.NET CORE DEVELOPER fo web application

Due to peak work, we are looking for a .NET CORE (C #) programmer, possibly with skills also on Svelte (or angular) for a few months' activity. It involves working on web platforms that are already under development. The work should be in packets of hours because it is not continuous (it depends on the analysis times). The overall projects are clear, but there could be blocks of a few weeks and then the progress of a step