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Top 50 api design Interview Questions

The most frequently asked api design questions across all roles and companies, ranked by real interview frequency. Updated daily.

50questions
~7htotal time
71companies covered
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1
CodingStart here. 8 questions · ~67 min
API Rate Limiter FunctionMedium
Practice

Implement per-client and per-route sliding-window limits for Oracle Health API requests in linear time.

api designfunction implementationOOracle Health
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2
System Design28 questions · ~234 min
Design a RESTful APIHard
Recently asked

Design a maintainable RESTful API with clear contracts, validation, security, versioning, observability, and reliable failure handling.

api designsystem architectureauthorizationKPMGOCLCStriveworks
Secure LLM Inference APIHard

Design a secure gRPC or REST API layer for serving LLM inferences under strict latency SLAs.

latencyapi designml inferenceCisco
Design Biometric Data APIHard

Evaluates system design skills for secure, scalable APIs processing sensitive data.

api designWhoop
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3
Execution9 questions · ~75 min
HTTP Request Without Browser or CurlMedium

Explain how to construct, send, and validate an HTTP request without using a browser or curl.

api designdeveloper experienceGoogle
Process High-Volume API InputsMedium
Recently asked

Design and execute a plan to process a large stream of API calls under strict latency and reliability constraints.

data processingapi designperformancePalantir technologies
Contract Testing DefinitionHard

Explain contract testing, its role in API delivery, and how to execute it across service teams.

automated testingapi designRisk AssessmentBest Buy
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4
More topics5 questions · ~42 min
Livestream Rankings APIHard
Recently asked

Design a low-latency API that serves correctly ranked Whatnot livestreams to the client application.

APIsapi designdata latencyWhatnot
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Hands-on SQL practiceWrite and run real queries in the editor. 3 drills · ~30 min
Securing Sensitive DataHard
Practice
Practice drill

Return active, non-expired dataset grants while enforcing MFA and role requirements for sensitive data.

data securitydatabase managementdata managementDDelivery Hero
Contact Center Agent Performance MetricsHard
Practice
Recently asked
Practice drill

Compute daily agent call KPIs and SLA using joins, aggregations, and window ranking in a contact center model.

ETLAggregationsData ModelingADP
Detect Consecutive Losing StreaksMedium
Practice
Practice drill

Identify bet365 users with consecutive losing bets above a risk threshold using ordered streak grouping.

abuse trackingData Manipulationsql querybet365
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