Number 8 Condy, from Penallta, made his debut for Cross Keys against fellow Dragons feeder club Bedwas in February 2014 and has gone on to make 23 appearances for the Gwent side, scoring four tries.
Condy captained Penallta to a Welsh Youth Cup title in 2013-14 before breaking into the senior game with Cross Keys.
Scarlets Head of Regional Development Gareth Jenkins said: "We're delighted to confirm that Jack will be joining us for the new season. He is a raw talent who's been making waves in the Premiership.
"Jack is a young lad, a big ball carrying 8, but he's new to this level and we're we are excited to see how he will develop within a professional environment and continue to grow as a player under the leadership of more experienced and mature players."
Commenting on the news of joining Scarlets on a Development Contract Condy said: "I am really pleased to have signed a contract to join the Scarlets ahead of the 2015-16 season. It's a great honour to join a club and Region with such a strong heritage as the Scarlets.
"I've really enjoyed my time with Cross Keys and would like to thank them for the last few seasons. Joining the Scarlets will give me an opportunity to continue my development as a player and it's something I'm really looking forward to."
Condy is the latest name to be added to Scarlets' squad ahead of season 2015-16 alongside Glasgow and Canadian winger DTH van der Merwe, outside half Aled Thomas, tighthead prop Will Taylor from Wasps, lock Tom Price from Leicester Tigers and Welsh qualified loosehead prop Dylan Evans. Internationals Liam Williams, Ken Owens and Rob Evans as well as George Earle, Lewis Rawlins and Phil John have committed their futures to the Scarlets with Rhodri Jones, Samson Lee, Jake Ball and Scott Williams all also set for a bright future at the region on National Dual Contracts.
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