The former New Zealand and Tonga international signed a two-year contract with the Bulls earlier today, making his return to English rugby league following stints with Hull FC and Wigan Warriors.
His career will begin in the Championship following Bradford's relegation from the Super League last season, but the 30-year-old is "looking forward" to the challenge.
"I am so excited to be joining such a big and well-known club like Bradford. I believe I will bring some experience and toughness to our team and I cannot wait to get started," Lauaki told reporters.
"The Championship is a challenge I am looking forward to. We will be going up against some good teams, who will be certainly looking forward to playing us.
"There is a really solid squad in place at Bradford but I want to be in the 17, which means I have plenty of hard work ahead of me."
Lauaki, who joins from NRL side Manly Sea Eagles, becomes the 30th member of Bradford's squad for the 2015 campaign.