Interview questions
Find a company or topic. Read the sources, then practice.
Loading the question library…
Find a company or topic. Read the sources, then practice.
Loading the question library…
Showing 1,451–1,475
Fast ad selection over changing campaign data, with strict budget enforcement despite concurrent serving and delayed impression events.
Companies: Amazon, Google, Meta, Pinterest
budget-enforcement · cache-invalidation · event-streaming · idempotency
Versioned configuration management: separating drafts from published releases, atomic publication, safe rollback, and a clear contract with an external renderer.
Companies: Decagon
data-modeling · api-design · configuration-versioning · optimistic-concurrency
Companies: Anthropic
Companies: Anthropic
A shared platform for untrusted applications: source builds, safe releases, HTTP routes, and tenant isolation.
General practice
application-lifecycle · deployment-recovery · request-routing · resource-capacity
Large immutable artifacts: complete publication, private downloads, shared image layers, and global transfer costs.
General practice
access-control · cdn · consistency · content-addressing
Cash delivery and account changes must agree despite repeated requests, lost responses, uncertain device evidence, and concurrent account use.
General practice
account-funds · cash-deposits · device-failures · operation-recovery
E-book delivery and offline sync, with conflicting changes across devices and stable locations for notes and highlights.
General practice
conflict-resolution · content-delivery · data-consistency · document-anchors
Product search with variant filters, exact facet counts, and fresh results as prices and stock change.
General practice
catalog-update-propagation · data-modeling · eventual-consistency · faceted-search
Partial returns, uncertain external results, and limited replacement stock complicate item eligibility and correct order and inventory updates.
General practice
cross-service-failure-recovery · inventory · item-lifecycle-correctness · missing-completion-signals
Patient records with fine-grained access, clinical corrections, sensitive documents, and evidence of access and changes.
General practice
audit-logs · authorization · data-consistency · data-versioning
Prescription and refill rules must remain safe during pharmacy delays, repeated requests, transfers, and access changes.
General practice
duplicate-fulfillment · patient-privacy · pharmacy-delays · prescription-changes
A multi-tenant email service with uncertain delivery outcomes, delayed bounce reports, shared capacity, and sender reputation risks.
General practice
delivery-retries · idempotency · rate-limits · sender-reputation
Search across private email content with fresh results, low query latency, and strict mailbox access checks.
General practice
access-control · attachment-text · change-freshness · query-latency
Endpoint telemetry at fleet scale, with strict agent limits, delayed events, and safe host isolation.
General practice
detection-latency · event-ingestion · multi-tenancy · offline-devices
Partial releases, refunds, and disputes compete for one deposit while external transfers can have unknown outcomes.
General practice
cancellations · deposit-limits · disputes · partial-releases
Fresh location streaming and road-aware arrival predictions: noisy GPS, changing traffic, reconnects, and trip-scoped access.
Companies: Uber
authorization · caching · map-matching · real-time-messaging
Reliable data transfer across different systems: partial failures, incremental updates, and changes to source schemas.
General practice
data-consistency · etl · fault-recovery · incremental-updates
Diagnose an existing inference service, control overload, keep features fresh through zone failures, and migrate models and feature schemas safely.
Companies: Reddit
ml-serving · capacity-planning · backpressure · caching
Group expenses: exact shares, correct balances after edits and settlements, and simpler transfers that preserve what each member owes.
General practice
concurrency · debt-simplification · financial-arithmetic · idempotency
Scoped retry protection across concurrent requests, worker crashes, and a fixed result lifetime.
General practice
concurrency · data-retention · failure-recovery · idempotency
Changes to joined tables can affect many results, which creates difficult trade-offs between correct totals, fresh results, and recovery cost.
General practice
backpressure · change-data-capture · checkpointing · consistency
Declarative cloud changes: plan accuracy, shared state, concurrent changes, and recovery after partial failure.
General practice
cloud-apis · concurrency-control · declarative-state · failure-recovery
Correct invoice balances under concurrent payments and credits, fixed issued documents, and a complete audit history.
General practice
audit-history · balance-correctness-and-reconstruction · concurrent-financial-changes · multi-tenancy
Offline maps: compact regional data, local route search, small updates, and safe operation when downloads fail.
General practice
download-failures · incremental-updates · map-data · on-device-routing