In game contract leaderboards can be found by navigating to the egg in the top left of your screen, tapping the green "CONTRACTS" tab, scrolling down to the teal "HISTORY" button, and then tapping on either your Total CS or Seasonal CS at the top of the screen. Both of these will bring you to the same menu, simply different tabs. From here, the player can switch between seasons, grades, and the all time leaderboard.