2023-10-21
Technical debt is a concept that every developer encounters. It refers to the shortcuts or compromises we make in our code that save time now but create extra work later. Like financial debt, a small amount is manageable, but if it accumulates without being addressed, it becomes a serious problem.
There are several ways technical debt builds up. Sometimes we take a shortcut to meet a tight deadline. We know a better approach exists, but there is no time to implement it right now, so we write a quick solution with the intention of coming back to improve it later.
Sometimes it happens because requirements change. We built the feature one way, and then the requirements shifted. Instead of restructuring the code to fit the new requirements properly, we patch it on top of the existing code. After a few rounds of this, the code becomes hard to follow.
It also happens when we learn better ways of doing things. Code that was written with the best knowledge at the time might not hold up as we learn new patterns or as the language evolves. That old code is not wrong, but it is not as good as what we would write today.
The real cost of technical debt is not the messy code itself, it is the slowdown it causes over time. Adding a new feature takes longer because we have to work around the shortcuts from before. Bugs appear in unexpected places because the code is tangled. New developers joining the team take longer to understand the codebase. And the longer we wait to address it, the harder and more expensive it becomes to fix.
The goal is not to eliminate all technical debt. That is not realistic or even necessary. The goal is to manage it so it does not get out of control.
Track it. When we knowingly take a shortcut, leave a comment in the code or create a ticket in the project tracker. This way the debt is visible and can be prioritised.
Pay it down regularly. Dedicate some time in each sprint to address technical debt. It does not have to be a large amount. Even spending a small portion of each sprint on cleaning up code prevents the debt from growing out of control.
Refactor as we go. When we are working on a feature and we touch code that has debt, we can improve it as part of that work. This is often called the boy scout rule: leave the code better than we found it.
Prioritise by impact. Not all technical debt is equally harmful. Focus on the areas that are changed frequently or that cause the most bugs. Debt in a rarely touched module can wait.
Sometimes taking on technical debt is the right decision. If we need to launch a feature quickly to test a hypothesis, spending weeks on the perfect architecture does not make sense. If the hypothesis fails, we throw the code away. If it succeeds, we schedule time to build it properly. The key is making a conscious decision and not pretending the debt does not exist.