Software Engineering Fundamentals Interview Questions
Practice 603 real Software Engineering Fundamentals interview questions for 2026. Covers core coding, data structures, complexity analysis, debugging, and implementation best practices — real questions from actual interviews with detailed solutions to support focused interview preparation. This category tests the engineering basics interviewers rely on to predict on-the-job performance: correct and efficient algorithms, clean and maintainable code, complexity trade-offs, edge-case reasoning, and the ability to turn requirements into a working implementation under time pressure. Expect heavy weighting at companies like Amazon, Google, and OpenAI, where fundamentals often gate candidates before system design or product rounds. To prepare, prioritize timed problem practice that enforces clear communication, complexity justification, and test-case coverage; drill common data structures and complexity patterns until they become second nature; and rehearse coding on a whiteboard or shared editor to simulate real loop conditions.
"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 an Expected O(1) Randomized Container
Design an Expected O(1) Randomized Container Design a generic container that stores distinct elements and supports: - insert(element) -> bool: add an ...
Explain C++ and GPU Tradeoffs
The interview included several short-answer questions, all discussed in C++: 1. Explain how to reason about the output of a C++ program that uses both...
Design a shopping cart with coupons and tax
Design an object-oriented shopping cart module for an e-commerce system. Requirements: - A cart can add items and update item quantities. - The cart s...
Implement a rate limiter and a pub/sub API
This question evaluates competency in concurrency control, synchronization, API and low-level system design, and messaging system concepts by combinin...
Design employee and company classes with tests
This question evaluates object-oriented design, API modeling, and unit testing competencies by requiring an Employee and Company model, CRUD operation...
Clarify and Implement Search Filters for a Library Table
Clarify and Implement Search Filters for a Library Table An existing library-management application shows a book table that users find too long and di...
Debug Metrics Computed Before Filtering
Debug Metrics Computed Before Filtering A metrics page accepts filters and returns both matching rows and summary metrics. Users report that the rows ...
Design a banking ledger for deposits/withdrawals
This question evaluates a candidate's competency in monetary data modeling, concurrency control, idempotency, and maintaining transactional correctnes...
Explain virtual machines and concurrency basics
Topics Answer at a senior-engineer depth. Use diagrams or step-by-step reasoning as needed. 1) Virtual machines (VMs) - What is a VM and what problem ...
Explain CPU-Bound vs I/O-Bound Work
Define CPU-bound and I/O-bound workloads. Then compare how multithreading, asynchronous I/O, and multiprocessing behave for each type of workload, esp...
Fix race condition in concurrent deposit
Concurrent bank account debugging (thread safety) You are given a simple BankAccount object that is used concurrently from multiple threads. Two depos...
Explain what torch.distributed.barrier does
Question In PyTorch distributed training, what does torch.distributed.barrier() do? Follow-ups - Give an example of when you would use it. - What are ...
Compute precision/recall from a flaky top-k API
You have 10 image files. Each file has a ground-truth label indicating whether it contains a dog. You can call an API like searchDogs(k) which is inte...
Linux Host and Filesystem Fundamentals
Linux Host and Filesystem Fundamentals Clarifying Questions to Ask - Which Linux distribution and shell should be assumed? - Are privileged commands a...
Design Ordered CUDA Reduction
In CUDA, a parallel reduction can produce different results if the combination order is not fixed, especially for floating-point arithmetic where addi...
Explain and Diagnose a Segmentation Fault
Explain and Diagnose a Segmentation Fault Explain what a segmentation fault represents in a native program, how it relates to virtual-memory protectio...
Compare Stack and Heap Memory and Probe Stack Direction
Compare Stack and Heap Memory and Probe Stack Direction Explain the practical differences between automatic storage commonly implemented with a call s...
Compare C++ Pointers and References
Compare C++ Pointers and References Compare C++ pointers and references. Explain initialization, nullability, reseating, syntax, arithmetic, ownership...
Explain your database experience and debugging approach
This question evaluates a candidate's practical database engineering knowledge, concurrency debugging skills, and ability to integrate and verify AI-a...
Design an API for Pascal Triangle
Design an HTTP API that returns Pascal's triangle for a requested height. The server should return only numeric data, while the client is responsible ...