Software Engineer Interview Questions
Practice 4,360 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."
Find minimum covering substring
Given two strings s and t, return the shortest contiguous substring of s that contains every character of t with at least the same multiplicities. If ...
Check balanced parentheses with multiple bracket types
Given a string containing only parentheses '()', determine whether it is balanced. Follow-up: extend the solution to also support '[]' and '{}' with c...
Merge customers and preserve history
Question Implement mergeCustomers(String oldId, String newId) for a payments/ledger platform. The call absorbs oldId into the survivor newId while pre...
Design distributed word count without MapReduce
System Design: Distributed Word Frequency Counting (No MapReduce) Context You need to design a distributed system that computes word frequencies over ...
Schedule dependent services with layered startup
You are given N services and dependency pairs (u -> v) meaning u must start before v. 1) Produce a valid startup order if one exists; otherwise detect...
Implement Binary Search in C++
From scratch in C++, implement binary search over a sorted array to locate a target value. Provide a correct iterative implementation, handle not-foun...
Explain data structure fundamentals
Explain how a hash map works internally: hashing, collision resolution strategies (separate chaining vs. open addressing), load factor, and resizing. ...
Design an elevator control system
Elevator Control System Design (N floors, M elevators) Context You are designing a multi-elevator control system for a building with N floors (1..N) a...
Describe your operations experience and impact
Operations Experience (Behavioral & Leadership — Technical Screen) Provide a concise but concrete overview of your production operations experience as...
Design a minimal ChatGPT with presets
System Design: Minimal ChatGPT-like Service With Reusable Presets Context Design a multi-tenant conversational AI service that supports reusable prese...
Explain potential reason for PIP risk
Behavioral Prompt: Self‑Assessment, Early Signals, and Risk Mitigation Context You are interviewing for a Software Engineer role. Imagine you accept a...
Explain career motivations and choices
Behavioral Fit Prompts for a Software Engineer (Technical Screen) Context: You are interviewing for a Software Engineer role in the finance industry d...
Solve string dictionary and tree ordering
Part A — One-edit dictionary: Build a data structure supporting build(words: List[str]) and search(query: str) -> bool that returns true if and only i...
Design locker allocation service
Design a Best-Fit Locker Assignment Component Context You are designing the locker-assignment component for a Locker OS used at physical locker banks ...
Implement expression expansion to plus-only form
Given a string expression consisting only of lowercase letters (variables), '+', '*', '(', and ')', return an equivalent expression that uses only '+'...
Solve minimum rate and subset sum
1) Minimum rate to finish vaults within a deadline: You are given an array vaults of positive integers representing the amount in each vault along a r...
Compute waits and find distance-k node pairs
Part 1 — Array next-higher wait: Given an integer array A where A[i] is the measurement for day i (0-indexed), return an array W of the same length su...
Explain database transactions and ACID
Database Transactions and ACID under Concurrency Prompt You are working with a relational database that supports transactions and multiple isolation l...
Compare GCP vs AWS and testing strategy
Public Cloud Building Blocks, Compute Choice, and Testing Strategy Context Assume you are designing a new stateless HTTP microservice that exposes RES...
Build an emoji blaster animation on iOS
iOS "Blaster" App: Press-and-Hold Emoji Projectiles Problem Build a minimal iOS app with a button fixed at the bottom. While the user presses and hold...