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When Senior Developers Write Bad Code but Juniors Get Blamed

by Arif Ikhsanudin, Backend Developer

You’ve probably seen this before. A junior developer adds a simple if condition… and suddenly, everything breaks.

The reaction? “Who wrote this?”
The answer? “The junior.”

But the real story is usually deeper—and far less fair.

The System Was Already Fragile

In many teams, the codebase looks stable on the surface but is actually fragile underneath.

  • Logic tightly coupled across multiple files.
  • Hidden dependencies no one fully understands.
  • No tests to catch unexpected side effects.

It works… until someone touches it.
And that “someone” is often the newest person on the team.

Senior Code Without Oversight

Experience doesn’t automatically mean quality.

  • Senior developers may move fast and skip structure.
  • “Temporary fixes” turn into permanent spaghetti.
  • No one reviews their code because they are “trusted.”

Without checks, even senior code can become the root of long-term problems.

The Junior Becomes the Trigger

The junior developer doesn’t create the problem—they expose it.

  • Adding a simple condition reveals hidden coupling.
  • Small changes cascade into unexpected failures.
  • Lack of documentation forces guesswork.

The system breaks not because of the change, but because it was never resilient.

Blame Follows Visibility, Not Reality

Managers often see only what changed recently.

  • “It was working before you touched it.”
  • No context of underlying technical debt.
  • No review process to catch issues early.

Blame goes to the last person who made a change, not the one who created the fragility.

The Missing Safety Nets

This situation rarely happens in well-structured teams.

  • Code reviews catch risky changes early.
  • Tests protect against unexpected breakage.
  • Clear architecture reduces hidden dependencies.

Without these, the system becomes a trap for anyone who touches it.

Fix the System, Not the Person

Blaming juniors for breaking fragile systems misses the point. The real issue is lack of structure, oversight, and shared responsibility. Strong teams build systems where changes are safe—not dangerous.

If one small change can break everything, the problem isn’t the junior—it’s the codebase.

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