All perfect praise be to Allaah, the Lord of the worlds. I testify that there is none worthy of worship except Allaah and that Muhammad, sallallaahu ‘alayhi wa sallam, is His slave and Messenger.
This transaction is so close to Riba or perhaps it is the very Riba because the owner of the company took the mentioned amount of money and disposed of it to provide cash money for himself.
He stipulated a condition upon the employee not to take back their money except after a year and to be repaid in double. So, it is like giving a loan on interest. This is the very form of Riba. Hence, this transaction is impermissible because it involves Riba. We advise the questioner to invest his money in lawful ways. There are many lawful ways that may result in greater benefit and profit.
Allaah Knows best.