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."
Compute max profit across dated stock quotes
You are given an unsorted list of price records for multiple stocks, each record as (date, symbol, price). Dates may be repeated across different symb...
Design an A/B testing platform
Design an internal A/B testing platform for a consumer product company. Product and engineering teams should be able to: - create, update, pause, and ...
Explain VPCs and private/public network connectivity
What is a VPC (Virtual Private Cloud)? Explain the difference between a private network and a public network/subnet. How do private subnets connect to...
Merge K timestamped lists with timestamp coalescing
You are given k sorted lists (or linked lists) of records. Each record has: - timestamp (integer) - values (an array of integers sorted in non-decreas...
Design ad click aggregator and file sync service
You have two system design prompts. 1) Design an ads click aggregation system Design a service that ingests ad click events at very high QPS and suppo...
Remove adjacent duplicates and handle tree input
You are asked three related coding questions. 1) Remove adjacent duplicates (repeatedly) Given a string s (lowercase English letters), repeatedly remo...
Scale a file-crawling API using async jobs
You implemented a synchronous API that lists all files under a directory (recursive crawl). Now you need to scale it. Part A — Scaling discussion (no ...
Solve sliding-window and disjoint-string-pairs tasks
Task A (Sliding Window) Given a string s, find the length of the longest contiguous substring that contains no repeated characters. - Input: a string ...
Solve Four Online Assessment Problems
Complete the following four independent coding tasks. For each task, write a function that returns the requested result. 1. Find the best value index ...
Design a scalable coffee ordering notification system
Design an online coffee ordering system. Core flow - Customers browse menus for nearby coffee stores, place orders, and pay. - Coffee stores receive o...
Optimize a dispatcher’s scheduling data structures
Algorithmic analysis / code review: Dispatcher for memory-constrained scheduling You are given a single-threaded in-memory dispatcher that reacts to t...
Implement bus route simulation features
Bus Route Simulation – Boarding, Capacity, and Priority Passes You are given a partially implemented codebase for simulating bus routes in a city. Bus...
Solve two coding assessment tasks
The online assessment contained two coding problems: 1. Maximize store revenue You are given an integer array quantity of length n, where quantity[i...
Merge two sorted arrays in-place
You are given two integer arrays sorted in non-decreasing order, and two integers m and n: - nums1 has length m + n. The first m elements of nums1 con...
Solve interval merge and string dedup problems
You are given three coding questions from a phone screen. Solve each independently. 1) Merge overlapping intervals Input: A list of intervals interval...
Compare arrays, linked lists, hash tables, trees
Answer the following computer-science fundamentals questions: 1) What are the time complexities (Big-O) of common sorting algorithms (e.g., bubble sor...
Design a Global Marketing Email Platform
Design a marketing email system for a large consumer marketplace. The business wants to run campaigns that may send 2-3 marketing emails within a 15-m...
Maximize revenue by choosing one query type
You are given a virtual warehouse that can execute queries. There are n query types, and you must choose exactly one query type to run repeatedly for ...
Decompress encoded string with nested repeats
Given an encoded string, decompress it into its expanded form. Encoding rules: - Parentheses (...) denote a group. - A repetition count is written in ...
Design a banking ledger for deposits/withdrawals
Banking/OO Design: Account Ledger Design a minimal in-memory or persistent component for a bank account system that supports: - deposit(account_id, am...