Not Pivotal or a large consultancy, I'm from Estonia but the company is Codeborne - www.codeborne.com they have been doing it for 12 years soon.
Large consultancy, pair programs all the time, Java... I would guess Pivotal
Pivotal doesn't exist anymore.
It has been acquired by Vmware and now it calls Tanzu Labs: https://tanzu.vmware.com/labs
Btw there are many other companies where you can pair: Thoughtworks and Codurance for example