O4S, a three-year-old Gurugram-based SaaS Company, has raised an undisclosed amount in an extended Pre Series A funding by strategic investors. The investors include Amit Singhal, former head of Google search, Subhrakant Panda, CEO, MD at Indian Metals & Ferro Alloys Ltd, Siddharth Bhavnani, Founder at Antares Legal and Bikram Singh Bedi, President Strategy and…