Hundreds of new jobs are expected to be announced later this week for Derry as part of a major expansion by FirstSource.
The Indian-headquartered firm already employs 500 people at its three-storey 30,000sq ft (9,144sq m) office block on the Northland Road and a number of other staff at an office in Belfast.
The company, which has been based in Derry since 2006 is expected to reveal plans for a significant expansion of its operations.
Firstsource, formely known as as ICICI OneSource, was founded in Mumbai in 2002. Its initial workforce of 750 has grown to over 9,000, with centres in India, the US, Britain, the Philippines and Argentina.
The company, whose clients include FTSE 100 and Fortune 500 companies, provides call centre and back office processing services for clients in the financial services, telecoms and media, travel and transportation and healthcare industries.
