Shahar started his career as a Network Manager at Cellcom. From 1998 to 2001 he was a Director of Sales Eastern Mediterranean at Teleglobe. From 2004 to 2011 he was a Co-chair and later the Chairman of OSS-ICDS Forum. During 2016-2017 Steiff served as a Co-Chair of Carrier-Grade Workgroup at Open Networking Foundation. From 2013 to 2018 he was a Co-chair at MEF Forum.