Often engineering teams struggle with technical debt. They are busy with building features and fixing bugs, but that’s not going well due to a huge amount of technical debt. However, they hardly get any time to fix any of the debt.
In this article I’m going to share my experience on how to manage technical debt and get it fixed.
First of all, what is technical debt?
Technical debt is something that slows us down. Technical debt is a code that you are afraid to touch and if you do you produce multiple bugs. Technical debt is a messy code that does not let you ship features fast. Technical debt is an obsolete library version that doesn’t allow us to use the latest techniques.
Scalability issues though are not technical debt (more on that below).
In my experience, it happens simply because it nevers gets prioritised. And that’s usually due to the fact that software developers tend to speak of technical debt purely from a technical point of view. And a result, product managers, who drive prioritisation, don’t quite get the value of it - and that’s why work on fixing technical debt always ends up in the bottom of the backlog.
But technical debt does have business impact. Technical debt means that new features will take 2x, 3x, 10x times, as longer, if it were not for technical debt. Technical debt means you’ll dedicate a lot of time fixing bugs, instead of building new features.
Technical debt, like financial debt, means that you’ll spend your disposable income (dev time) paying off interest (fixing long outstanding technical debt) instead of spending it on fun things (new features that customers love).
So when persuading product managers to prioritise technical debt, do talk about the business impact it’ll bring. And talk about the negative effect if you postpone it. Ultimately, it is all about reducing time-to-market (time to build new features) and improving product quality (fewer bugs).
And speaking of prioritisation, I have observed two strategies:
Personally, I’m not a fan of the first one. Allocating a certain amount of time seems too arbitrary. There are occasions when addressing technical debt takes more a day a week. Sometimes there are times that you have nothing to address. Plus, that may also seem as a blackbox to non-technical stakeholders. Unless they explicitly ask engineers they won’t know what technical debt is being addressed and how that benefits the product.
Instead I prefer to prioritise technical debt along with features and bug fixes. No matter which software development methodology you use, chances are you have some sort of a backlog - a prioritised list of features and bug fixes. So just put technical debt tickets to that list and prioritise them accordingly.
This method has the following advantages:
I want to emphasise the second point - 'it is tied to the roadmap'. If you see on the roadmap that three new features will touch an ugly part of the code, then you can accelerate development by prioritising refactoring ahead of the feature work.
In the previous example, there are three features which depend on fixing technical debt. And it makes sense to prioritise technical debt separately. Multiple developers will work on those features, you don’t want them to depend on each other. So refactor first and let them build those features after.
But if the roadmap says that there’ll be only one feature that requires touching that scary piece of code, then you don’t even need to schedule any additional work. Just inform a product manager that a feature will take longer because you need to tidy up the code first. Otherwise (without refactoring), the work will take even more time and there’ll be a lot of bugs after.
Whatever you’re building probably depends on dozens of 3rd party libraries. And they tend to get new versions over time. You need to keep an eye on new versions and prioritise upgrades.
Nothing prevents you from improving the code quality while you’re fixing bugs or building new features.
Think that something can be refactored into a separate module? Do it!
Noticed that 3rd party library, you’re calling, is 3 major versions behind? Upgrade it!
But… be reasonable and avoid rabbit holes.
Will your new feature make a mess out of the existing code? Yes? Then, take your time and do it properly.
Have you noticed that the function you’re calling is difficult to understand, but you don’t have to change it? Just write a ticket about it and prioritise it separately.
When making such decisions also think of people who’ll be reviewing your code. The more things you’re putting in your pull request, the more time it’ll take for them to review and the more things they can miss in a review.
If your website is meant to serve 10,000 customers a minute, but is only capable of doing 500, then it’s not technical debt, it’s a very big gap in your product functionality. It’s the same thing as building a payment feature that only accepts Visa cards, but not MasterCard.
Yes, there might be the same cause for technical debt and scalability issues, for instance, you cut corners somewhere. But their impact is very different. As mentioned above technical debt does have a huge business impact, but the downfall from scalability issues is far bigger.
And if you need to get work prioritised, you need to clearly explain why it matters. So if you know that next month you’ll be serving more customers that your app is capable of, then this precisely what you should tell all non-technical stakeholders.
Another way to look at it - if you pause entire development, then technical debt will not be relevant - it won’t slow down anything, as there’ll be no features to build. But if people still use the product, well, they try and they cannot, because your system cannot cope with the demand, then it’s a gap in functionality.
I have written about it, the other people have written about it before. It is vital to have a good relationship between product and engineering. Both of you need to have trust. That’s because you’ll have to ask a product manager to pause feature/bug delivery and spend time on technical debt. They, in turn, need to trust you that that time will be well spent and ultimately will benefit users.
The opinions expressed herein are my own personal opinions and do not represent my employer's view in any way. My personal thoughts tend to change, hence the articles in this blog might not provide an accurate reflection of my present standpoint.
© Mike Borozdin