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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.
- 9403
- Questions
- 546
- Companies
- 11
- Topics
- 8
- Languages
Showing 2911–2940 of 3640 results
- RemitlyMediumSoftware EngineerValidate a Bijective Substitution Cipher
Determine whether two printable ASCII strings form a valid one-to-one and onto (bijective) character substitution mapping.
Coding & AlgorithmsOnsiteHash TableStringAlgorithms - RemitlyHardSoftware EngineerWhiteboard and Deep Dive a Past Project
This question evaluates a candidate's end-to-end system design skills, including architecture decomposition, trade-off analysis, data consistency choices, scalability and resiliency patterns, and integration of operational practices for a user-facing distributed service.
System DesignOnsite - ReplitMediumSoftware EngineerDesign a Multi-Channel Notification System
Design a resilient, multi-channel notification service that routes notifications across in-app, email, SMS, and push channels while honoring user preferences, idempotency, rate limits, and provider status tracking.
System DesignOnsiteDistributed SystemsMessage QueuesAPI Design - Retell AIMediumSoftware EngineerDesign collaborative document editing backend
This question evaluates a candidate's ability to design real-time collaborative systems, focusing on distributed systems concepts, concurrency control, consistency models, synchronization, and scalable backend architecture.
System DesignOnsite - RipplingMediumSoftware EngineerAggregate expenses by person, trip, and category
This question evaluates a candidate's ability to perform efficient data aggregation, use associative data structures (maps/dictionaries), and reason about time and space complexity when processing large collections of records.
Coding & AlgorithmsOnsite - RipplingMediumSoftware EngineerAnswer Hiring Manager Behavioral Questions
This question evaluates a candidate's ability to handle interpersonal conflict within a high-stakes technical environment and their capacity to align personal motivations with the company's business model.
Behavioral & LeadershipOnsiteConflict ResolutionLeadershipTechnical Tradeoffs - RipplingHardSoftware EngineerBuild Reliable Employee-Operations and Expense Intelligence Systems
A multi-part system-design interview covering tagged event aggregation, driver-pay accounting, employee offboarding, and an LLM-backed expense assistant. Candidates must distinguish approximate dashboards from exact billing and design reliable workflows across failing dependencies.
System DesignOnsite - RipplingMediumSoftware EngineerCompare Complete or Partial Hands
This question evaluates implementation of card-hand evaluation logic, combinatorial reasoning about incomplete information, and deterministic tie-breaking rules for comparing complete and partial poker-like hands.
Coding & AlgorithmsOnsite - 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 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 - RipplingHardSoftware EngineerDesign a Google News-like aggregator
This question evaluates system design skills for building a large-scale, multi-region news aggregation platform, assessing competencies in ingestion architecture, deduplication and clustering, indexing and retrieval, personalization and ranking, and operational concerns like monitoring, consistency, and compliance.
System DesignOnsite - RipplingHardSoftware EngineerDesign a Hotel Booking System
This question tests your ability to design a distributed system that manages transactional integrity, high concurrency during bookings, and efficient searching for room availability.
System DesignOnsiteConcurrencyDatabase ModelingDistributed Systems - RipplingMediumSoftware EngineerDesign a Hotel Search and Reservation System
Design an end-to-end hotel search and booking platform balancing high-throughput search with strictly consistent, transactional room inventory management across continuous date ranges.
System DesignOnsitesystem-designdistributed-systemsconcurrency - RipplingMediumBackend EngineerDesign a News Aggregator That Builds Personalized Feeds from Publisher APIs
System design question on building a news aggregator that polls many publisher APIs, stores only article metadata, and serves each user a paginated feed from the publishers and categories they follow. It tests polling schedules and stop conditions, rate-limit and outage handling, feed merging with deduplication, stable cursors, and bounded storage.
System DesignOnsite - RipplingMediumSoftware EngineerDesign a Personalized News Feed Aggregator
Design a personalized news-feed system that ingests articles from many sources and builds a home feed. Connect requirements and APIs to data modeling, consistency, scaling, failure recovery, observability, and the important design trade-offs.
