24 year old midfielder Kian Spence joins the Millers on a 2 year deal after rejecting a new deal at Barrow.
"I can't wait to get going and test myself in this division and to show everyone what I can do.
"I want to get goals, create chances and work hard for the team." Spence told the Yorkshire Post
Boss Hamshaw added: "We have been tracking Kian over the last few years and are really excited by him. He covers a lot of ground and I'm really glad that we have been able to get it over the line.
"From day one when I met Kian I felt that he really wanted to be here and that really impressed me. He is a versatile midfielder and has a great strike from distance.
"He wears his heart on his sleeve, gives everything that he has got, but also has that touch of quality which is what impresses me."