After Sallie Mae, I joined a very small ( < 15 employees ) federal contractor called CTAC. They held a few small contracts with the federal government - and one very big one for the HHS.gov website.
My time with CTAC was, by majority, spent with the HHS contract, serving initially as a web designer, and after the federal webmaster retired, as the contractor webmaster for the entirety of HHS.gov internal and external web pages - of which there were thousands.
Though overwhelming at times, I learned extremely important skills in the areas of leadership, delegation, and collaboration while with CTAC.