A senior engineer costs you real money, and Stripe's research says you're getting a little over half of one. The rest of the week goes to fighting code that's already there. That's technical debt, and once you price it in hours, it stops feeling abstract and starts looking like the biggest line item nobody put on the budget.
Key Takeaways
- Developers spend an average of ~17.3 hours a week on maintenance and bad code, about 42% of the week (Stripe's Developer Coefficient).
- CIOs estimate tech debt at 20–40% of the value of their entire tech estate, with 10–20% of the new-product budget diverted to servicing it (McKinsey).
- Debt compounds: every workaround makes the next change slower.
- The fix is capacity plus discipline, enough senior hands to pay it down instead of only firefighting.
The Number Founders Underprice
Stripe surveyed over 1,000 developers and 1,000 executives and found the average developer spends about 17.3 hours a week on maintenance, roughly 13.5 on technical debt and 3.8 on bad code (Stripe's Developer Coefficient). That's 42% of the week not spent building anything new. Stripe put the global drag near $300 billion a year.
McKinsey came at the same rot from the finance side. In a survey of 50 CIOs at billion-dollar companies, tech debt ran 20 to 40% of the value of their entire technology estate, and 10 to 20% of the budget earmarked for new products quietly got redirected to servicing old debt (McKinsey). Different lens, same conclusion: debt is a tax, and most companies pay far more of it than they think.
For a startup the sting is sharper. You're paying senior salaries and getting a little over half the output on new work, while the debt keeps growing underneath you.
Why It Compounds
Debt isn't static. Every shortcut makes the next change harder, which invites another shortcut. It's negative interest on your codebase. The flip side is just as real: cut the friction and you get time back. getDX's data ties each one-point gain in their developer-experience index to about 13 minutes saved per developer per week. Small stuff, both directions, and it adds up fast across a team.
| Where the week goes | Share |
|---|---|
| Technical debt | ~13.5 hrs |
| Bad code (debug/refactor) | ~3.8 hrs |
| Actual new work | the remainder |
What This Looks Like in Practice
Picture a Series A team of eight. On paper that's 320 engineer-hours a week. Apply Stripe's 42% and roughly 135 of those hours go to maintenance and firefighting before anyone touches the roadmap. So the founder, feeling slow, hires two more engineers. But the new hires inherit the same debt, so they lose the same ~42%, and now more people are changing code they don't fully understand, which tends to add defects rather than remove them (the code-ownership research is clear on that). Six months later the team is bigger, the burn is higher, and velocity barely moved. The debt ate the hire.
The Counterpoint: Not All Debt Is Bad
Worth saying plainly, because "pay down all your debt" is also bad advice. Some technical debt is a smart, deliberate trade: ship the hacky version to test the market, take the shortcut to hit a launch, borrow against the codebase on purpose. That's fine, the same way a business loan is fine. The danger is the unmanaged kind, the debt nobody's tracking and nobody's paying down, that compounds quietly until 42% of the week is gone. The goal was never zero debt. It's debt you chose and can service.
The Capacity Angle
Here's the loop that keeps teams stuck: a team already running at 42% overhead has no slack to pay debt down, so it grows, so the overhead grows. Breaking that cycle usually takes temporary senior capacity, engineers who can carve out and fix the worst debt while the core team keeps shipping. That's one of the most practical uses of staff augmentation: add senior hands specifically to attack the debt, then scale back once the interest rate drops. See available engineers.
Frequently Asked Questions
How much time do developers spend on technical debt?
Stripe's research found about 17.3 hours a week on maintenance and bad code, roughly 42% of the work week, across a survey of 1,000+ developers.
What does technical debt cost a company?
Stripe estimated nearly $300 billion a year globally. McKinsey found CIOs peg it at 20 to 40% of the value of their entire tech estate, with 10 to 20% of the new-product budget diverted to servicing it.
Is all technical debt bad?
No. Deliberate debt taken to hit a launch or test the market is a smart trade, like a business loan. The problem is unmanaged debt that no one tracks or pays down, which compounds silently.
How do I pay debt down without stopping feature work?
Add temporary senior capacity to attack the worst debt while the core team keeps shipping. A team already at 42% overhead rarely has the slack to do both on its own.
The Bottom Line
Technical debt is the tax nobody budgets for, and both Stripe and McKinsey show it's bigger than founders guess. Treat it as a capacity problem: measure it, take it on deliberately when it's worth it, and add senior hands to pay down the debt you didn't choose before it eats another 42% of the week.
Roberto Espinoza is CEO of Ruzora, which helps US startups hire pre-vetted senior LATAM engineers in 72 hours. See available engineers.
