12 Counterproductive Coding Practices That Kill Readability

After years of handling messy codebases, the author lists twelve defensive coding “techniques” that actually reduce readability and increase maintenance difficulty.

1. Splitting microservices per table

The programmer treats each database table as an independent microservice, creating a sprawling architecture with many RPC calls, version conflicts, and performance problems.

2. Refactoring code but not releasing to production

New logic is hidden behind a feature switch that is only enabled in the test environment, causing confusion when new developers assume the code is live.

3. Writing excessively long methods

Methods longer than a thousand lines are believed to be more coherent, but they become unreadable and hard to maintain.

4. Deeply nested control structures

Control flow with more than ten nested if/try/else blocks makes the code virtually impossible to follow.

5. Random variable naming

Variables are named arbitrarily (e.g., str1, list2) without reflecting business meaning, leading to confusion later.

6. Misleading comments

Comments are deliberately written with incorrect information, swapping true/false statements or reversing meanings.

7. Changing code without updating comments

Code is modified while the original comments remain unchanged, resulting in mismatched documentation.

8. Copy‑pasting code

Code blocks are duplicated without proper refactoring, causing duplicated logic and hidden bugs.

9. Ignoring technical design documents

Detailed design diagrams are produced, but the actual implementation deviates significantly, leaving developers confused.

10. Refusing to add logging

The programmer never adds logs, making production troubleshooting extremely difficult.

11. Over‑engineering with heavyweight frameworks

Complex rule‑engine frameworks are introduced to solve simple strategy‑pattern problems, unnecessarily complicating the system.

12. Reinventing the wheel

Instead of using proven libraries, custom solutions like a homemade distributed lock are built, which often introduce new issues.

Summary

These twelve practices lower code readability and increase maintenance effort; developers should avoid them.