Nenad Zeljković graduated from the School of Electrical Engineering in Belgrade, majoring in telecommunications. He completed his Master degree at the same faculty in the field of mobile radio systems. He completed his EMBA studies in 2013 as part of the Cotrugli Business School program.
Following his undergraduate studies, in 1997 he joined Telekom Srbija, where he was mainly in charge of planning and optimization of radio mobile network. From 2008 to 2012 he was holding the position of Head of Access network development and planning department, including the landline network.
He joined Vip mobile (now A1 Serbia) in 2012 as a Director of Access and Transport Network, with responsibilities in the area of network planning and construction. In the period from 2015 to 2017, his responsibilities extended to Si.mobile (now A1 Slovenia). Since 2017 he has been in charge of planning, construction and maintenance of Vip mobile access and transport network. Since November 2019, he has been holding the position of Senior Technology Director Officer at A1 Serbia and A1 Slovenia.