English is by far the predominant language used to communicate with foreigners. German, French and Spanish follow on a large distance. You will be able to work and live in the Netherlands by just using English, as almost all Dutch have a good level of English.
However, government communication and other paperwork is still often in Dutch. Secondly, you might be able to get more out of your stay in the Netherlands by learning the language.
There is a wide range of Dutch courses available. The courses vary in duration, frequency and price. Your employer may even offer you free or reduced-rate Dutch courses in-house. It is worthwhile asking your employer about the options available.
You can find an overview of Dutch language courses on: https://www.iamexpat.nl/education/language-schools/dutch-courses-netherlands