Every development team has heard the phrase "we will fix it later". Sometimes, that shortcut is the right call to meet a deadline. The problem starts when "later" never comes. That is how technical debt is born, and it is one of the biggest factors slowing software companies down.
In this article, we explain the concept, show how to measure it and present strategies to reduce debt without halting the product.
What is technical debt
Ward Cunningham coined the term in 1992. He compared technical shortcuts to a financial loan: you gain speed now, but you pay interest later. That interest shows up as extra time spent on every new feature, bug fix and maintenance task.
Just like financial debt, it is not necessarily bad. The danger lies in failing to keep it under control.
Types of technical debt
Martin Fowler proposed a useful quadrant to classify debt:
- Deliberate and prudent: "Let's ship now and refactor next sprint." It is a conscious decision.
- Deliberate and reckless: "We don't have time for tests." It causes serious problems.
- Inadvertent and prudent: "Now we know how we should have done it." It is part of learning.
- Inadvertent and reckless: it comes from a lack of technical knowledge on the team.
In addition, debt can live in the code, the architecture, the tests, the infrastructure, outdated dependencies or the documentation.
Warning signs
- Simple features take longer and longer to deliver.
- Fixing one bug often creates another.
- Only one person understands a certain part of the system.
- The team is afraid to deploy on Fridays.
- Libraries and frameworks are several versions behind.
- New developers take months to become productive.
How to measure technical debt
There is no single number, but a few indicators help a lot:
- Static analysis tools: SonarQube and similar tools highlight complexity, duplication and quality issues.
- Test coverage in the critical parts of the system.
- DORA metrics: deployment frequency, lead time, change failure rate and time to restore.
- Hotspots: files that change frequently and concentrate many bugs.
- Team perception: a simple survey about which areas get in the way the most.
Strategies to reduce technical debt
1. Make debt visible
Log every item in the backlog with a description of its impact and an effort estimate. What is not visible never gets prioritized.
2. Reserve fixed capacity
Many teams dedicate 15% to 20% of each cycle to technical improvements. This way, reduction happens continuously instead of depending on one big "cleanup sprint".
3. Follow the boy scout rule
Leave the code a little better than you found it. When you touch a file, rename confusing variables, extract functions and add tests.
4. Prioritize by business impact
Tackle debt first in areas that change often and affect revenue, security or productivity. Ugly code that nobody touches can wait.
5. Avoid rewriting everything from scratch
Full rewrites tend to run late and reproduce old problems. Instead, prefer gradual replacement, one module at a time.
How to talk about technical debt with management
Translate the problem into business language. Instead of "the code is tightly coupled", say "every checkout change takes twice as long and caused three incidents this quarter". Numbers about time, cost and risk are far more convincing than technical arguments.
Frequently asked questions
Can technical debt be eliminated completely?
No, and that is not the goal. Every living system accumulates some debt. What matters is keeping it under control.
Is a bug technical debt?
Not exactly. A bug is a visible defect. Technical debt, on the other hand, is what makes bugs more frequent and harder to fix.
Conclusion
Technical debt is inevitable, but it can be managed. Make it visible, measure its impact, reserve fixed time to pay it down and prioritize the most critical areas. If your system is getting harder to evolve, WDS Developer can run a diagnosis and propose a modernization plan.