I don't know if this is a duplicate or not but it's as the title says. If you join a match while it's finishing, you'll recieve experience points from your previous match like you just played it, it shows your kd and everything, doesn't matter how long ago your last match was played.
Good luck Dev team. This is a great game and I'm excited to see it grow and improve.
(Non related suggestion: The intimidation could use more cursing and variation)