After graduation, Dr. Das was with ITT Corporation's Advanced Technology Center in Shelton, CT, where he served as Director of Applied Technology Division. Then he held the position of President at Spectrum Digital Corporation (a telecommunications equipment company) from 1986 through August of 1988.
In 1988 he founded TranSwitch Corporation, a company which designs, develops, markets and supports highly integrated digital and mixed-signal (analog and digital) semiconductor solutions for the telecommunications and data communications markets. The Company's products are Very Large Scale Integrated (VLSI) semiconductor devices that provide core functionality for communications network equipment. The company is publicly traded in NASDAQ under symbol TXCC. Current market capitalization is around 2.7 billion US$.
He has authored and/or co-authored more than 25 papers in different journals, magazines, and conference proceedings. He is a frequent speaker at industry forums and has been invited to speak at major technical and non-technical functions and conferences. Dr. Das has been granted a number of patents in his field. Dr. Das is also an IEEE and ACM member.