He has been training with the Warriors since February of 2015.
The 25-year-old played for the Scotland Club XVin 2015, scoring a try and being named man of the match in a 23-18 victory over the Ireland Club XV.
The flanker recently helped Heriot’s on their way to being crowned BT Premiership champions with a win over Melrose at Goldenacre.
Jason received the BT Premiership Player of the Season award at the recent Scottish Rugby Club Awards