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Software Engineering Fundamentals Interview Questions
Practice 9403 coding, system design and machine learning questions from 546 companies, sorted by role, topic and interview round. Every question has step-by-step hints, a code runner that supports 8 languages and an AI mentor; members also get the full solution walkthrough.
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Showing 901–930 of 1208 results
- RedditHardSoftware EngineerDesign Add, Overwrite, Undo, and Redo for Billing State
Design an in-memory billing account state manager that supports delta adjustments, absolute balance overwrites, and robust undo/redo capabilities.
Software Engineering FundamentalsTechnical ScreenObject-Oriented DesignStackState Machine - RedditMediumBackend EngineerDesign Tennis Scoring with Pluggable Rules
Design a testable tennis game scoring component with point recording, readable scores, terminal-state handling, and stable player identity. Keep standard Deuce and Advantage rules separate from pluggable alternatives such as no-ad scoring, and discuss audit history and serialization.
Software Engineering FundamentalsTechnical Screen - RedditEasyMachine Learning EngineerDesign a Tennis Scoring System
This problem tests your ability to model state transitions, encapsulate logic using object-oriented principles, and implement conditional rule-based scoring in a competitive game.
Software Engineering FundamentalsTechnical ScreenObject-Oriented DesignState MachineLogic - RedditMediumSoftware EngineerImplement a Stateful Chatter Message Store
Design and implement an in-memory message store supporting batch appends, contextual neighborhood queries, text editing with history tracking, and interval merging for read operations.
Software Engineering FundamentalsTechnical Screendata-structuresdesignbinary-search - Reinforce LabsMediumSoftware EngineerWrite SQL to compute current product stock
This problem tests the ability to calculate current stock levels by aggregating historical transaction events against an initial inventory baseline using SQL joins and window functions.
Software Engineering FundamentalsOnline AssessmentSQLAggregationsJoins - Retell AIMediumSoftware EngineerConnect a Local FastAPI Service to an AI Agent Platform to Save and Read Back Issues
A live coding exercise on connecting a local Python FastAPI service to a hosted conversational AI agent platform so the agent can save issues a user reports and read past issues back during a conversation. It tests tool and endpoint design, making a local server reachable, user identification, speech-friendly responses and failure handling.
Software Engineering FundamentalsTechnical Screen - RevolutMediumSoftware EngineerBuild a Java restaurant table booking service that prevents double bookings
A live Java coding exercise to build a restaurant table booking system while an AI assistant is allowed. It tests domain modeling, correct interval overlap logic for tables, a clear table allocation policy, thread safety, and how the candidate tests and stays in control of generated code under time pressure.
Software Engineering FundamentalsOther - RevolutMediumSoftware EngineerExplain DB concurrency, debugging slowness, DDD and CQRS
This question evaluates understanding of database concurrency control and isolation anomalies, backend performance investigation and diagnostic skills, and knowledge of architectural concepts DDD and CQRS, testing competencies in transaction semantics, operational troubleshooting signals, and architectural trade-offs.
Software Engineering FundamentalsTechnical Screen - RiotgamesEasySoftware EngineerChoose Between For and While Loops
This question evaluates your conceptual understanding of control flow structures, specifically focusing on readability, maintainability, and error prevention in loop selection.
Software Engineering FundamentalsTechnical ScreenControl FlowBest PracticesCode Quality - RiotgamesEasySoftware EngineerExplain JavaScript Numeric Edge Cases
This question tests your understanding of IEEE 754 floating-point representation in JavaScript, specifically how the language handles non-numeric values, precision limits, and type safety.
Software Engineering FundamentalsTechnical ScreenJavaScriptIEEE-754Data-Types - RiotgamesEasySoftware EngineerTrace a Web Page Load Through the Browser
Tests an end-to-end understanding of how browsers fetch, parse, and render web pages, spanning low-level networking, DOM/CSSOM creation, script execution, and GPU-driven rendering pipelines.
Software Engineering FundamentalsTechnical ScreenBrowsersNetworkingWeb Performance - RipplingMediumSoftware EngineerBuild an E-Bike Rental Billing Dashboard With Rate Changes Over Time
Design a billing dashboard for a bike-share fleet that prices each ride at the per-minute rate in effect when it started, supports rate changes that take effect at a future timestamp without repricing past rides, and reports an exact running total as a formatted string.
Software Engineering FundamentalsTechnical Screenoop-designbillingidempotency - RipplingEasySoftware EngineerClarify and Find Common Ancestors in a Graph
Reason about graph common ancestors by clarifying edge direction, DAG versus tree structure, self-ancestry, output semantics, and reachability algorithms.
Software Engineering FundamentalsTechnical Screen - RipplingEasySoftware EngineerClarify and Solve Currency Conversion Queries with a Maximum-Amount Follow-up
Analyze currency conversion queries and the reported maximum-amount backtracking follow-up without inventing missing rate or path rules. The solution shows how direction, precision, path consistency, same-currency behavior, and profitable cycles determine the graph algorithm and whether a finite answer exists.
