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There are so many areas... there is game development, business apps, mobile apps, scientific apps, etc. So you'll get many valid answers depending on the area. Scientist, artist, magician, builder, engineer, etc.
We get to build new stuff - and are then lumbered with the maintenance and alterations. Sometimes, (if we are lucky), we get to knock it all down and start again. But most of the time we battle to tack on extensions to inadequate foundations.
A new client calls you, you know nothing about the system which is DOWN and the client is losing £10k/hour. There is a certain amount of stress involved and you're in damage-limitation mode. Afterwards when things are wet and smouldering you step through doing a forensic investigation to find out what caused it all and then specify a new fire detection system and sprinklers.
A mental rollercoaster ride.
Just make sure you keep a copy of everything you developed so that when you need to develop something else a year later or more, you may be able to find the solution in your past applications; rather than spend hours or days searching Google only to find yourself wasting time because a large percentage of the posts do not work.
On a good day, it's like being a mathematician. Usually it's like being a copy editor, and the text you're dealing with was written by a monkey and in some fake language that has rules so convoluted that you cannot remember more than half of the rules at the time.
I compare it with manual blacksmith work: you have some pieces of code and are hammering on the keyboard til the mud (bugs) are out.
Maintenance is like reshaping a nail and support is horse shoe business.
Press F1 for help or google it.
Greetings from Germany