Language barrier for international employees - Researcher Deltares Employee Review

There are groups within Deltares where non Dutch speakers are not welcome. In some groups you are not invited to group meetings, or you are invited and they suggest you not to attend. They can decide to not renew your contract with absolutely no reason based on that you are not native Dutch speaker. I had very good annual reviews for the 3 years I worked there. Even after punting effort to follow Dutch lessons (at my own costs and time) and having an intermediate level. Not all groups are like this, but be aware than this has happened.