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 distributed web crawler
System Design: Distributed Web Crawler (1,000 Heterogeneous Workers) Context You are asked to design a production-grade web crawler that begins from a...
Filter hierarchical paths after deletions
Given two arrays: ( 1) paths — slash-delimited hierarchical strings such as "California", "California/San Francisco", "California/San Francisco/7th St...
Design an e-commerce recommendation system
Design an Amazon-Scale E‑Commerce Product Recommendation System Context You are designing a large-scale recommendation system that powers multiple use...
Explain your memo, culture fit, and level justification
Behavioral Memo Walkthrough (Netflix HR Screen — Software Engineer) You are in the recruiter/HR screen for a Software Engineer role at Netflix that yo...
Simulate turn-based monster team battle
Design an object-oriented model and implement the core battle logic for a turn-based fight between two teams of monsters. The system should simulate t...
Solve Three Algorithm Variants
You are given three independent coding problems. For each one, describe and implement an efficient solution. 1. Generate queue arrangements - You a...
Design ads frequency capping service
Design an Ads Frequency Capping Service Context You are designing a service that ensures a user does not see the same ad creative or campaign more tha...
Design a payment system
Design a payment system for an online commerce platform. The system should support: - Creating a payment order for a purchase - Authorizing and captur...
Compute meeting rooms and evaluate RPN
You are given two independent coding tasks. Task 1: Minimum number of meeting rooms Given a list of meeting time intervals intervals, where each inter...
4.1 Design a Live Streaming Platform
This is a classic system design question that tests your ability to handle real-time data at massive scale. Live streaming sits at the intersection of...
Find Earliest Full Connectivity Timestamp
You are given: - A list of all user IDs in a ride-sharing system. - A chronological text log of ride-sharing events. Each relevant event contains a ti...
Minimize travel cost with two cities
You are scheduling candidates to attend an onsite interview. Each candidate i can fly to New York for cost c1[i] or to San Francisco for cost c2[i]. C...
Find all cells reachable by downhill flow
Problem You are given an m x n grid heights, where heights[r][c] is the elevation of cell (r, c). A drop of water is placed at a starting cell start =...
Remove Target Values from a Linked List
Given the head of a singly linked list and an integer target, remove every node whose value equals target and return the new head of the list. The tar...
How do you handle conflicting interviewer hints?
In a technical interview, you are solving a problem and have a clear approach in mind. The interviewer offers a hint that appears to push you toward a...
Find Kth Smallest in BST
You are given the root of a binary search tree and an integer k. Return the value of the node that would appear in the kth position if all node values...
Design an ad click aggregation service
Design a backend service that ingests ad impression and click events and provides aggregated metrics. Requirements: - Ingest a high-volume stream of e...
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...
Serialize Expression Tree Minimizing Parentheses
Given a binary expression syntax tree, serialize it into an infix string using the minimum number of parentheses required to preserve the tree's evalu...
Design an online chess platform
Design an online chess platform. Requirements: - User matchmaking (ranked/unranked). - Real-time gameplay with low latency moves. - Enforce game rules...