Backend line

Error Handling

Exceptions, Result types, defensive programming

2 sections

Start: Defensive Programming Vs Fail Fast

Mid-level 2

  1. Defensive Programming Vs Fail Fast| Layer | Strategy | Example | |-------|----------|---------| | API/Controllers | Defensive | Validate input, return user-friendly errors | | Application Services | Mixed | Transform external data (defensive), enforce business rules…, not read
  2. Error HandlingUse these notes to articulate how you design resilient error-handling flows that protect throughput, minimize tail latency, and keep services debuggable under load., not read