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 Ride-Hailing Platform
Design a large-scale ride-hailing platform similar to a taxi-booking app. The system should allow riders to request trips, match them with nearby driv...
Design a pipeline orchestration system on Kubernetes
Design a pipeline/workflow orchestration system (similar to a DAG-based scheduler) that runs workloads on Kubernetes. Functional requirements - Users ...
Design favorites and social game recommendations
Problem Design a backend system for a gaming app that supports: 1. Favorites ("Fav"): users can favorite/unfavorite games and view their favorites lis...
Assign tasks to workers with types and accounts
You are implementing a task scheduler. There are W workers (IDs 0..W-1) and N tasks (IDs 0..N-1). Each task i arrives at time arrival[i] (non-decreasi...
Boolean Expression Tree with Leaf Flips
Boolean Expression Tree with Leaf Flips You are given a boolean expression represented as a tree. - Each leaf node holds a boolean value: true or fals...
Design an online auction system
Design an online auction system (eBay-style). Requirements: - Users create auctions with start/end time and starting price. - Users place bids; system...
Design concurrent range-aware file caching client
System Design: High-throughput Client-side Ranged-read File Cache You are asked to design and specify a client-side cache that accelerates ranged read...
Design a game recommendation modeling approach
Scenario You are building a personalized game recommender for a consumer app/store. The goal is to recommend a ranked list of games to each user to in...
Design an image-to-multilanguage translator
Scenario Design a service that lets users upload an image containing text (e.g., a menu, screenshot, street sign), and returns the same image with the...
Normalize a file path
Given an absolute Unix-style file path as a string, return its canonical normalized form. Rules: - The input always starts with /. - A single . means ...
Solve Sliding Window and Grid Search
In a Software Engineer phone screen, the candidate was asked to solve two coding problems. 1. Longest substring with at most k distinct characters ...
Solve Maze and Suffix Problems
Solve the following two coding problems. Problem A: Find the shortest path through a maze with keys and doors You are given a 2D grid representing a m...
Design an On-Demand Delivery Platform
Design an on-demand local delivery marketplace for restaurants or grocery stores. The platform should support customers browsing merchants, building s...
Design load balancing, caching, and idempotent APIs
You are designing a backend service that will be deployed across multiple instances behind a load balancer. Answer the following: 1) Load balancing - ...
Find Feature Activation Order
You are building a feature-flag system for a product. There are n features labeled 0 to n - 1. Each dependency pair [a, b] means feature a depends on ...
Implement an in-memory file system
Implement an in-memory file system supporting basic directory and file operations. You must support the following methods (names are illustrative; any...
Design and implement an LRU cache
Problem Design and implement an LRU (Least Recently Used) Cache that supports the following operations in O(1) average time: - get(key) → returns the ...
Design multi-core service startup scheduler
Service Startup Scheduler on a Host with M CPU Cores Context You are given a directed acyclic graph (DAG) of services where an edge u → v means servic...
Find Shortest Square-Sum Path
Given a positive integer n, find one shortest path from 0 to n where each step adds a perfect square number. Equivalently, return a shortest sequence ...
Explain Kubernetes autoscaling and traffic routing
In Kubernetes: 1) How does autoscaling work (pod and node scaling)? 2) How is traffic routed from outside the cluster to the right Pods? 3) What are t...