System Design interview questions

Showing 1021–1050 of 1311 results

• Design a game leaderboard serviceEasy

  This question tests the ability to design a high-throughput, low-latency leaderboard service capable of handling frequent rank updates and read requests for millions of active users.

  RedditSoftware EngineerSystem DesignOnsite
• Build a Transfer-Fee Comparison PrototypeMedium

  Design an extensible remittance fee-comparison engine that aggregates quotes across multiple providers, normalizes explicit fees and FX spreads, and gracefully surfaces provenance, staleness, and provider failures.

  RemitlyStaff AI-Native EngineerSystem DesignTechnical Screen
• Design a Production-Ready URL ShortenerHard

  This question evaluates competency in designing a scalable, reliable, and secure production URL shortening service, covering API design, link data modeling and analytics, ID/token generation, caching and read/write paths, partitioning/replication/consistency choices, rate limiting and abuse mitigation, TTL handling and cleanup, and HA/DR and monitoring. Commonly asked in system design interviews to probe architectural trade-offs for high-read consumer services, it belongs to the System Design domain and emphasizes practical application of distributed systems and operational concepts rather than only conceptual theory.

  RemitlySoftware EngineerSystem DesignOnsite
• Design an IP Address Filtering ServiceEasy

  Design a low-latency service that allows or denies traffic using source or destination IP rules. Candidates must define conflict precedence, address normalization, versioned rollout, stale-state behavior, audit evidence, privacy-conscious logging, and safe rollback.

  RemitlySoftware EngineerSystem DesignOnsite
• Whiteboard and Deep Dive a Past ProjectHard

  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.

  RemitlySoftware EngineerSystem DesignOnsite
• Rate Limit an API During a Traffic AttackMedium

  Design API rate limiting with token buckets, layered identities, endpoint costs, distributed-state tradeoffs, and measurable protection of legitimate traffic.

  RenderSoftware EngineerSystem DesignTechnical Screen
• Design a Multi-Channel Notification SystemMedium

  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.

  ReplitSoftware EngineerSystem DesignOnsite
• Design a Weighted Log DistributorMedium

  This question tests your ability to design a distributed system that routes incoming log streams to multiple storage clusters based on specified weight configurations while ensuring high availability and fault tolerance.

  Resolve.AiSoftware EngineerSystem DesignOnline Assessment
• Design a Cloud Call-Center Platform for Programmatic Outbound CallsHard

  This question evaluates a candidate's ability to design a distributed, asynchronous system under hard external rate and capacity constraints. It tests system design fundamentals such as queueing, backpressure, state-machine modeling, and multi-tenant fairness, commonly asked to assess architectural reasoning at a practical, applied level rather than pure theory.

  Retell AISoftware EngineerSystem DesignTechnical Screen
• Design a Smooth Per-Customer Calls-Per-Second ControllerMedium

  Design a distributed outbound call pacing service that enforces smooth per-tenant calls-per-second (CPS) rate limits while ensuring durable queueing, priority scheduling, and safe failover.

  Retell AISoftware EngineerSystem DesignTechnical Screen
• Design and Implement a Mini SQL Query EngineHard

  This question evaluates a candidate's ability to design and build a small SQL query engine, covering tokenization, parsing, and query execution over in-memory tables. It tests system design and compiler-style thinking, including how to scope a large problem into an extensible v1 and reason about extending it with sorting, aggregation, and joins. This is a system design and practical implementation question assessing both architectural judgment and coding ability.

  Retell AISoftware EngineerSystem DesignTechnical Screen
• Design collaborative document editing backendMedium

  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.

  Retell AISoftware EngineerSystem DesignOnsite
• Design car rental schema and APIsHard

  This question evaluates data modeling, transactional integrity, concurrency control, REST API and workflow design, and system scalability within the car rental domain in the System Design category.

  RetoolSoftware EngineerSystem DesignTechnical Screen
• Design automatic travel insurance enrollment triggered by customer locationMedium

  A system design exercise for a banking app that automatically enrolls opted-in customers in travel insurance when location signals show they are abroad. It tests requirements scoping, an event-driven pipeline, idempotent enrollment with an insurer, data modeling, scaling reads and writes, and failure handling.

