior or staff-level software engineering role at a frontier AI company (the original poster was screening at Anthropic). ...
Implement Cache and Count Components
You are asked to solve two independent coding problems in this session, each followed by a short discussion. This mirrors a 60-minute Amazon SDE codin...
Resolve Conflict and Challenge Project Decisions
Walk the interviewer through two behavioral stories using a structured format such as STAR (Situation, Task, Action, Result). The bar is set by Amazon...
Design Calendar Event Conflict Handling
Design the event settings and conflict-handling system for a large-scale calendar product similar to Google Calendar. Users can create, update, and de...
Design Premium Product Recommendations
Design an ML/AI-powered recommendation system for Intuit that recommends premium products, upgrades, offers, or educational content to users, with the...
Design a Distributed Rate Limiter
Design a distributed rate limiting service for a public API platform. The service sits on the request path of every API gateway and application server...
Design Ad Frequency and Order Tracking
Design two components of an ads platform. This is a two-part system-design question: Part 1 is a real-time frequency-capping service used during ad de...
Debug a GRPO training loop and explain ratios
You are given a simplified implementation of a GRPO (Group Relative Policy Optimization) training step for an RLHF-style policy model. The training is...
Design a Task Scheduler for Opaque Long-Running GPU Jobs ("Design Sora")
Design a task scheduler that runs long-running, opaque video-generation jobs at scale (the "Design Sora" prompt). Your platform lets users submit a te...
Design a Cloud DevBox Platform
Design a cloud DevBox platform: a service that gives developers disposable or persistent remote development machines, accessible through a browser, SS...
Design a Parallel Image Processor
Design an image-processing component that applies one or more filters to an image and produces a new image. An image is a 2D grid of pixels (with one ...
Solve Three Array and Matrix Path Problems
You are given three independent coding tasks. For each task, design an algorithm, implement it, and analyze its time and space complexity. 1. Find the...
Design Cloud File Storage
Design a cloud file storage service similar to Google Drive. Users store and retrieve files through web, desktop, and mobile clients, organize them in...
Design GPU inference request batching
Design a system that serves online model-inference requests on GPUs. Requests arrive one at a time from clients, but GPU throughput is far higher when...
Implement a Banking System
Design and implement an in-memory banking system. All operations are processed in non-decreasing timestamp order. Account identifiers are strings. Mon...
Describe Delivering Under a Tight Deadline
Tell me about a time when you had to deliver a project under a tight deadline. Walk me through the trade-offs you made, how you protected quality desp...
Enumerate 4x4 Tic-Tac-Toe Games
You are given an empty $4 \times 4$ board. Two players, X and O, alternate turns with X moving first. A player wins as soon as they place three of the...
Implement a Distributed Rate Limiter
Implement a simple rate limiter library that can run across multiple application servers. The rate limiter should support a sliding time window policy...