Visa is a well-established service provider in the banking vertical. London, United Kingdom is the location of their main location.
Right now, Financial Data Analysis, Scientific Method, and Data Analysis are frequently searched for professions at Visa. They recruit for offices in Foster City, CA, Austin, TX, Singapore and 16 other locations within United Kingdom and Mexico. See below for a list of 198 job offers at Visa for jobs like "Director, Global Network Processing" and "Product Analytics Manager - Visa Consulting and Anaytics".
Wikipedia provides a helpful article about Visa. Check out their social profile on Twitter for a different perspective. A resource not to neglect is the company's careers page with more information about job offers and career prospects.