Software Engineering FundamentalsTechnical Screen - RipplingMediumSoftware EngineerDelivery Driver Payroll Tracker With Accrued, Settled and Unpaid Wage Totals
Design and implement an in-memory payroll tracker for hourly-paid delivery drivers that records delivery intervals, reports total and unpaid labor cost, and settles wages up to a given time without ever paying twice. It tests stateful class design, idempotent settlement, treatment of in-progress and late-recorded work, and exact money arithmetic.
Software Engineering FundamentalsTechnical Screen - RipplingMediumSoftware EngineerDesign Extensible Interview Coding Systems
This problem tests your ability to design an extensible rule-evaluation engine using object-oriented principles, specifically focusing on decoupling evaluation logic from business requirements.
Software Engineering FundamentalsOnsiteObject-Oriented DesignDesign PatternsExtensibility - RipplingMediumSoftware EngineerDesign Raw and Computed Spreadsheet Views
Design raw and computed spreadsheet views with formula parsing, dependency replacement, cache invalidation, atomic edits, and undo semantics.
Software Engineering FundamentalsOnsite - RipplingMediumSoftware EngineerDesign a Camel Cards hand evaluator and find best and worst completions
Model five-card Camel Cards hands with an abstract hand type class and a hand class, compare two hands by type and tie-break, then find the best and worst complete hands consistent with a partial hand. Tests object-oriented design, classification logic and step-by-step complexity analysis.
Software Engineering FundamentalsTechnical Screen - RipplingMediumSoftware EngineerDesign a Data-Driven Expense Rule Evaluator
Design an extensible, data-driven expense policy engine that evaluates structured JSON rules against submitted expenses without requiring code deployments.
Software Engineering FundamentalsOnsiterule-enginesystem-designood - RipplingMediumSoftware EngineerDesign a Logger with Independent Handlers
Design an extensible, thread-safe in-process logging framework that supports multiple isolated handlers, immutable log records, backpressure handling, and dynamic handler registration.
Software Engineering FundamentalsTechnical ScreenObject-Oriented DesignConcurrencyAPI Design - RipplingMediumSoftware EngineerDesign a Rule Evaluation Engine for Spending Policy Violations
This problem tests your ability to design a scalable, extensible rule engine that evaluates financial transactions against dynamic spending policies.
Software Engineering FundamentalsTechnical ScreenSystem DesignRule EngineStrategy Pattern - RipplingMediumSoftware EngineerDesign an Extensible Expense Rule Engine
Design an extensible expense rule engine that reports every applicable violation for each expense. The answer separates rule implementations from the evaluation loop, defines deterministic structured results and money handling, and covers boundary tests, malformed data, rule versioning, aggregate-rule extensions, and OOP trade-offs.
Software Engineering FundamentalsTechnical Screen - RipplingHardSoftware EngineerDesign an Extensible Expense Validation Engine
Design an object-oriented validation engine that evaluates an expense report against modular, multi-scoped policies and aggregates all policy violations.
Software Engineering FundamentalsTechnical Screenobject-oriented-designclean-architecturehash-table - RipplingMediumSoftware EngineerDesign an extensible expense rule evaluator
This problem tests your ability to design a flexible and extensible rule evaluation engine capable of processing expense reports against dynamic business policies.
Software Engineering FundamentalsTechnical ScreenSystem DesignDesign PatternsExtensibility - RipplingMediumSoftware EngineerDesign an extensible poker-hand evaluator
This question evaluates object-oriented design and software architecture skills, specifically the ability to define modular classification and comparison responsibilities for a game-hand evaluator as part of Software Engineering Fundamentals.
Software Engineering FundamentalsTechnical Screen - RipplingMediumSoftware EngineerDesign article voting and flip-tracking system
This question tests your ability to design a stateful system for tracking user interactions (upvotes/downvotes) on content while maintaining an audit trail of user activity.
Software Engineering FundamentalsTechnical ScreenObject-Oriented DesignData ModelingConcurrency - RipplingHardSoftware EngineerDesign poker-like hand comparison with custom ranking
This question evaluates object-oriented design, rule-based comparison logic, and algorithmic reasoning for ranking and tie-breaking of card hands, including skills in extensibility and comparison-key representation.
Software Engineering FundamentalsTechnical Screen - RipplingHardSoftware EngineerDesign several backend components
This problem tests your ability to design a robust backend architecture for an employee management system, focusing on data consistency, audit logging, and extensible API design.
Software Engineering FundamentalsHR ScreenSystem DesignDatabase ModelingConcurrency - RipplingMediumSoftware EngineerEvent-Kitchen Prep Scheduler: Dependencies, Priority, Filters
Build a scheduler for a catering kitchen's prep tasks: a task can't start before its dependencies finish, higher-priority ready tasks jump the queue, and a dietary filter can remove tasks whose downstream dependents must then re-route around them. Tests topological ordering, deterministic tie-breaking, cycle handling, and precisely specifying filter-removal semantics.
Software Engineering FundamentalsTechnical Screentopological-sortgraphsheap - RipplingMediumSoftware EngineerExplain JS event loop and related concepts
This question tests your knowledge of the JavaScript runtime architecture, specifically the distinction between macrotasks and microtasks, and your ability to predict execution order in asynchronous programming.
Software Engineering FundamentalsTechnical ScreenJavaScriptEvent LoopAsynchronous
Reddit
Retell AI
Revolut
Rippling