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."
Generate all strings by expanding wildcards
Problem Given a string s consisting only of characters '0', '1', and '', replace every '' with either '0' or '1' and return all possible resulting bin...
Design a Netflix-like video platform
Scenario Design a Netflix-like platform that supports: - Search for videos (by title, tags, people, etc.) - Stream videos to web/mobile/TV clients - U...
Implement plurality and majority voting
You are given an array votes of length n, where each element is a candidate identifier (string or integer). Implement two voting systems: 1) Plurality...
Compute shortest delivery route with dangerous stops
Delivery Route Planning With Dangerous Stops You are given delivery stops (nodes) and a set of routes. Each route is a list of stops, and you can trav...
Implement memcpy with misaligned addresses
Implement a C-style memcpy that correctly handles misaligned source/destination addresses. Task Write a function: `c void my_memcpy(void dst, const vo...
Explain Swift memory, value semantics, and GCD
Answer the following Swift/iOS fundamentals questions. A) GCD execution order + threads Assume the current thread is the main thread. Snippet 1 What i...
Design highly available blob storage service
Design a large-scale, highly available blob storage service similar to Amazon S3. The service should allow clients to store, retrieve, and delete arbi...
Explain storing files to disk with concurrency
You are working on the backend of a server that receives file uploads (for example, images or documents) from clients. You need to design and explain ...
Design bookstore and chat messaging systems
You are given two independent system-design problems. --- Question A — Design an Online Bookstore Backend Design the backend for a large-scale online ...
Design a subscription email scheduler with changes and renewals
Implement an email notification scheduler for subscription accounts. Inputs: - send_schedule: a mapping whose keys include: • "start": label to send...
Define and compare smart pointers
What is a smart pointer? How do smart pointers manage ownership and lifetimes compared with raw pointers? Describe common types (unique, shared, weak)...
Design a customer LTV prediction system
System Design: End-to-End ML for Customer Lifetime Value (LTV) Context You are designing an end-to-end machine learning system to estimate customer li...
Tell about a past project and impact
Tell about a past project and impact Behavioral: Past Project Deep Dive You are in a Software Engineer onsite interview. Share a past project you led ...
Implement Longest-Match Text Replacement
You are given a text string and a dictionary of replacement entries. Each dictionary entry has the form token:id, where token is a string pattern and ...
How do you decide with limited information?
Behavioral Question Describe a time you had to make an important decision with incomplete, ambiguous, or conflicting information. Include: - What deci...
Count Valid Infection Orders
You are given an integer n representing houses arranged in a line and indexed from 0 to n - 1, and a sorted array infected containing the indices of h...
Parse Query Parameters Into a Map
Implement a function that parses the query portion of a GET URL and returns a map from query keys to parsed values. Input is a string that may start w...
Explain Core CS and Database Concepts
The interview included a fundamentals discussion covering topics like: - Explain common data structures and when you would choose arrays, linked lists...
Explain Common Machine Learning Tradeoffs
The interview included a rapid-fire machine learning theory round. Be prepared to answer questions such as: - What are overfitting and underfitting? H...
Implement consistent hashing ring
Implement consistent hashing ring Implement consistent hashing for routing keys to servers. Provide APIs addNode(nodeId, weight), removeNode(nodeId), ...