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Software Engineer 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 1051–1080 of 1189 results
- SnowflakeMediumSoftware EngineerDesign a Shared User Quota Service That Never Overdraws
Design a quota service that several services draw from for each user, where the balance must never be overdrawn under highly concurrent requests and must stay strongly consistent. It tests atomic conditional updates, reserve-and-commit APIs with idempotency, replication choices, and scaling a single hot user's quota.
System DesignTechnical Screen - SnowflakeHardSoftware EngineerDesign a concurrent web crawler
This problem evaluates your ability to design a distributed, concurrent web crawling architecture that balances high throughput with politeness policies, concurrency control, and robust state management.
System DesignOnsiteConcurrencyDistributed SystemsCaching - SnowflakeEasySoftware EngineerDesign a disk-backed KV store under contention
This problem tests the ability to design a persistent key-value store that balances disk I/O, memory caching, and thread safety under high concurrency.
System DesignOnsiteConcurrencyStorage EnginesLSM Trees - SnowflakeHardSoftware EngineerDesign a distributed system end-to-end
This question evaluates a candidate's ability to design scalable, multi-tenant distributed analytics platforms, testing competencies in distributed systems architecture, data layout and storage, query planning and execution, metadata management, consistency and replication strategies, fault tolerance, observability, and capacity planning.
System DesignTechnical Screen - SnowflakeMediumSoftware EngineerDesign a distributed tree node counter
Design a distributed tree node counter evaluates requirements, scale assumptions, API/data design, architecture, trade-offs, failure modes, and rollout in a realistic interview setting. A strong answer states assumptions, handles edge cases, explains trade-offs, and shows how to validate the result clearly.
System DesignTechnical Screen - SnowflakeHardSoftware EngineerDesign a multi-tenant quota system
This question evaluates a candidate's ability to design a global multi-tenant quota service, testing competencies in distributed systems, data consistency, concurrency control, API and storage modeling, and scalability within the System Design domain.
System DesignTechnical Screen - SnowflakeMediumSoftware EngineerDesign an Audit Logs Service
Tests the ability to design an immutable, highly available, multi-tenant audit logging service that supports high-throughput ingestion and tamper-evident storage while providing fast, tenant-scoped querying.
System DesignTechnical ScreenDistributed SystemsSecurityMulti-Tenancy - SnowflakeMediumSoftware EngineerDesign an Interactive Query Execution Notebook
Tests your ability to design an asynchronous, scalable system for executing interactive SQL queries and streaming execution state and tabular results back to web clients.
System DesignTechnical Screensystem-designdistributed-systemsapi-design - SnowflakeMediumSoftware EngineerDesign an object store with deduplication
This question evaluates a candidate's ability to design scalable, durable object storage systems with deduplication, touching on storage architecture, data modeling, metadata management, consistency, and garbage collection.
System DesignTechnical Screen - SnowflakeHardSoftware EngineerDesign cache for DAG-based query views
This question evaluates a candidate's understanding of caching, consistency, versioning, eviction, and update propagation in DAG-based materialized views, testing competencies in distributed systems, data engineering, and storage-hierarchy design.
System DesignOnsite - SnowflakeHardSoftware EngineerDesign multi-core service startup scheduler
This question evaluates scheduling and resource-management skills, including DAG dependency handling, concurrency bounding, timeout/retry strategies, observability, and correctness reasoning for service startup orchestration.
System DesignOnsite - SnowflakeHardSoftware EngineerDesign under vague distributed requirements
This question evaluates expertise in distributed system architecture, metadata and schema management, transactional DDL semantics, consistency and replication strategies, API and data-model design, multi-tenant isolation, observability, security, and capacity planning.
System DesignTechnical Screen - SoFiHardSoftware EngineerDesign a Random Number Generation API
Design a Random Number Generation API evaluates requirements, scale assumptions, API/data design, architecture, trade-offs, failure modes, and rollout in a realistic interview setting. A strong answer states assumptions, handles edge cases, explains trade-offs, and shows how to validate the result clearly.
System DesignOnsite - SoFiHardSoftware EngineerDesign a Real-Time Suggestions Service
Design a Real-Time Suggestions Service evaluates requirements, scale assumptions, API/data design, architecture, trade-offs, failure modes, and rollout in a realistic interview setting. A strong answer states assumptions, handles edge cases, explains trade-offs, and shows how to validate the result clearly.
System DesignOnsite - SoFiHardSoftware EngineerScale a key-value store with consistent hashing
Scale a key-value store with consistent hashing evaluates requirements, scale assumptions, API/data design, architecture, trade-offs, failure modes, and rollout in a realistic interview setting. A strong answer states assumptions, handles edge cases, explains trade-offs, and shows how to validate the result clearly.
