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."
Minimize Operations to Balance Shipments
A shop has n item types, where quantity[i] is the positive integer quantity of the i-th item type. The item types must be shipped in two non-empty con...
Find Shortest Queue with Few Calls
You are given a list of queues of integers. For each queue, the only available operations are isEmpty() and poll(), where poll() removes and returns t...
Implement a Cloud Storage Service
Implement an in-memory cloud storage system. Build the class incrementally; later levels must preserve all behavior from earlier levels. File names ar...
Implement SQL Table and DNA Ordering
Two independent coding exercises were asked. Solve both. Problem A: CSV-backed in-memory table Build a tiny in-memory relational table initialized fro...
How to answer Staff (L6) behavioral interview questions
Staff / L6 “” org-level impact * * - Scope & Impact/// - StakeholdersEM/PM/Infra/Product/ Staff - Options & Trade-offs 2–3 - Influence without Aut...
Design a malicious-URL checking service using an isMalicious API
Design a backend service that determines whether a given URL is malicious. You have access to an external dependency: - isMalicious(url) -> bool (blac...
Evaluate Symbol Expressions
You are given a map from symbol names to arithmetic expressions. Each expression may contain integer constants, other symbol names, parentheses, and t...
Explain C++ default constructor generation rules
You are given a C++ class type T. 1. When will the compiler implicitly declare a default constructor for T? 2. When will the implicitly-declared defau...
Design a RAG system for vehicle documents
Design a Retrieval-Augmented Generation (RAG) architecture to power a Q&A chatbot over vehicle documentation. Document types & characteristics - Sourc...
Compute max reachable cells per threshold
You are given: - An m x n integer matrix terrain. - An integer array limits of length k. For each query value L = limits[i], you start at the top-left...
Explain normalization, regularization, CTR, imbalance handling
You are interviewing for an applied ML role. Answer the following fundamentals clearly and concretely (you may use equations and practical examples): ...
Design a hybrid-cloud GPU allocation service
System Design: Hybrid-Cloud GPU Resource Allocation & Job Management Design a service that allocates and manages GPU resources for ML training jobs in...
Solve 12 coding interview problems
Below are multiple independent coding problems. --- Problem 1: Reduce an integer to 0 with \(\pm 2^i\) You are given a positive integer \(n\). In one ...
Process pod logs with global increments and pop-min
You are given an event log for a system of “pods.” Each event is a pair [status, value]: - status == 1: Add a new pod with initial load = value. - sta...
Remove nodes with a given value
Problem You are given the head of a singly linked list and an integer target. Remove all nodes whose value equals target, and return the (possibly new...
Compute org height and minimal CEO promotions
You are given an organization chart with n employees labeled 1..n. Employee 1 is the CEO (root). The reporting relationships are given as two integer ...
Answer project and leadership behavioral questions
Behavioral Questions (project + leadership) Prepare structured answers for the following prompts: 1. Proudest project: Describe a project you’re most ...
Maximize correct guesses in a hat line puzzle
Problem (Hat Guessing Strategy) There are N people standing in a line. Each person wears a hat that is either Red or Blue. - Person i can see the hats...
Describe a challenging recent project
Behavioral Tell me about a challenging and interesting project you worked on recently. Follow-ups - What were the hardest problems you encountered? - ...
Design Queue And Taxi Matching Services
Answer both independent system design prompts. For each one, clarify requirements, propose APIs, describe core data models, explain the architecture, ...