He has been working as a consultant for major organizations such as Canon Research Lab (CISRA), DSTO, Lucent and Fujitsu. In his previous job, he was a Lecturer at the School of Computing Sciences, University of Technology (UTS), Sydney. He also worked as Systems Engineer for the National Informatics Centre, New Delhi. He was a visiting scholar at the Distributed Computing and Communications Laboratory, Computer Science Department, Columbia University, New York and a visiting professor with IIT-Bombay. He has also been a visiting researcher with Fujitsu Australia Ltd, Sydney and CSIRO ICT Center, Australia.

Sanjay was a Member-at-Large, Technical Committee on Computer Communications (TCCC), IEEE Computer Society for a number of years. He an associate editor of the IEEE Transactions on Mobile Computing (TMC) and a member of editorial advisory board of Wiley/ACM International Journal of Network Management. He has served on program committees of several high quality conferences. Sanjay was the General Chair of ACM Sensys 2007 symposium. He also served as the Technical Program Committee Chair of IEEE Local Computer Networks -LCN2004 and ATNAC04 conferences and co-chair and general chair of the Ements-1 and Emnets-II workshops respectively. Currently he is on the steering committee of the ACM Sensys and Emnets. He is a senior member of IEEE and has been involved with IEEE Computer Chapter NSW, Australia as chair/secretary for number of years.