Software Engineer Interview Questions
Practice 4,429 real software engineer interview questions for 2026. Covers top employers like Google, Amazon, OpenAI, and Uber — real questions from actual onsites with detailed solutions — and is built for focused interview preparation. This collection emphasizes coding and algorithms first, then system design, performance, and role-specific domains so you can train the exact skills interviewers test. What’s distinctive: coding rounds still dominate at every company, Google often emphasizes algorithms and distributed-systems thinking, Amazon commonly probes scalable-services design and operational tradeoffs, OpenAI leans toward ML systems, model deployment and inference-scaling problems, and Uber typically asks real-time routing, geospatial and consistency challenges. Expect live coding, pair-programming, and whiteboard/system-design sketches. To prepare efficiently, drill medium-to-hard algorithm problems with time limits, practice end-to-end system design sketches focused on capacity and reliability, and rehearse concise behavioral stories that show ownership and impact.
"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."
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"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."
Discuss Python mutability, copying, and GIL
In Python, explain the differences between mutable and immutable objects and illustrate how they affect function arguments and container behavior. Des...
Design scenario-based speaking feature
System Design: Scenario-Based Speaking Practice for a Multilingual Learning App Goal Design a scenario-based speaking practice feature where users sel...
Design server allocation for multi-type nodes
Design a service to manage a large pool (about 100, 000) of server nodes. Each node can satisfy multiple instance types; clients call getServer(reqNum...
Introduce yourself and show mission alignment
Behavioral & Leadership: Self-Intro and API/Collaboration Scenarios Context You are interviewing for an ML Engineer role at a consumer fintech startup...
Handle invalid input at system level
Design: Validation and Error Handling for a Top-K Frequency API Context You are designing a REST endpoint that computes the top-K most frequent values...
Solve array modulo and parentheses tasks
Implement two tasks: 1) Count subarrays by modulo remainder - Input: integer array nums (length n), integers K (1 ≤ K ≤ 10^ 4) and R (0 ≤ R < K). - Ou...
Design a Multi-Channel Message Queue
Design a Message Queue with Multi-Channel Messages and Channel-Based Subscriptions Context You are asked to design a message-queue data structure wher...
Detect duplicate files efficiently
You are given access to a very large file system containing file paths and read access to file contents. Design an algorithm to identify groups of fil...
Describe past projects and impact
Behavioral: Deep Dive Into Past Projects (Software Engineer, Technical Screen) Provide 1–2 major software engineering projects from your recent experi...
Implement LRU, Extend to LFU, Analyze Complexity
Implement an in-memory Least Recently Used (LRU) cache with capacity N that supports get(key) -> value and put(key, value). Achieve O( 1) average time...
Design distributed transactions protocol
System Design: Distributed Transactions Across Multiple Services Context You must design a distributed transactions protocol to coordinate updates acr...
Design an extensible ticketing system
System Design: Extensible EventTicketSystem Context Design a ticketing platform that sells tickets for concerts, movies, and sports. The system must s...
Identify impactful blog content pillars
Content Pillars for a Developer-Facing Software Product Blog (Beyond Performance) Context You are planning the editorial strategy for a developer-focu...
Find >n/3 elements in sorted array
Question Given a sorted (non-decreasing) integer array A of length n, return all distinct values that occur strictly more than n/3 times. Design an al...
Design tables from metrics
Data Modeling Design Task: Short‑Video Social App Analytics You are designing an analytics data model for a short‑video social application. The app su...
Model and measure trading transaction costs
Modeling and Incorporating Transaction Costs in an Event-Driven Trading Strategy Context You are designing an event-driven trading strategy that react...
Implement a Simulated Memory Allocator
Implement a simulated memory allocator that supports allocate(size) and free(ptr) operations analogous to malloc and free. Treat memory as a contiguou...
Define developer-centric usability metrics
Usability and Product Metrics Beyond Latency and Accuracy Context: In a technical screen focused on analytics and experimentation, propose how you wou...
Implement compile-time function type verification
Implement a C++20 compile-time utility to verify whether a callable matches a target function type. Requirements: create a primary template is_callabl...
Find substring where all chars appear at least k
You are given a string s and an integer k (1 ≤ k ≤ |s|). Return the length of the longest substring in which every distinct character occurs at least ...