The website to apply for jobs in the Biden Administration is up:
https://buildbackbetter.gov/join-us/
The Plum Book from 2016 is up with positions you can apply for (2020 is pending):
https://www.gsa.gov/governmentwide-initiatives/presidential-transition-directory/federal-government-structure/plum-book
We have helped folks join previous administrations. Contact us to see how we can help you.