As a software engineer/artist I could spend copious amounts of time refactoring. However, at some point products have to be shipped. You can't just keep pushing deadlines back further and further. Instead I utilize the tips below to provide functional code that is also clean.
The DRY Principle.
DRY stands for "don't repeat yourself" and you shouldn't. If you do, STOP!
Repeating yourself will never be a good practice.
The programming gods invented functions for a reason. Start now by splitting up
What you might not of know is that there are three major categories of design patterns; creational, structural, and behavioral. Each category having a plethora of tools to help solve everyday software problems.
Understand The Computer
Knowing that the windows registry exists and how to edit it is not "understanding" the inner workings of a computer. Understanding a computer means having knowledge about things such as the data path on the CPU and different levels of cache.
If you don't understand how a CPU does computations such as multiplication down at a binary level, how are you suppose to think in terms of performance? When your application is eating up precious cycles for useless tasks, being able to optimize the program and utilizing your compilers internals to elevate things to a kernel level commands can become of utmost importance.
This one is really just based on how much experience a person has with the utilities of their trade. Currently I use VS Code + a Vim Shortcut plugins. I then utilize flake8 to keep my code style up to par and PyLint to ensure no bugs exist in my code.
I'm not saying switch to my tools, I'm saying start diving deep into how they work. Ask yourself, are there any menu's or options you haven't explored before? Mess around with them until you figure out. Can you use a tool in a way it wasn't meant to? Try it. Don't settle, expand it and put it into your pipeline.
This one is very important. Instead of writing a list comprehension that goes way past the end of the 79 character PEP8 line length, use multiple lines. Name variables appropriately and keep packages clean. All things that you should be actively striving for when writing code or refactoring.
Open source or not you should strive to get someone to review your code. This helps promote a more open environment and prevents bugs from making it into production code.
I could talk for hours on this one. Testing is essential. Start out with unit tests and verify small components of the system. Once you get a hold of how to do that, start adding integration tests for business essential parts of your application.
Have a ton of services? Test the main functionality of these programs by running smoke tests. Smoke tests are very light weight scripts that verify the conditions of your system. A good example of smoke tests is ensuring your FTP server is online and that the user can login.
Wrapping things up, you should always strive for clean and readable code. I hope that some of the items I've listed above can enable you and your team to create amazing and beautiful products for people all over the world.
Please feel free to share this post and comment anything I left out or might be able to improve on for my own sake.