Software Engineer Software Engineering Fundamentals Interview Questions
Practice 524 real Software Engineering Fundamentals interview questions for Software Engineer roles. From companies including Amazon, Google, Bitkernel, Apple, DoorDash.
"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 a thread-safe key-value store
You are working on infrastructure for an AI platform. Inside a single process, many worker threads need to share a simple in-memory key–value store; a...
Implement tail -n for a Very Large File
Implement tail -n for a Very Large File Design and implement the core of tail -n: given a seekable file and a non-negative integer n, return the final...
Model Direct-Sold DSP Orders
Design a data model for tracking a direct-sold demand order in a demand-side advertising platform. Context: - The platform manages advertiser demand a...
Explain DB concurrency, debugging slowness, DDD and CQRS
Backend fundamentals: concurrency, performance investigation, and architecture terms Answer the following backend questions: 1. How do databases handl...
Explain Out-of-Bounds Bugs and Infinite Loops
You are given a C or C++ code snippet that behaves incorrectly. The root cause is an out-of-bounds memory access, such as reading or writing past the ...
Implement CRUD API and tests
You are given two software-engineering tasks. 1. Implement a simple REST API for a resource such as Note or Message. - Support basic CRUD operation...
Find frequent IPs from a huge file
You are given a very large log file (too large to fit in memory). Each line contains an IPv4 address (e.g., 203.0.113.7). Design an approach to answer...
Investigate High Memory Usage
You are the on-call engineer for a delivery platform. System context - Couriers use a mobile app to accept and complete deliveries. - The mobile app c...
Compare processes and threads in Linux and Python
Explain the differences between a process and a thread in Linux. Then explain how Python differs (e.g., the GIL), and when you would use Python thread...
Exception Handling in a RESTful Service with @ControllerAdvice
This question evaluates a candidate's understanding of centralized error handling in RESTful API design, specifically using framework-level cross-cutt...
Java and Object-Oriented Design Fundamentals
This question assesses mastery of software engineering fundamentals across object-oriented design, Java collections, and the Spring framework. It test...
How Would You Test a System That Counts the Leaves on a Tree?
This question evaluates a candidate's ability to design a test strategy for an ambiguous, open-ended system rather than write code. It tests skills in...
Explain what happens when opening a website
When a user types https://www.amazon.com into a browser and presses Enter, what happens end-to-end? Cover the major steps across the browser, DNS, TCP...
Design and Solve a Rotatable Jigsaw Puzzle
Design and Solve a Rotatable Jigsaw Puzzle Design the classes and a solve operation for a rectangular jigsaw puzzle. You are given all pieces, but not...
How do you review a design document?
This question evaluates proficiency in reviewing design documents, including requirements and scope, architecture and data flow, correctness and secur...
Process Sharded Login Logs
This question evaluates understanding of distributed systems, stream processing, and reliable data engineering concepts related to ingestion, ordering...
Debug a Project Assignment Codebase
This question evaluates debugging, state management, test-driven troubleshooting, data filtering correctness, and the ability to maintain a public API...
Define a one-way function and its uses
What is a one-way function (also called a one-direction function) in cryptography? Define it precisely and explain common uses in real systems (e.g., ...
Implement a Single-Node Priority Pub/Sub
Implement a simplified in-memory publish-subscribe system that runs on a single machine. The system should support users subscribing to topics with a ...
Implement a Vending Machine
Design and implement the core logic for a vending machine using object-oriented principles. The machine stores products, accepts bills, tracks the cur...