Software Engineer Software Engineering Fundamentals Interview Questions
Practice 284 real Software Engineering Fundamentals interview questions for Software Engineer roles. From companies including Amazon, Bitkernel, Apple, Google, Uber.
"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."
Explain how browser authentication works with JWTs
Explain, at a high level, how authentication typically works in a browser-based web app when using JWTs. Cover: - Where the token is stored (e.g., mem...
Format VARCHAR amounts into $ with M/B suffix
You are given a table transactions with: - id (primary key) - amount_str (VARCHAR): a numeric string representing an amount in dollars (e.g., '950', '...
Design a pizza ordering system
Design the core object-oriented model for a pizza ordering system used by a small restaurant. The system should allow customers to: - browse a menu of...
Design an object-oriented parking lot system
Design an object-oriented model for a parking lot management system. Requirements: - The parking lot has multiple levels; each level has multiple park...
Explain JS event loop and related concepts
You are interviewing for a frontend JavaScript position. Answer the following conceptual and practical questions. 1. JavaScript Event Loop, Microtasks...
How do you assess database system stability?
You are responsible for a production database (or database platform) used by multiple services. How would you determine whether the database system is...
Explain benefits of a lockfile
When running a JavaScript app using package managers like npm or yarn, what is the purpose of a dependency lockfile (e.g., package-lock.json or yarn.l...
Explain how you use AI tools in development
You’re asked about your AI experience in day-to-day software development: - What AI-assisted development tools have you used (e.g., code completion, c...
Design a meeting room reservation API
Meeting room reservation (OOD) You are designing a small in-memory meeting reservation system. Requirements - The system starts with N meeting rooms (...
Parse nested XML inside CDATA
You receive messages in XML. One element contains a CDATA section, but the CDATA text itself is another XML fragment (i.e., “XML embedded as text”). E...
Design a waitlist system with top/bottom K
Object-Oriented Design: Waitlist System Design and implement (at the class/interface level) a waitlist system that supports the following operations: ...
Find largest file in a directory using Bash
Write a Bash command (or short script) that, given a directory path, returns the largest regular file under that directory. Requirements: - Search rec...
Diagnose Return Eligibility Scoring Bugs
You are working on an e-commerce return-eligibility service. For each return request, the service computes a risk score using signals such as: - how m...
Design a multi-timer using single underlying timer
You are given a Timer class that has access to a single underlying system timer API that can only keep one active timer at a time. Underlying single-t...
Explain deadlock cases and how to prevent them
You are asked in an interview to discuss deadlocks in concurrent programming. 1) What is a deadlock? 2) What conditions must hold for a deadlock to be...
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...
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 matrix transforms and discuss eigenvalues
You are given a square matrix A (size n × n). 1. Diagonal symmetry (transpose): Transform A into its transpose (mirror across the main diagonal). Pref...
Design a Dormitory Room-Assignment System (OOD)
You are asked to design the object-oriented model for a dormitory room-assignment system. You are given a set of students and a set of rooms. Each roo...
Design employee and company classes with tests
Object-Oriented Design + Unit Testing: Employee & Company You are implementing a small in-memory model for a company and its employees. This is a deli...