We are providing you the details of CDSL form the site of Wikipedia..

Central Depository services India limited provides a depository which gives us the facility of holding of securities in the electronic form and enables securities transactions to be processed by book entry.

CDSL is promoted by Bombay Stock Exchange Limited (BSE)[4] jointly with State Bank of India, Bank of India, Bank of Baroda, HDFC Bank, Standard Chartered Bank, Union Bank of India and Centurion Bank

Contact details of CDSL is:

Central Depository Services (India) Limited
Regd. Office: 17th floor, P J Towers, Dalal Street, Fort, Mumbai – 400001

You can also contact them online through their official website.
Currently there are no openings in CDSL if any job vacancy notification is issued I will let you know.