Webhooks are HTTP callbacks that third-party services use to notify your application of events. Building a reliable webhook receiver requires handling retries, verifying authenticity, and processing events idempotently.
Why every public API needs rate limiting, the common algorithms and their tradeoffs, and how to implement it without reinventing the wheel.
The differences between JWTs, server-side sessions, and OAuth2, and how to choose the right mechanism for the authentication problem you are actually solving.
Three architectural styles, their actual tradeoffs, and how to choose between them without falling into the microservices trap.
Two concepts that are constantly confused and constantly misimplemented. Here is what each means and how to get both right.
