Pfizer is an established manufacturer in the pharma and research verticals; their head office is in Surrey, United Kingdom.
In terms of recruitment areas, Pfizer is primarily hiring candidates in the categories Chemistry, Data Analysis, and Financial Data Analysis in Buenos Aires, Freiburg im Breisgau and Berlin. See below for a list of 15 unstaffed positions at Pfizer for job titles such as "Gerente de Producto Sistema Nervioso Central" and "Communications Analyst - Temporary 6 Months".
Wikipedia provides an informative article about Pfizer. Check out their social profile on Crunchbase for a different perspective. If you are interested in the company's unstaffed positions, their careers page is a great starting point.