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 scalable search service with sharding
Technical Design: Search + Sharding Trade-offs Design a search service that lets users query documents/products with keywords. Functional requirements...
Design a temporary email service
Design a Disposable Email Service with Auto-Expiring Addresses Design a receive-only disposable email service (e.g., 10‑minute inboxes) that issues au...
Design a bidirectional data sync dashboard
Design a bidirectional data synchronization platform and an internal dashboard. Scenario Your company integrates with multiple cloud providers (e.g., ...
Generate Account Email Notifications
You are building an email notification scheduler for user accounts. You are given: 1. A list of user accounts. Each account has: - account_id - ...
Find possible robot positions
You are given a 2D grid where '.' represents an open cell and '#' represents a wall. A hidden robot is standing on one open cell. The robot's sensor r...
Design a GPU inference API
Design a scalable, GPU-backed inference API that serves multiple ML models — including large autoregressive models such as LLMs — to internal product ...
Find Maximum Island Perimeter
You are given an m x n binary grid where 1 represents land and 0 represents water. An island is a group of land cells connected vertically or horizont...
Design a scalable notification system
Problem Design a notification system for a company at Airbnb-like scale that can send notifications to different user types (e.g., customers/guests, h...
Count All-One Square Submatrices
Given an n x n binary matrix, count how many square submatrices contain only 1s. A square submatrix can have any side length from 1 to n. Example: `te...
Solve Tree Diameter and Palindromic Counts
You will be given two independent coding problems. For each problem, explain your approach clearly and analyze both time and space complexity. Problem...
Design Spreadsheet Formula Cells
Design an in-memory spreadsheet that supports assigning either literal integer values or formulas to cells. Cells are identified by names such as A1, ...
Implement Checksums and Feature Rollout Evaluation
Complete the following two coding tasks in a 90-minute online assessment. An AI coding assistant may be available, but the submitted code must pass th...
Design a dynamic leaderboard with rank queries
Problem: Dynamic Leaderboard You are asked to implement a leaderboard that maintains scores for a set of elements (e.g., players/items). Scores can ch...
Support Dynamic Range Sums
Implement a data structure over an integer array nums. Part 1: If the array never changes, support sumRange(left, right) that returns the sum of eleme...
Find largest connected group of overlapping intervals
You are given n people, where person i works during an inclusive time interval [start_i, end_i]. Define a communication graph: - Each person is a node...
Implement a versioned hash map with snapshot
VersionedHashMap (time-travel key-value store) Design and implement a data structure VersionedHashMap<K, V> backed by a hash map that supports retriev...
Design a superhero incident dispatch system
System Design: Superhero Dispatch (Uber-like) System Design a system that dispatches superheroes to real-world incidents (e.g., fires, robberies, mons...
Deep-dive a project and show ownership
You will be asked to do a deep dive on one or two past projects. The interviewer(s) may probe heavily on technical details and leadership behaviors. P...
Answer leadership scenarios about influence and integrity
Answer the following behavioral questions with concrete examples (use STAR: Situation, Task, Action, Result): 1. Describe a time you convinced others ...
Define a one-way function and its uses
What is a one-way function (also called a one-direction function) in cryptography? Define it precisely and explain common uses in real systems (e.g., ...