Software Engineer Interview Questions
Practice 4,657 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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"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."
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"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."
Maximize points with limited coworker skips
You and a coworker must unload a sequence of warehouses. For warehouse i there are c[i] items (non‑negative integers). Turns alternate starting with y...
Find value on most distinct levels
Given a binary tree whose nodes store values (e.g., characters), find the value that appears on the greatest number of distinct depth levels. For exam...
Compute matrix trace and support updates
Given an n x n integer matrix M, implement a function trace (M) that returns the sum of its main diagonal. Follow-ups: (a) If you receive q point upda...
Design two-user communications handler with exceptions
Implement a two-user communications handler. Create: (A) CommsHandler(CommsHandlerABC) with methods connect(self, user1: Caller, user2: Caller) -> str...
Contrast processes and threads
What are the differences between processes and threads? Compare memory isolation, resource ownership, scheduling, context-switch cost, inter-process c...
Validate a simplified numeric string
Implement isValidNumber (s) that returns true if and only if the ASCII string s represents a valid number under these simplified rules: - Optional lea...
Check strings against dictionary efficiently
Given a large dictionary of unique words and a list of query strings, return for each query whether it exists in the dictionary. The dictionary may co...
Compress vertices into uniques and indices
You are given an array of vertices (a 2D array). Each vertex may repeat. Implement a simple “compression” that produces: 1. unique_vertices: the list ...
Find minimum-latency path across dependent services
You are given a set of services and directed dependencies between them. Each dependency edge represents a call from one service to another with a know...
Design a bank system with scheduled transfers
Bank System (OOD): Accounts, Transfers, Scheduling, Top Spending, Merge Design an in-memory banking system that supports: - account creation - deposit...
Count visible people to the right
Problem You are given an array heights of length n, where heights[i] is the height of the i-th person standing in a line from left to right. For each ...
Find root IDs and paths
You are given a collection of string blocks, each represented as a JSON object with fields {"id": string, "parentId": string | null}. A block is a roo...
Find most frequent call stack from logs
Given an array of log entries for a single-threaded program's function calls, each entry is either '->Name' (function entry) or '<-Name' (function exi...
Manipulate time-series with Pandas groupby
Given a DataFrame events(user_id, event_type, ts_utc, revenue): 1) Parse ts_utc as timezone-aware, convert to America/Los_Angeles, and handle DST tran...
Minimize adjacent-color assignment cost
Minimize adjacent-color assignment cost You are given H linear items (e.g., houses) and an H×C cost matrix where cost[i][c] is the cost of assigning c...
Compute peak busy dashers with overlaps
You are given delivery logs as (dasherId, startTime, endTime) with integer times, where endTime is exclusive. A single dasher may accept multiple orde...
Design a CreditTracker with expirations
Design a CreditTracker class with three methods: ( 1) add_credit(start_time, end_time, credit), ( 2) subtract_credit(time, credit), and ( 3) check_cre...
Deduce row order from logic clues
Logic Ordering Puzzle: Four Coworkers in a Row Context Four coworkers—A, B, C, and D—are standing in a single row, left to right, facing north. Positi...
Find users with access to all cameras
Given entities and relationships (user, owns, camera), (user, belongs_to, group), (group, owns, camera), and (group, belongs_to, group) where groups c...
Track Highest-Earning Experience
You are building a core component for a real-time analytics system that tracks the profitability of experiences on a large online platform. Implement ...