System DesignOnsite - RipplingMediumSoftware EngineerDesign a Scalable News Feed
This problem tests your ability to design a high-scale feed delivery system, specifically focusing on the trade-offs between 'push' (fan-out) and 'pull' (fan-in) models for delivering content to users.
System DesignOnsiteScalabilityDatabase ShardingCaching - RipplingHardSoftware EngineerDesign a hotel search and booking system
This question tests the ability to design a distributed, high-concurrency reservation system that handles inventory management, consistency, and search efficiency.
System DesignOnsiteDistributed SystemsConcurrencyDatabase Sharding - RipplingMediumSoftware EngineerDesign a large-scale news app with caching
This question evaluates a candidate's ability to design a scalable news application with emphasis on caching strategies and cross-device read-state synchronization, assessing skills in system architecture, API design, data modeling, distributed caching, and consistency handling.
System DesignOnsite - RipplingMediumSoftware EngineerDesign a music player with favorites cap
This question evaluates a candidate's ability to design and implement in-memory data structures, stateful APIs, concurrency handling, deterministic policy enforcement for a fixed-capacity favorites feature, and reasoning about edge cases like removing the currently playing track or handling invalid IDs.
Coding & AlgorithmsOnsite - RipplingHardSoftware EngineerDesign a news aggregation and feed service
This question tests the ability to design a distributed system capable of ingesting high-frequency news feeds from multiple sources and serving personalized, low-latency content to millions of users.
System DesignOnsiteScalabilityCachingMicroservices - RipplingMediumSoftware EngineerDesign a personalized news aggregator
This question evaluates a candidate's competence in large-scale system design, covering concepts such as high-throughput API ingestion, idempotent processing and deduplication, indexing and storage, caching, and low-latency personalized feed generation.
System DesignOnsite - RipplingMediumSoftware EngineerDesign a scalable logging system
This question evaluates a candidate's ability to design scalable, reliable logging and observability infrastructure, testing competencies in distributed systems, ingestion pipelines, indexing and data modeling, storage and retention policies, multi-tenancy, and performance/reliability trade-offs.
System DesignOnsite - RipplingMediumSoftware EngineerDesign a user behavior monitoring system
This question evaluates a candidate's ability to design scalable, low-latency user event ingestion and analytics pipelines while reasoning about data storage choices and aggregate correctness trade-offs.
System DesignOnsite - RipplingMediumSoftware EngineerDesign an ad-click aggregation and enrichment pipeline
This question evaluates system design and data engineering competencies, focusing on large-scale streaming ingestion, aggregation, enrichment joins, deduplication, and trade-offs between request batching and latency for mobile networks.
System DesignOnsite - RipplingMediumSoftware EngineerDesign in-memory delivery billing core APIs
This problem tests your ability to design an efficient in-memory service for managing delivery billing, requiring careful consideration of concurrency, precision in monetary calculations, and optimized aggregation of billable events.
System DesignOnsiteConcurrencyData StructuresAPI Design - RipplingMediumSoftware EngineerHow would you present a project deep dive?
This question evaluates communication, technical ownership, architectural reasoning, decision-making, and impact measurement competencies, and is categorized as Behavioral & Leadership with relevance to system design and product execution; it tests both conceptual understanding and practical application.
Behavioral & LeadershipOnsite - RipplingMediumSoftware EngineerImplement Food Delivery Billing
This problem tests your ability to implement complex billing logic involving conditional fee structures, time-based surcharges, and data aggregation.
Coding & AlgorithmsOnsiteAlgorithmsDatetimeData Processing - RipplingMediumSoftware EngineerImplement a RESTful Q&A service
This question evaluates a candidate's ability to design and implement a RESTful web service, covering HTTP API design, CRUD operations, data modeling and persistence choices, input validation, pagination/sorting, and basic testing and documentation practices.
Software Engineering FundamentalsOnsite - RipplingHardSoftware EngineerImplement a minimal local HTTP server
This question evaluates proficiency in network programming, HTTP/1.1 protocol parsing, concurrent server design, request routing and security (including path traversal protection), observability, testing, and graceful shutdown using only the language standard library.
Software Engineering FundamentalsOnsite
Remitly
Retell AI
Rippling