You need to keep a keen eye not only on the following key processes and artefacts to be successful in the long term.
Working Software (Code)That's obvious. If you don't have a product, you have nothing.
This not only includes what the customer sees, but also what is going on behind the scenes. The statement, "A kitchen where someone cooks is always messy" might apply to the developer's office, but it must not apply to the code.
Smelly code costs real money and binds capacity that would be better focused towards innovation and progress.
Test SuiteTo understand whether your product works correctly and does the right thing, you need a proper test suite. I radically proclaim "If your test isn't at least as clean as your productive code, don't bother".
A common (anti-)pattern I observe is that organizations de-prioritize testing in order to meet certain goals. Or, they actually put an emphasis on testing, but approach testing wrongly. The consequence? Flaky or unreliable tests that cause more trouble than they solve.
The money invested into testing is misspent if your tests are not well-managed, clean and comprehensible. However, abolishing your test suite equals abolishing your investment into sustainability. Don't ever reach this point.
From day 1 of a new product, invest into a proper test suite. Treat your test suite as the Holy Grail of long-term sustainability.
If you have existing software with that, go seek that Holy Grail - today!
Working BuildTo actually reach Continuous Integration - or beyond, you need a smooth, swift build process. You should be able to modify your build as easily as you can modify your product's features.
I see many teams and companies who under-emphasize their build process. A sad fact is that they all run into build problems sooner or later. Some can't manage their dependencies any more, some don't understand why their build is unstable - and the build becomes a nightmare for every developer!
Like you manage your code and the test suite, you must manage your build.This includes the build management system, the build artifacts as well as the build infrastructure.
EnvironmentA good product is not impeded by the environment, which includes technical infrastructure as well as corresponding tools and integrated components.
An overly complex or under-performing environment are equally detrimental to the success of your product.
For example, the wild growth of turnkey service solutions is the best way to lose control of what is actually going on. It is quite easy, for instance, to include a tracking or ad service. It is, however, incredibly hard to debug your software if such an external service is causing a malfunction in your product.
Another example, if you are using a myriad of virtual machines without having a proper hardware management will cause tremendous trouble when trying to find out what went wrong where, and why. The time lost to a poorly managed environment can quickly exceed the time you are actually spending on the product you're building.
Runtime"Works on my machine" - isn't it a running gag?
How do you control that the product also works in production? Of course, you need monitoring and feedback.
But technical monitoring doesn't cut it. Have you ever taken a detailed look into your log files? Whenever I engage with a new client, I take the liberty of scanning the productive logs for stack traces and the other obvious stuff ("Exception", "ERROR", "CRITICAL", "FATAL"). Doing that only takes a minute with grep and I usually find a myriad of stuff for the next retro.
Sometimes, the software doesn't display any obvious sign of malfunction for your (Dev-)Ops while thousands of users around the world have no clue why they can't reach their intended goal.
To understand and control your runtime properly is a tremendously important - yet oftentimes underestimated - success factor.
ConclusionYou must take care of five critical ingredients:
Code, Test, Build, Environment and Runtime.
Give sufficient attention to all of these will drastically reduce your risk of failure.
Ignore one of them and you will find yourself struggling to keep customer satisfaction and progress up.