Two of Patni's key executives, Ajay Chamania and Deepak Khosla, who head the company's growing business units of product engineering services and the India market respectively, have resigned, people with direct knowledge of the developments said.

Patni, which was acquired by smaller rival iGate earlier this year, is currently in the process of integrating different business units and overlapping functions.

Patni's product engineering practice is a key vertical accounting for over 15% of the company's annual revenue and counts several large storage companies like EMC among clients. This unit has also been seen as a core differentiator for Patni and Chamania, an old Patni hand who has been responsible for building this.