Technical debt: understanding it and reducing it without a full rebuild
What technical debt is, how it builds up in a company's IT estate, and a pragmatic approach to reducing it step by step.
Technical debt is a concept that executive teams often misunderstand. It stands for all the shortcuts, compromises and obsolescence accumulated in an IT estate. Like a financial debt, it generates interest: every change costs more, every incident takes longer to resolve.
How technical debt builds up
- Emergency choices: deploying a quick solution to meet an immediate need, with no durable architecture.
- No maintenance: not applying security updates, not moving software on to newer versions.
- Staff turnover: each departure takes knowledge with it. The code or the configuration becomes incomprehensible.
- Unanticipated growth: a tool sized for 20 users that now serves 200.
- Stacking up solutions: adding building blocks without ever removing any, creating duplicated functionality and fragile data flows.
Assessing your technical debt
Before acting, you have to measure. A few concrete indicators:
- The number of applications running a version the vendor no longer supports
- How often incidents are caused by obsolescence
- The average time to deploy a simple change
- The number of manual processes compensating for a tool’s limitations
- Dependence on a single person to maintain a critical component
Reducing the debt without breaking everything
A complete rebuild (“let’s start again from scratch”) is rarely the right approach. It is expensive, risky and paralyses the organisation for months.
Favour an incremental strategy:
- Map: identify every component of the IT estate and record how critical and how obsolete each one is.
- Prioritise: deal first with anything that presents a security risk or an immediate blocker for the business.
- Isolate: decouple obsolete components from the rest of the IT estate to limit the domino effect.
- Replace in blocks: migrate one module at a time, validating each step with users.
- Document: every piece of work must leave a record the next team can use.
The role of the leadership team
Technical debt is not a purely technical subject. It is a strategic risk, and the trade-offs belong at leadership level, with a dedicated budget and regular tracking. Devoting 15 to 20% of the annual IT budget to reducing the debt is a reasonable order of magnitude.