Alfresco Chaining authentication AD

We are looking for an Alfresco Developer, with good knowledge of authentication management. We have Alfresco LDAP (active directory based) authentication and synchronization already configured, We need to add chaining-authentication (ie, LDAP and in failover alfresco internal one). Considering our context, there is no workaround (even if we already observed that authority-services-context trick works fine), we definitively need applicative accounts, ie not declared into LDAP/AD. We are looking for a developer able to configure chaining-authentication with ldap and Alfresco Labs V3 stable, CIFS/NTLM and FTP. We would prefer not have to switch to JAAS (but negotiable if ldap synchronization work as well). Good candidate will have required environment to test on his side (ie: his own AD), and integration and real probe will be done by us. We can pay by wire/payoneer/paypal/moneybookers/getafreelancer/rentacoder.