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Diagnose authentication redirect or callback failures after a slot swap or domain change.
Investigate an endpoint accepting invalid data or returning inconsistent validation errors.
Investigate a production issue caused by staging and production slot configuration drifting apart.
Explains database connection pool exhaustion with practical .NET data-access examples and production trade-offs.
Diagnose browser CORS errors after moving an Azure-hosted API or frontend to a new custom domain.
Investigate resource spikes on App Service after a new .NET API release.
Traces duplicate side effects across message delivery, lock ownership, settlement, durable job state, and external idempotency, then repairs affected users safely.
Explains high database CPU after an API change with practical .NET data-access examples and production trade-offs.
Investigate production HTTP 500 errors that start immediately after a deployment slot swap.
Diagnose a .NET API that cannot connect to Azure SQL using managed identity.
Investigate a .NET API that appears to run but sends little or no telemetry to Application Insights.
Explains how to troubleshoot absent logs or telemetry by checking configuration, sampling, sinks, levels, deployment, and correlation.
Implements duplicate suppression while preserving the first event for each idempotency key.
Define logs, metrics, traces, alerts, and dashboards needed to operate an ASP.NET Core API in production.
Distinguishes callable delegate values from publisher-controlled events and makes subscription lifetime explicit.
Distinguishes explicit dependency injection from runtime service lookup and identifies the narrow framework boundaries where scoped resolution is legitimate.
Keeps business policy independent from infrastructure while centralizing concrete dependency assembly at the application edge.
Explains the difference between deploying code and releasing functionality to users using feature flags.
Designs an async export flow for large reports without blocking API requests or exhausting database and memory resources.
Designs dashboard APIs with precomputed metrics, freshness rules, query cost control, and drill-down support.
Designs explicit workflow states, allowed transitions, guard rules, audit history, idempotency, and operational repair paths.
Design API error handling across validation errors, conflicts, auth failures, not-found responses, and unexpected exceptions.
Designs feature flag storage, targeting, safe defaults, auditability, and rollout observability for backend behavior.
Explains batching, tracking control, idempotency, validation, and operational safety for large EF Core imports.