  RevolutSoftware EngineerSystem DesignOther
• Design multi-region banking data synchronizationMedium

  This question evaluates competency in distributed systems and data consistency for financial applications, emphasizing replication, transaction correctness, conflict resolution, idempotency, and operational resilience.

  RevolutSoftware EngineerSystem DesignTechnical Screen
• Build Reliable Employee-Operations and Expense Intelligence SystemsHard

  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.

  RipplingSoftware EngineerSystem DesignOnsite
• Design News Pull Scheduling, Article Storage, and Topic ReadsMedium

  Design a scalable topic-based news aggregation system covering distributed feed scheduling, idempotent article ingestion, stable pagination, and a low-latency read path.

  RipplingSoftware EngineerSystem DesignTechnical Screen
• Design a Deduplicated Personalized News FeedMedium

  Design a news aggregation and recommendation system that ingests multi-publisher articles, clusters coverage of identical real-world events, and serves a personalized, deduplicated feed with low latency.

  RipplingSoftware EngineerSystem DesignTechnical Screen
• Design a Google News-like aggregatorHard

  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.

  RipplingSoftware EngineerSystem DesignOnsite
• Design a Hotel Booking SystemHard

  This question tests your ability to design a distributed system that manages transactional integrity, high concurrency during bookings, and efficient searching for room availability.

  RipplingSoftware EngineerSystem DesignOnsite
• Design a Hotel Search and Reservation SystemMedium

  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.

  RipplingSoftware EngineerSystem DesignOnsite
• Design a News Aggregation FeedMedium

  This question evaluates expertise in large-scale system design—specifically data ingestion, article clustering/deduplication, feed ranking and personalization, API and data-model design, scalability, reliability, and monitoring—within the System Design domain.

  RipplingSoftware EngineerSystem DesignTechnical Screen
• Design a News Aggregation ServiceMedium

  Design a scalable news aggregation platform that ingests high-volume publisher feeds, clusters and deduplicates coverage into cohesive stories, and serves fresh, personalized feeds with sub-second latency.

  RipplingSoftware EngineerSystem DesignTechnical Screen
• Design a News Aggregation System (Google News-style)Medium

  Design an end-to-end news aggregation platform that ingests articles at scale, deduplicates syndicated content, clusters articles into evolving story threads, and serves low-latency feeds.

  RipplingSoftware EngineerSystem DesignTechnical Screen
• Design a News Aggregator That Builds Personalized Feeds from Publisher APIsMedium

  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.

  RipplingBackend EngineerSystem DesignOnsite
• Design a Personalized News Feed AggregatorMedium

  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.

  RipplingSoftware EngineerSystem DesignOnsite
• Design a Scalable News FeedMedium

  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.

  RipplingSoftware EngineerSystem DesignOnsite
• Design a User Behavior Tracking (Clickstream Analytics) SystemMedium

  Design a scalable clickstream analytics pipeline capable of ingesting high-throughput user interaction events, handling duplicate and out-of-order data, and supporting both real-time aggregated dashboards and raw behavioral query paths.

  RipplingSoftware EngineerSystem DesignTechnical Screen
• Design a delivery cost systemMedium

  A Rippling software-engineer system-design screen: build an object-oriented, in-memory delivery cost dashboard that registers drivers with hourly rates, records completed deliveries, and reports total cost, paid and unpaid amounts via an idempotent payUpTo cutoff, and the maximum number of drivers simultaneously delivering in the last 24 hours. It tests time-interval modeling, exact monetary arithmetic without floating-point drift, sweep-line concurrency counting, idempotency, time-zone handling, and thread-safe O(1) dashboard reads. The walkthrough covers both prorated and whole-delivery payment semantics, a full Python reference implementation, and the production hardening a real payroll service would need.

  RipplingSoftware EngineerSystem DesignTechnical Screen
• Design a flexible expense reimbursement systemHard

  This question evaluates system design and architecture skills for building a policy-driven, explainable expense reimbursement platform, specifically testing competencies in rule engines and DSL/config design, versioning and immutable evaluations, group-level aggregation and conflict resolution, data modeling and partitioning for scale, API and workflow design, observability/auditing, and access control. As a System Design interview prompt it is commonly asked because it forces candidates to articulate trade-offs between extensibility, explainability, consistency, and performance; the assessment targets practical application of architectural principles with strong conceptual reasoning.

  RipplingSoftware EngineerSystem DesignTechnical Screen