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Designs user preferences, channel rules, unsubscribe behavior, digest generation, and delivery suppression.
Design list endpoints with pagination, filtering, sorting, limits, and database-aware performance behavior.
Designs layered public API protection with caller identity, quotas, burst limits, abuse signals, and client-friendly responses.
Designs authorization that combines roles, permissions, tenant context, resource ownership, and auditability.
Designs live updates with polling, server-sent events, or WebSockets while preserving authorization, ordering, scale, and fallback behavior.
Designs scheduled jobs with locking, idempotency, observability, retries, and safe operations across multiple instances.
Builds request and response contracts that tolerate independently deployed clients through explicit ownership, additive evolution, stable semantics, and measured deprecation.
Design request DTOs that protect API contracts from domain and persistence models.
Designs saved filters, scheduled matching, alert delivery, and freshness trade-offs for search-driven product workflows.
Designs search and filtering with controlled query contracts, indexing, pagination, ranking, and operational limits.
Designs plan entitlements, provider webhooks, idempotent billing updates, access checks, grace periods, and support overrides.
Designs a controlled support impersonation workflow with scoped access, approvals, visible banners, audit trails, and session boundaries.
Designs membership, role changes, removal, ownership transfer, and permission updates without weakening tenant boundaries.
Designs an invitation workflow with token security, expiry, membership creation, email delivery, and replay-safe onboarding.
Designs a settings service with defaults, validation, scoped preferences, caching, and safe rollout of new settings.
Investigate a slow API by checking database queries, blocking async, dependency latency, serialization, logging, and runtime pressure.
Explains command messages versus event messages and how ownership changes their design.
Explains EF Core projections into DTOs with practical .NET data-access examples and production trade-offs.
Explains raw SQL in EF Core with practical .NET data-access examples and production trade-offs.
Explains split queries versus single joined queries with practical .NET data-access examples and production trade-offs.
Compare minimal API endpoint filters and MVC filters by context, scope, and use case.
Maps an HTTP ETag precondition to EF Core rowversion and returns 412 when the representation is stale.
Implements representation-aware ETags and conditional GETs correctly, including validators, 304 metadata, authorization, cache variation, generation cost, and tests.
Treats JSON serialization settings and DTO shape as a public contract, including naming, enums, nulls, converters, compatibility, and tests.