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DAY 001

March 18, 2025

Posted by Naveen K. · Senior Cloud Engineer

Prompt Engineering · Code Review

The PR review prompt that saved me 40 minutes on a real enterprise PR

What actually happened

I was reviewing a 300-line diff on a payments service at work. Normally takes me 30–40 minutes to catch everything properly. I pasted this prompt with the diff into Claude - it flagged 2 bugs I would have missed (a race condition in an async handler and a missing null check), plus 3 minor readability issues. The whole thing took 4 minutes instead of 40.

Saved ~36 minutes · Caught 2 real bugs · Tested on Claude Sonnet 4

The workflow - follow these steps

You are a senior software engineer doing a thorough code review. Review the following diff and flag: 1. [Bugs] - actual or potential runtime errors 2. [Security] - injection, auth issues, exposed secrets 3. [Performance] - N+1s, unnecessary re-renders, heavy loops 4. [Edge cases] - empty input, nulls, race conditions Rate each issue: critical / major / minor. Explain why it matters and suggest the exact fix. If a category is clean, say "✓ Looks good." Context: [describe your service in 1 sentence] <diff> [paste your git diff here] </diff>

Works with Claude, GPT-4o, Gemini 1.5 Pro

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