How many of these people can there possibly be? Are there really that many jobs with such low visibility, low expectations that someone can get away with Just Not Working for more than a few days before it’s obvious?
For software development, I feel like being "overemployed" would be relatively easy as a mid-level or senior developer. Job #1 is your 'mainstay' job with decent pay/benefits (but requires more concentration), Job #2 would be the 'side' job that you could fulfill your responsibilities with minimal effort.
A full-stack dev with 7ish years of experience could easily create/maintain CRUD apps for a smaller company with minimal effort while focusing the rest of his efforts on a more challenging role at a larger company.