System DesignTechnical Screen - SonatusHardSoftware EngineerDesign a RAG system for vehicle documents
This question evaluates a candidate's ability to design a Retrieval-Augmented Generation system, testing competencies in information retrieval, vector search, document ingestion and chunking, metadata modeling, citation handling, security, observability, and scalability within the system design and NLP/information-retrieval domain.
System DesignTechnical Screen - SotiMediumSoftware EngineerDesign an IP blacklist API
This question evaluates API and backend system design skills for network security and distributed caching, encompassing data modeling for exact IPs and CIDR ranges, cache architecture and invalidation, consistency and failure handling, scaling, and observability.
System DesignOnsite - SpeakHardSoftware EngineerDesign scenario-based speaking feature
This question evaluates system-design competency in building scalable, real-time, multilingual audio-driven learning features, including product modeling, session orchestration, audio pipelines (ASR/TTS), personalization, localization, telemetry, and privacy/security considerations.
System DesignOnsite - SpeakHardSoftware EngineerDesign speaking scenarios and auth/profile API
This question evaluates a candidate's ability to design scalable, real-time speaking-practice features and a minimal authentication/profile API, encompassing system architecture, service decomposition, data modeling, ASR/LLM integration, personalization, security and privacy, and operational concerns like scaling and observability.
System DesignOnsite - Sprinter HealthMediumSoftware EngineerDesign a Game Store with Purchases, Downloads, and Reviews
Design connected game-store pages for category browsing, purchases, authorized downloads, and reviews with consistent data and retry behavior.
System DesignTechnical Screen - Sprinter HealthMediumSoftware EngineerDesign a scalable game app store
This question evaluates a candidate's ability to design a scalable backend system, covering competencies in system architecture, data modeling, distributed services, media asset delivery, secure transactional flows, and operational trade-offs around scalability, availability, and consistency.
System DesignOnsite - StripeMediumSoftware EngineerDesign a Count-Metrics Monitoring Platform
Design a scalable count-metrics monitoring and alerting platform capable of tracking real-time event counts and rates, grouping by dimensional labels, handling duplicate/late events, and enforcing cardinality limits.
System DesignOnsiteDistributed SystemsObservabilityStream Processing - StripeHardSoftware EngineerDesign a Distributed Metrics Counter
This question tests the ability to architect a highly available, scalable system for ingesting and aggregating high-throughput telemetry data while managing trade-offs between consistency and performance.
System DesignOnsiteDistributed SystemsMetricsScalability - StripeHardSoftware EngineerDesign a Feature Flag Service with Percentage Rollouts and Allow/Block Lists
System design question: design a feature flag service, similar in spirit to Amazon's Weblab, that lets teams turn features on or off, roll them out to a percentage of users, and force them on or off with allow and block lists. It probes where flag checks run, how users are assigned consistently, and how changes reach every service safely.
System DesignTechnical Screen - StripeMediumSoftware EngineerDesign a Merchant Ledger Service
This question tests your ability to design a distributed ledger system that ensures high transactional integrity, strict consistency for financial balances, and reliable idempotency in a high-concurrency environment.
System DesignOnsiteDistributed SystemsDatabase DesignConsistency - StripeMediumSoftware EngineerDesign a Scalable Idempotent Ledger Service
Design a high-throughput, fault-tolerant double-entry ledger service featuring immutable postings, strict write idempotency, and tunable balance freshness.
System DesignTechnical ScreenDistributed SystemsDatabase DesignFinancial Systems - StripeMediumSoftware EngineerDesign a Superhero Dispatch System
This question evaluates a candidate's ability to design reliable, distributed backend systems with emphasis on transactional correctness, concurrency control for single-winner acceptance races, geo-spatial querying for proximity matching, eventing/notification pipelines, and operational observability for mission-critical dispatch.
System DesignOnsite - StripeHardSoftware EngineerDesign a local activity counter service
This question evaluates a candidate's skills in designing large-scale distributed systems, focusing on near-real-time ingestion and aggregation, idempotency/deduplication, time-windowed (tumbling and sliding) analytics, hot-key sharding, storage and backfill strategies, and operational concerns including monitoring and privacy.
System DesignTechnical Screen - StripeMediumSoftware EngineerDesign an Idempotent Double-Entry Ledger
Design a highly reliable, idempotent double-entry ledger system that guarantees strict consistency, append-only immutability, and supports high-concurrency writes on hot accounts.
System DesignTechnical Screensystem-designfintechdistributed-systems - StripeHardSoftware EngineerDesign ledger and bikemap integration
This question evaluates competency in designing strongly consistent financial ledgers and integrating an external routing service, testing data modeling, distributed transactions, linearizability and idempotency, scalability, security, API design, and observability in the System Design domain.
System DesignOnsite
Snowflake
SoFi
Stripe