OTR encryption specialist needed

We are having our own messaging application. And currently using an unique encryption method, but we want to change it into OTR encryption. The application is already working properly, yet the communication has to become OTR encryption in combination with OpenFire (xmpp). It is important that; - Users can invite each other - Users can create / share vCards - Users can be managed via OpenFire - Users can send text & send files You need to setup OpenFire server + implement OTR encryption within the app + documentation. We need this within one week. Do you have experience? Contact us. Budget $500