It seems like the lender didn't recognize my work overseas and I only had 1 year and half of US working record.

You don't sound like you want to do the work of a landlord to be honest.

Currently, I am working on installing a new manufactured home with a new septic tank on the foundation.

Usually people have an exit strategy if the STR does not work out and can transition to LTR or MTR

People sometimes think they should hide as a landlord so no one knows, but that's not wise because it's so easy to figure out and then you become a lying neighbor/landlord.As others have said, just set ground rules for contact and how, use an online portal, and be responsive.

Just make sure to include a buffer (about 10-15%) for unexpected costs, especially if you’re working on an older home.

I'm from Dominican Republic, no product like that out there. the best option is to buy with the proceeds from the states. 

What has worked for you in a hot market like Austin?

Did you work with any real estate professionals (agents, lenders, etc.) that you'd recommend to others?

Was the work inspected?