Pimps: operators of the gray and black market. Immune to automation since companies that can hire developers don't want to be involved.
Prostitutes: people who provide a service that clients do not want automated.
Professionals: highly educated, very skilled. Automation just makes them go faster.
Project Managers: people who deal with the gestalt of legal/political/technical/institutional debt. They can't be replaced since you can't yell at an AI and expect them to just "fix it already".
There is overlap. Live music and much of the service industry. But as a general rule you pick one of the four and you should be fine.
It's interesting that you say no one could have predicted this. Labor saving devices are not exactly new.