Technical debt is a metaphor for the extra work you take on later when you choose an expedient implementation now. Like financial debt, it lets you ship sooner but charges interest: every future change in that area is slower and riskier.
Why it matters
Some debt is a reasonable trade, for example launching an MVP before a deadline. Unmanaged debt, however, makes features take longer, causes more bugs and frustrates developers. Teams that track it can decide deliberately when to repay it, usually through refactoring.
Example
A team hard-codes shipping rules in five places to meet a launch date. Months later a new carrier is added, and a developer must find and edit all five, missing one and causing wrong prices. Repaying the debt means moving the rules to one module, which takes a few days once but saves effort on every later change.
Common mistakes
- Treating all messy code as debt; code that is ugly but never changes costs little.
- Never scheduling repayment, so the interest compounds until work grinds to a halt.
- Taking on debt without recording it, so nobody remembers why a shortcut exists.
Related
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