Software Engineer Interview Questions
Practice 5,054 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."
"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."
Implement A Prioritized Task Scheduler With Parent Dependencies
Implement a task scheduler. Each task has an id, due date, create time, high-priority flag, assignee, completion status, description, and optionally a...
Minimize Replacements So Equal Product Values Are Contiguous
Minimize Replacements So Equal Product Values Are Contiguous You are given the quality value of each product in a line. In one operation, choose two d...
Design Retrieval-Augmented Answers from a Document Vault
Design a service that accepts a user's prompt, searches a large document vault, and returns a grounded answer with citations to relevant source passag...
Design the GPU Job Scheduler for a Text-to-Video Generation Service
This system design question evaluates a candidate's ability to design a resource-scheduling layer for scarce, expensive compute under sustained overlo...
Implement Deterministic Merkle Hashing for a Repository
Implement Deterministic Merkle Hashing for a Repository You are given a repository abstraction with operations to identify files and directories, read...
Design a Rule Evaluation Engine for Spending Policy Violations
Design an extensible rule-evaluation engine for a corporate spending product. Employees submit expenses, and managers choose policies that flag expens...
Design a Tunable Recurring-Transaction Detector
Design a Tunable Recurring-Transaction Detector You receive a file of transactions and need to identify likely recurring payments such as subscription...
Deduplicate and Order Batch and Streaming Logs
Deduplicate and Order Batch and Streaming Logs Each log entry is a pair (timestamp, message). Two entries are duplicates when their message strings ar...
Design a Robust Feature Flag Evaluation Engine
You are given feature definitions and user records as JSON. Each feature flag has a key, an enabled switch, a default Boolean, and an ordered list of ...
Implement Generalized Tic-Tac-Toe
Implement Generalized Tic-Tac-Toe Implement a TicTacToe class for two players on an m by n board with a configurable winning length k. `text TicTacToe...
Find the Minimum Absolute Difference
Find the Minimum Absolute Difference Implement minimum_absolute_difference(values). Given at least two integers, return the smallest absolute differen...
Solve a Set of Probability and Quantitative Reasoning Problems
Solve the following quantitative reasoning problems. Show enough work to make each result auditable, state any interpretation you need, and keep exact...
Implement a Removable Nested-List Iterator
Implement a Removable Nested-List Iterator Implement an iterator over a mutable array of integer arrays. Traversal goes left to right within each inne...
Clarify and Design Social-Graph Milestones
Clarify and Design Social-Graph Milestones An interview exercise progresses through a social graph with snapshots, a milestone for retrieving follower...
Count Legal Tic-Tac-Toe Games from the Empty Board
Count Legal Tic-Tac-Toe Games from the Empty Board Start with an empty 3-by-3 Tic-Tac-Toe board. X always moves first, and the players alternate placi...
Design an Alert Notification Service for Downstream Consumers
Design an Alert Notification Service for Downstream Consumers Design an alert-notification system whose recipients are downstream services rather than...
Design a Space-Efficient Versioned Recipe Shopping Cart
Design a Space-Efficient Versioned Recipe Shopping Cart Design an in-memory shopping cart for a cooking app. Each recipe has an ID and a list of ingre...
Design a Stateful Working Hours Register
Design a working-hours register for employees who badge into and out of an office. Describe the data model, public operations, validation rules, and a...
Schedule Priority Jobs with Cooldowns
Schedule Priority Jobs with Cooldowns Implement a scheduler for recurring jobs: `text addJob(job_id, priority, cooldown) -> bool getJob() -> job_id or...
Design a Thread-Safe Buffered Writer with a Background Flush Thread
This question assesses a candidate's ability to design a concurrent, thread-safe component that decouples fast in-memory writes from slower disk I/O u...