Software Engineer Interview Questions
Practice 4,824 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.
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"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."
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"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."
Parse a protobuf-like schema and answer queries
This question evaluates proficiency in parsing grammar-like schemas, scope-based name resolution for nested types, symbol-table construction, and desi...
Compute longest common subsequence length
This question evaluates understanding of dynamic programming and sequence processing, measuring competence in reasoning about optimal substructure, ov...
Implement a Tic-Tac-Toe game API
This question evaluates implementation skills in data structures and algorithmic optimization, focusing on efficient state tracking and constant-time ...
Resolve user roles across account hierarchy
This question evaluates understanding of hierarchical data structures, role-based access control semantics, and set/map operations for computing effec...
Crawl Same-Domain Links
Implement a Python function that crawls a website starting from a seed URL and returns all unique pages reachable within the same domain. Assume a hel...
Validate parentheses and find k-th largest
This pair of problems evaluates mastery of fundamental data structures and algorithmic techniques: Problem A tests understanding of stack-based parsin...
Design globally consistent metadata service
This question evaluates expertise in distributed systems and system design, focusing on linearizable consistency, multi-region replication and partiti...
Implement an expiring counter class
This question evaluates a candidate's competency in implementing a sliding-window expiring counter, testing knowledge of streaming algorithms, data st...
Maximize sum without choosing adjacent elements
This question evaluates a candidate's understanding of array-based optimization and dynamic programming concepts for computing a maximum sum under non...
Count three-digit numbers with distinct digits
This question evaluates a candidate's understanding of digit manipulation, basic combinatorics, and implementation of value-range constraints in codin...
Implement agent voting with average and sorting
Design an in-memory “agent voting” module that records ratings agents give to items (e.g., tickets/articles). Requirements: - Each vote is: (agentId, ...
Compute minimum meeting rooms on circular day
This question evaluates a candidate's ability to reason about interval scheduling, circular time wrap-around, and resource allocation for overlapping ...
Find earliest time all riders become connected
You are given a time-ordered log of events involving Uber riders. Each event has a timestamp and two rider names. Event types: 1. t X shared-ride-with...
Count completed car journeys from sensor logs
You are given a time-ordered list of highway sensor logs. Each log entry contains: - timestamp (integer; strictly increasing) - sensor_type (one of "E...
Design a 3-day online donation system
This question evaluates a candidate's ability in large-scale web system design, focusing on reliable payment integration, idempotency and consistency ...
Implement a dictionary without built-in Dictionary
This question evaluates understanding of hash tables and low-level data-structure implementation, including hashing, collision resolution, resizing/re...
Implement power, reduce string, parse tree, debug maze
This multi-part question evaluates numerical algorithms (fast exponentiation), string-processing and reduction logic, recursive parsing and tree const...
Design set with O(1) random access
Design a data structure ("FancySet") that stores unique integers and supports the following operations, each in average O(1) time: - add(x): Insert va...
Design a task system with assignments
This question evaluates data modeling, API/interface design, and system-design competencies—focusing on entity relationships (Task versus Assignment),...
Maximize revenue by choosing one query type
This question evaluates optimization and numerical reasoning skills, specifically selecting a single repetitive action to maximize aggregate revenue u...