1. A computer system for visualizing relationships and relationship strengths of data, the computer system comprising: one or more computer processors; one or more non-transitory computer-readable storage media; and program instructions stored on at least one of the one or more non-transitory computer-readable storage media for execution by at least one of the one or more processors, the program instructions comprising: responsive to a determination that a first job of an extract, transform, load (ETL) job stream accesses a mainframe operating system, program instructions to retrieve at least a return code threshold for the first job from a data store, wherein the data store includes parameters for remote job submission, including one or more of: a target computer operating system type, a host internet protocol (IP) address or domain name system (DNS) server name, a userid and password for the mainframe operating system, a userid and password for an FTP server, an output class for job results, an output wait time, the return code threshold, a job file location, and a job file name; responsive to a determination that an option to build job control language is selected for the first job, program instructions to generate job control language for the first job utilizing parameters stored in the data store including one or more of: an output class for job results, an output wait time, the return code threshold, a job file location, and a job file name; responsive to a determination that the option to build job control language is not selected for the first job, program instructions to retrieve job control language for the first job from a library in the mainframe operating system, wherein the library comprises job control language for a plurality of jobs including the first job; program instructions to submit the first job to a job reader on the mainframe operating system using a file transfer protocol, wherein a job reader receives the first job via file transfer protocol (FTP), and submits the received first job to a job scheduler for execution; program instructions to parse a retrieved output file of job results; program instructions to determine a return code for the first job based, at least in part, on the parsed retrieved output file of job results; program instructions to compare the return code for the first job to the return code threshold for the first job; program instructions to determine if the job stream continues based, at least in part, on the comparison and, if not, program instructions to transmit an error message and aborting the job stream; program instructions to receive the first job including a selection of a job type; responsive to a determination that the job type of the first job is an ETL job type, program instructions to receive a selection of at least one data source, and one or more data transformation rules; program instructions to receive a selection of at least one data target; responsive to a determination that the mainframe operating system is selected for the at least one data source, or the at least one data target, or both, program instructions to receive one or more job parameters comprising one or both of: the return code threshold for the first job and an option to build job control language for the first job; program instructions to store the one or more job parameters for the first job in the data store; and program instructions to insert the first job into the job stream.