Yes! It is also important to have an employment contract in writing.
You must have one in your possession by the time you start work.
Your contract is created in duplicate: one for you and one for your employer, Randstad. This kind of student contract is always for a limited period and ends on the expiry date.
You are also required to get a copy of the work regulations, for which you will sign a proof of receipt.
At Randstad it is possible to sign your employment contracts electronically. You can read the details in the link below.