Over-Engineering: Why a Simple Feature Took Three Weeks

A founder showed me his codebase last month and asked why a simple feature took his team three weeks.

The answer was sitting right there in the code. Layers of abstraction, interfaces wrapping interfaces, base classes nobody else would ever use, all added “for flexibility.” His two developers had built the architecture of a fifty-person company for a product with 300 users.

Something I keep coming back to: abstraction was always a tool for humans, not computers. We added layers because a person had to hold the whole system in their head, and hiding the messy parts behind a clean boundary made that possible. That tradeoff made sense. Compilers have been optimizing those layers away for decades. The machine never needed them.

The math is shifting. When Claude or Copilot can read and change 400 files in one pass, a lot of the abstraction your team built to protect human attention turns into cost with no return. It’s slower to build, harder to change, and more expensive to keep running.

I’m not telling you to let your team write a mess. On a medical device codebase I worked on, the cure for runaway complexity was Domain-Driven Design: better boundaries, not more layers. The goal hasn’t changed. Your team should be able to change the product without being afraid of it.

So when your developers say they need an abstraction “for flexibility,” ask them flexibility for what, and what it costs you today. Sometimes the answer is real. Often it’s habit.

What’s the most over-engineered thing you’ve paid for without knowing it?

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