A system can include a first financial account data system that may include first account data. The first financial account data system can perform a function according to a first process using the first account data. The system can include a second financial account data system that can include second account data that is unintegrated with the first account data. The second financial account data system can perform a function according to a second process, which can be different than the first process, using the second account data. The system can include a server with an application programming interface. The server can determine a data system among the first and second financial account data systems with which to execute a requested function received via a common user interface. The server can execute the requested function. The server can provide a result of the execution via the common user interface.