A team of 3 can make a complete product according to [https://mis.eller.arizona.edu/what-is-mis#difference]. Business, Science and Engineering. I am the computer science part of the process.
The Systems Development Life Cycle runs in Phases. Job security becomes a problem. You no longer have your job once the phase requiring you is complete.
The things that influence creation of a new system are limited as such you may not have a job as long as the information system is working. It might take one job in five years. You get the job when the system requires an upgrade.
I write a complete system within a period of one month to six months. Systems Support is part of the Systems Development process that gets to have a long lasting job. I don't know how to integrate myself into the systems support phase though someone suggested that I take up a job as a data officer. However such a job, I can end up creating one whole new system within one hour: its data model, interface and the server-side and a system is complete.