Advocate Siddhasen is a partner of a law firm named S.M. Kayda. He has a Master's degree in Corporate Law from Mumbai University. He is also a chief police trainer for the IPR police awareness program conducted by Apple. He has represented various MNCs, their power of attorney holders, and their employees in various courts of India, including High Courts. He has also worked with various banks as a legal consultant. He is also a co-founder of a pro-bono initiative named Lex-Vox