You don't. You develop it as sloppy as possible and then make yourself indispensable to your company by being the only one who can maintain the pile of junk. S

You don't. You develop it as sloppy as possible and then make yourself indispensable to your company by being the only one who can maintain the pile of junk. Seriously speaking the following things help alot: 1.Reduce external dependencies. The less integration with 3rd party apis and services the less maintenance you will be doing. 2. Reduce external dependencies. 3. Reduce external dependencies. 4. Unit Tests 5. Integration Tests 6. End to End Tests 7. Reduce external dependencies.