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Week 9: Performance, Debugging, and Production Readiness

This week trains incident response habits. Students investigate a realistic issue, isolate root cause, fix safely, and present measurable verification.

Learning Objectives

  • Use a structured debugging process under uncertainty.
  • Capture evidence before and after code changes.
  • Reduce unnecessary renders and network churn.
  • Document root cause and prevention actions.

Detailed Topics

1. Incident Triage Workflow

Define symptoms, identify scope, gather logs and traces, then test hypotheses quickly with minimal risk.

2. Performance Signals in Ecommerce

Watch page hydration delays, repeated API calls, stale cache loops, and expensive renders in cart and checkout paths.

3. Verification and Regression Guardrails

A fix is complete only with measurable improvement and follow-up safeguards such as test additions or monitors.

Pair Session Plan (90 Minutes)

  1. Seed one bug or slow flow in a sandbox branch.
  2. Capture baseline metrics and reproduction steps.
  3. Implement fix and verify measurable improvement.
  4. Write a concise root-cause analysis summary.

Independent Ticket

Deliver one bug-hunt PR with evidence-based verification and one preventive action that lowers recurrence risk.

Mentor Checkpoint

  • Student distinguishes symptoms from root cause.
  • Student uses data, not guesses, to validate the fix.
  • Student identifies at least one long-term safeguard.

Helpful Resources

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