Technical debt: the invisible loan in your product

Technical debt is one of those terms developers talk about and buyers pay for without always understanding it. The loan metaphor is surprisingly accurate: you borrow time today by taking a shortcut in the code, and pay it back with interest later in the form of slower development. Just like with financial loans, the debt itself isn’t bad – it can be a smart decision. The problem is debt that gets taken on unknowingly and never paid down.

What technical debt actually is

When a team builds fast, it takes shortcuts: a solution that works now but isn’t built to last, a part that never gets cleaned up, a structure that gets messier with every addition. Each such shortcut is a small loan. It gets that specific feature done faster – but it puts interest on all future work in that same part of the code.

Some debt is rational. If you need to launch before a deadline, taking a deliberate shortcut and fixing it afterward can be exactly right, just as a company might borrow to invest at the right moment. The difference between healthy and unhealthy debt comes down to two words: deliberate and paid down. Debt the team knows about and plans to pay off is a tool. Debt nobody keeps track of is a leak.

How the debt shows up for you

You’ll never see the technical debt in the code itself, but you feel the interest in everyday work. The signs are clear once you know what to listen for:

• Simple changes suddenly take much longer than they used to.
• New features cost disproportionately more than their apparent size suggests.
• The same kinds of bugs keep coming back, often in new places.
• Developers start talking about certain parts being “fragile” or say they’d “rather not touch” a certain area.

That last one is the interest expressed in plain language. When a team avoids a part of the system out of fear something will break, you’re already paying on the debt – in the form of caution, workarounds, and time.

Budgeting for paydown

The solution isn’t chasing zero debt, which would be as unreasonable as never borrowing. The solution is paying it down continuously. In practice, that means part of the development capacity each period goes toward improving what already exists, not just building new things.

A common rule of thumb is to set aside a recurring share of every development period for improvement and maintenance. Exactly how much depends on the system’s condition, but the principle is that a little and often almost always beats a lot and rarely. Whoever keeps pushing all maintenance ahead eventually ends up in the most expensive spot of all: a total rebuild.

A scenario: two years without paydown

A company pushed its vendor to only deliver new features, never clean up. The first few months went fast and everyone was happy. After a year, every new feature took twice as long, and after two, the team barely dared touch the core. What had looked like efficiency – all time spent on new work, none on maintenance – had actually built up a debt that now ate half the development budget in pure interest.

Had they instead set aside a small share on an ongoing basis, the pace would have stayed steady, and the expensive cleanup would never have been needed.

The questions that force visibility

Since you can’t see the debt yourself, you need to get the vendor to make it visible. Ask directly which parts of the system they’d rather not touch and why. Ask for an estimate of how much of their time goes toward handling old debt. And require that improvement work shows up as its own line items in the planning, not hidden inside other tasks.

A mature vendor talks openly about the debt and has a plan for it. One that claims there’s no technical debt at all has either not looked or is choosing not to say. If you’d like an independent read on where a system stands, we at Weapp offer that, and a technical assessment puts numbers on the debt before it gets expensive.