goodtimesintv, the first link is not that of a US Govt website, it's actually an employment agency. If you googled to find them, you would of noticed a yellow 'ad' next to the listing, indicating they paid to be placed first. Also, that whole website is nothing more than a come on, perspective job seekers will probably have to pay a fee and will be given the same application that anyone can get at a goverment office.
The US Post Office Career Hiring Process | Postal Jobs Authority
The second link for govenment contract jobs, appears to not show any openings at this time.
https://about.usps.com/suppliers/bec...ry-service.htm
Here's an actual USPS job information site.
https://about.usps.com/careers/welcome.htm After punching in your section of the country and selecting what positions they offered. You would finally get to a page with some jobs listed like cust svc or rural delivery, and you would have to register and submit an application, and someday 3 years from now they would interview you and ask if you want a Christmas job that pays $11 an hour.
The postal service jobs are not that lucrative and not that plentiful. If someone wants to get a good paying job with the governement, they should find out all they can about becoming an Air Traffic Controller.