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Code review · Refactoring · Quality

How Professional Developers Use AI to Improve Code

Writing code that works is one thing. Writing code that is clean, maintainable, efficient, and readable is another -- and AI has become a surprisingly capable code reviewer that is available any time, never too busy, and never too polite to give honest feedback. Professional developers use it to refactor messy code into something more readable, identify performance bottlenecks, spot security vulnerabilities, improve naming and structure, and get a second opinion before submitting a pull request. The key advantage over a human reviewer is speed and availability: you can get detailed feedback on a function in seconds, iterate immediately, and arrive at code review with something already meaningfully improved.

5 Best Prompts for Improving Code to Ask Claude or ChatGPT

Copy any prompt below and paste it directly into your AI of choice.

  1. Prompt 01 · Refactor for readability

    "Here is some code I have written: [paste code]. Can you refactor it for readability and maintainability -- better variable and function names, cleaner structure, removal of duplication -- while keeping the behavior identical? Explain the main changes you made and why."

    Best for: code that works but that you or your team will struggle to read in six months.

  2. Prompt 02 · Review for security issues

    "Here is my code: [paste code]. Can you review it specifically for security vulnerabilities -- things like SQL injection, XSS, insecure data handling, improper authentication, or exposed secrets -- and suggest how to fix each issue you find?"

    Best for: a security-focused code review before shipping anything that handles user data.

  3. Prompt 03 · Optimize for performance

    "Here is a function that is running slower than I would like: [paste code]. Can you identify the performance bottlenecks, suggest optimizations, and rewrite the critical sections? Please explain the trade-offs of each optimization so I can make an informed choice."

    Best for: code that is functionally correct but causing performance problems in production.

  4. Prompt 04 · Pre-PR review

    "I am about to submit this code for review: [paste code]. Can you act as a senior engineer and give me honest feedback -- what would you approve, what would you request changes on, and what would you flag as a blocker? I want to catch issues before my teammates do."

    Best for: improving code before human review so the review conversation focuses on genuinely complex decisions rather than basic issues.

  5. Prompt 05 · Explain and document

    "Here is some code I inherited or wrote a while ago: [paste code]. Can you: (1) explain in plain English what it does and how it works, (2) identify anything unusual or potentially problematic, and (3) write clear inline comments and a docstring so the next person to read it does not have to reverse-engineer it?"

    Best for: code that works but has no documentation and that you need to understand or hand off.