Battelle Energy Alliance (BEA), managing the Idaho National Laboratory, is seeking expressions of interest from software development vendors to provide backend engineering, integration, and documentation support for the National Reactor Innovation Center’s ARIES nuclear design and safety-basis platform. The work involves designing backend data layers, REST API development, and integration with external systems such as DOORS and Windchill. The engagement is planned from 09/01/2026 through 02/27/2027, with potential future taskings. Work may occur at the subcontractor’s remote facility, with coordination required on Mountain Daylight Time. This EOI is a preliminary step to identify qualified vendors for a potential future solicitation.