Technical Debt
- In Turkish
- Teknik Borç
In short
Technical debt is the future cost of extra work created when developers choose a quick or limited solution now instead of a better approach that takes longer.
What is technical debt?
Technical debt describes the shortcuts, outdated designs, and messy code that make a software system harder to change over time. The term was coined by programmer Ward Cunningham, who compared these shortcuts to financial debt. Like a loan, it lets a team move faster today, but it has to be repaid later.
The interest on technical debt is the extra time every future change costs. Duplicated code has to be fixed in several places, missing tests make every release risky, and outdated dependencies block security updates. If the debt is never repaid, the interest keeps growing until even small features take weeks.
Not all technical debt is bad. Taking it on deliberately, for example to meet a launch date with a plan to clean up afterward, can be a sound business decision. The real problem is reckless or unnoticed debt, which builds up through rushed work, unclear requirements, or simply because a system and its tools age.
Technical debt is not the same as a bug. A bug is behavior that is wrong, while technical debt is code that works but is harder to understand or change than it should be. Teams pay it down through refactoring, adding tests, upgrading dependencies, and reserving regular time for maintenance.
Key takeaways
- Technical debt is the future cost of shortcuts taken today.
- Its interest is the extra effort every future change requires.
- Deliberate, tracked debt can be a reasonable trade-off.
- Refactoring, tests, and upgrades are how teams pay it down.
Example
// TODO: temporary shortcut for launch; replace with per-country tax rules
function getTax(price) {
return price * 0.2; // hard-coded rate: works today, costly once we sell abroad
}Readers ask
What causes technical debt?
Common causes include tight deadlines, unclear or changing requirements, missing tests, lack of documentation, and dependencies that are never updated. Some debt also appears naturally as technology and business needs change over time.
How do you reduce technical debt?
Make it visible by tracking it like any other work, then pay it down gradually through refactoring, adding tests, and upgrading dependencies. Many teams reserve a fixed share of each development cycle for this.
Is technical debt always bad?
No. Debt taken on deliberately for a good reason, such as meeting an important deadline, can be worthwhile as long as it is tracked and repaid before its cost grows too large.
See also
- RefactoringSoftware Architecture, p. 33Refactoring is the process of restructuring existing code to make it cleaner and easier to maintain without changing what the code does from the outside.
- SOLIDSoftware Architecture, p. 42SOLID is a set of five object-oriented design principles that help developers write code that is easier to understand, extend, test, and maintain.
- Design PatternSoftware Architecture, p. 13A design pattern is a proven, reusable solution to a common problem in software design, described as a general template rather than as finished code.
- MonolithSoftware Architecture, p. 28A monolith is a software application built and deployed as a single unit, where all features share one codebase, one process, and usually one database.
- CI/CDDevOps & Cloud, p. 9CI/CD is a set of automated practices that build, test, and release code changes frequently, so software can be delivered to users quickly and safely.
- Code SmellTeams & Process, p. 5A code smell is a surface sign in code that often points to a deeper design problem, even though the code still works.
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