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Aporeon interview preparation

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API Contracts & Design

Validation, request and response boundaries, pagination, errors, versioning, OpenAPI, idempotency, compatibility, security boundaries, and contract governance.

16 drillsPractice one at a timeOrdered pathComparison questionArchitecture scenarioSystem designCode review

Recommended start

Binding vs Validation

Compare request binding and validation responsibilities in ASP.NET Core APIs.

Medium~7 minStep 1 of 16

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1Binding vs ValidationRecommended startCompare request binding and validation responsibilities in ASP.NET Core APIs.Comparison questionMedium~7 min.NETASP.NET CoreC#Practice 2ProblemDetails vs Custom ErrorsUses RFC 9457 Problem Details as a stable, safe error contract with documented problem types, actionable extensions, and centralized ASP.NET mapping.Comparison questionMedium~7 min.NETASP.NET CoreC#Practice 3Route vs Query vs BodyPlaces identity, optional selection controls, command representations, headers, and files in predictable HTTP locations while accounting for security, caching, limits, and model binding.Comparison questionMedium~7 min.NETASP.NET CoreC#Practice 4Request DTOsDesign request DTOs that protect API contracts from domain and persistence models.Architecture scenarioMedium~10 min.NETASP.NET CoreC#Practice 5Validation StrategyPlaces contract, use-case, domain, authorization, and database validation at the boundaries that can enforce each rule consistently.Architecture scenarioMedium~10 min.NETASP.NET CoreC#Practice 6Pagination & FilteringDesign list endpoints with pagination, filtering, sorting, limits, and database-aware performance behavior.Architecture scenarioMedium~10 min.NETASP.NET CoreC#Practice 7API VersioningIntroduces API versions only for unavoidable breaks, with explicit routing, versioned documentation, migration support, telemetry, deprecation, and removal criteria.Architecture scenarioMedium~10 min.NETASP.NET CoreC#Practice 8OpenAPI ContractUse OpenAPI for API design, client integration, testing, and contract review in ASP.NET Core services.Architecture scenarioMedium~10 min.NETASP.NET CoreC#Practice 9Idempotent POSTMakes POST retries return one durable business outcome by combining scoped keys, request identity, atomic ownership, response replay, and reconciliation.Architecture scenarioHard~12 min.NETASP.NET CoreC#Practice 10API CompatibilityBuilds request and response contracts that tolerate independently deployed clients through explicit ownership, additive evolution, stable semantics, and measured deprecation.Architecture scenarioHard~12 min.NETASP.NET CoreC#Practice 11Security BoundariesSeparates identity issuance, untrusted client behavior, API authorization, tenant isolation, resource checks, and token-handling responsibilities.System designHard~20 min.NETASP.NET CoreC#Practice 12Public vs Internal APIsCompare public and internal APIs in terms of compatibility, documentation, security, support, and evolution speed.Architecture scenarioMedium~10 min.NETASP.NET CoreC#Practice 13Error Handling StrategyDesign API error handling across validation errors, conflicts, auth failures, not-found responses, and unexpected exceptions.Architecture scenarioHard~12 min.NETASP.NET CoreC#Practice 14API ConsistencyExplain API behavior when data and operations cross services with separate data ownership.System designHard~20 min.NETASP.NET CoreC#Practice 15Breaking API ChangeReviews a proposed response-field rename by finding consumers, classifying the break, choosing a migration path, and proving rollout and removal are safe.Code reviewHard~12 min.NETASP.NET CoreC#Practice 16JSON contract evolutionTreats JSON serialization settings and DTO shape as a public contract, including naming, enums, nulls, converters, compatibility, and tests.Architecture scenarioMedium~10 min.NETASP.NET CorePractice

Practice order

16 drillsOne at a time

1Binding vs ValidationUp next / Medium / ~7 min
2ProblemDetails vs Custom ErrorsMedium / ~7 min
3Route vs Query vs BodyMedium / ~7 min
4Request DTOsMedium / ~10 min
5Validation StrategyMedium / ~10 min
6Pagination & FilteringMedium / ~10 min
7API VersioningMedium / ~10 min
8OpenAPI ContractMedium / ~10 min

+8 more drills in this section