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 Multi-Rule Rate Limiter
Design and reason about a rate limiter that begins with one rule and evolves to support multiple rules, concurrent requests, handler failures, and def...
Explain Lazy Loading and Frontend Code Splitting
Explain Lazy Loading and Frontend Code Splitting A single-page application has grown until its initial JavaScript bundle delays interactivity. Explain...
Find a Local Minimum in One and Two Dimensions
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Reason About Remote Browser Isolation and Secure Media Delivery
Reason About Remote Browser Isolation and Secure Media Delivery Discuss the security and delivery trade-offs among remote browser isolation, Zero Trus...
Design a Multi-Dimensional Job Rate Limiter
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Design Extensible Interview Coding Systems
Review a broad software engineering interview loop covering object-oriented delivery APIs, rule engines, article voting systems, and a news aggregator...
Build a Custom CompletableFuture: Async Primitive and Parallel Array Processing
You are asked to design and implement, from scratch, a simplified asynchronous "future / promise" abstraction in the spirit of Java's CompletableFutur...
Design Calendar Event CRUD with Unit Tests
Design and implement a small calendar application that supports creating, editing, and deleting events. The interviewer expects unit tests and clean s...
Design Tree Operations with DFS and BFS
Design an object-oriented tree class with several operations that require DFS and BFS traversal. Explain the node model, traversal APIs, and how you w...
Debug a Stale Insurance Eligibility Status
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Find the Most Frequent IP Addresses in a File Too Large for Memory
Design an exact, bounded-memory method for finding the most frequent IP addresses in a file far larger than RAM. Analyze memory and disk-I/O trade-off...
Repair and Extend a Transaction Reward Processor
Repair and Extend a Transaction Reward Processor An existing layered web service has failing unit tests. Its transaction-processing path must read a t...
Use find, ps, top, and kill Safely on Linux
Use find, ps, top, and kill Safely on Linux You are diagnosing a Linux host where an application is consuming unexpected resources and may need to be ...
Design a Real-Time Top-K Ranking System
Design an object-oriented, real-time Top-K ranking system. The system continuously receives score updates for a large set of entities — for example us...
Implement a Stepped Iterator
Design an iterator over a sequence with hasNext() and next(), then add a positive integer step. For step s, each call to next() advances by s input el...
Add Sliding-Window Get and Put Activity Metrics to a Key-Value Store
Add Sliding-Window Get and Put Activity Metrics to a Key-Value Store Extend an in-memory key-value store with averageGet(window) and averagePut(window...
Implement a Simple Memory Allocator
Design and implement a simplified memory allocator exposing malloc(size) and free(ptr) over a single fixed-size heap (a contiguous byte array). The al...
Design a Testable 2048 Game Engine
Design a Testable 2048 Game Engine Design the object model and core operations for a 2048 game. The engine must create a game, return the current boar...
Implement a Time-Aware Task Management System
Implement a Time-Aware Task Management System Implement a task-management class. All priority and quota values are nonnegative integers. Timestamps an...
Reason About Indexes, Kafka, and Database Locking
Reason About Indexes, Kafka, and Database Locking Answer the three backend fundamentals sections below. For each one, connect the mechanism to a concr...