Software Engineering Fundamentals Interview Questions
Practice 350 real Software Engineering Fundamentals interview questions for 2026. Software Engineering Fundamentals interview questions collected from companies like Bitkernel, Apple, Amazon, Google, and NVIDIA — real questions from actual interviews with detailed solutions — form this focused track for interview preparation. Expect coding-first assessments that stress data structures, algorithmic complexity, code correctness, and clean implementation under time pressure, alongside practical questions about debugging, testing, and maintainability. What’s distinctive: employers use these fundamentals to evaluate problem decomposition, complexity trade-offs, and engineering judgment more than memorized tricks. At large tech firms you’ll also see role-specific twists — scalability and operational thinking at Amazon, low-level performance and platform concerns at Apple, and parallel/GPU-awareness at NVIDIA — but the baseline is strong coding fluency. To prepare, prioritize timed coding drills, explain-your-tradeoffs practice, read and write clean production-style code, and rehearse debugging and postmortem-style explanations. Pair algorithm practice with short system and testing exercises so you can both implement and defend your solutions during live interviews.

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Simulate bus boarding with priority and wheelchairs
You are implementing a simplified bus boarding simulator. Model: - Person has at least: - id (string/int) - priority (boolean): if true, they shou...
Design a Train Ticket Booking System
Machine-coding exercise, 90 minutes. Design and implement a train ticket booking system. The implementation should be close to working code and should...
Model Direct-Sold DSP Orders
Design a data model for tracking a direct-sold demand order in a demand-side advertising platform. Context: - The platform manages advertiser demand a...
Design demand-side ads relational tables
You are designing the core relational data model for a demand-side advertising system. Create a normalized schema (tables + key columns + relationship...
How do you conduct a code review exercise?
In a live interview, you are shown a short code change — a diff, a pull request, or a standalone function — and asked to produce written code review c...
Implement a Vending Machine
Design and implement the core logic for a vending machine using object-oriented principles. The machine stores products, accepts bills, tracks the cur...
Build an OAuth-based data migration client
Prompt Build a small command-line program that migrates records from a legacy HTTP API to a new HTTP API. Required steps 1. Obtain an access token usi...
Design a Ride Scheduler
Design an object-oriented scheduler for a single autonomous vehicle. The vehicle starts at a known location at time 0. Ride requests arrive in input o...
Design a multithreaded event logger
Design a multithreaded in-memory event logger for a server application. Requirements: - Many worker threads running in the process need to log events ...
Investigate High Memory Usage
You are the on-call engineer for a delivery platform. System context - Couriers use a mobile app to accept and complete deliveries. - The mobile app c...
Process Sharded Login Logs
You are given user login event logs generated by many servers across multiple regions. The logs are sharded by server or region, so no single machine ...
Explain Compiler Pipeline and LLVM Backend
You are interviewing for a compiler engineer role. Explain the major stages of a modern compiler, then discuss common optimization techniques and how ...
How do you review a design document?
You have an interview on your agenda titled “Design Doc Review.” You are given a written design document for a new feature/service (or a major change ...
Design a task management system with TTL
Task Management System (in-memory) Design and implement an in-memory task management system that supports tasks, users, task assignment with TTL (time...
Build Resilient Aggregation and Debug Routing
This onsite combined two software-engineering exercises: 1. Implement a service method that calls multiple mock downstream APIs, merges their response...
Calculate Playback Counts per Stream
You are given two database tables: streamer | column | type | description | |---|---|---| | streamer_id | integer | Primary key of the streamer | | st...
Review a PR for thread-safe request handling
PR review / debugging prompt (backend) You are reviewing a pull request that introduces a CustomerRequest class used by a web service to build and sen...
Design poker-like hand comparison with custom ranking
Problem Design an object-oriented solution to compare two players' hands in a card game similar to poker. You are given two hands (each a fixed number...
Explain CPU-Bound vs I/O-Bound Work
Define CPU-bound and I/O-bound workloads. Then compare how multithreading, asynchronous I/O, and multiprocessing behave for each type of workload, esp...
Explain DB concurrency, debugging slowness, DDD and CQRS
Backend fundamentals: concurrency, performance investigation, and architecture terms Answer the following backend questions: 1. How do databases handl...