Billy Mankelow, 20, was kicked and stamped on more than 20 times by Richard Danter after the two men met at Leeds' Viaduct Club on 25 April.
Mr Mankelow, from Tonbridge, Kent, was discovered unconscious under a railway arch in Swinegate. He died in hospital.
Danter, 31, of Queen's Road, Leeds, pleaded guilty to the murder.
Leeds Crown Court heard Mr Mankelow had gone to the club after finishing work where he was seen dancing and socialising with Danter.
They left the club together at about 02:45 BST and headed towards the Dark Arches area of the city, where Danter launched what police have described as a "totally unprovoked attack".
Danter then went back into the club and told staff members he had just killed someone before attempting to hide Mr Mankelow's body by dragging him further into the arches.