Production Debugging

Add a regression test after a role-specific incident

Turns a production-only role and payload failure into the smallest durable API regression test.

ADO.NET connection pooling and pool exhaustion

Explains physical connection reuse, pool partitioning, short ownership, exhaustion causes, diagnostics, and why increasing the pool is not the first fix.

Aggregate errors by minute

Aggregates log entries into per-minute error counts with deterministic output.

Aggregate results from parallel work safely

Uses reduction, thread-local state, atomic scalar updates, or indexed output instead of mutating a shared collection from parallel workers.

Apply rate limiting without breaking real clients

Design and debug rate limiting while protecting the API without blocking legitimate users and integrations.

Build a non-destructive post-deploy API smoke check

Checks health, authentication, and one critical read flow after deployment without creating persistent business data.

.NET Full Stack

Full-cycle .NET full-stack interview preparation.

A role-based preparation path covering C#, ASP.NET Core APIs, data access, frontend integration, testing, deployment, system design, real-life scenarios, and behavioral interview topics.

.NET Backend