People still pay for customized software. Each company has some internal weird corner cases that are not covered by standard open source software, so you can sell the customization to them or be an employee that does the customization internally.

In a recent project I used standard libraries to connect IMAP, SMTP and web scraping. Nothing interesting. Just connecting tubes and a regular expression in the middle. And a for loop, to repeat it. Nothing interesting, but it's enough to be the computer wizard.