Website update and maintenance

I have a website that runs a professionally developed app on AWS. I need help updating the application and occasional maintenance. The app is programmed in Ruby on Rails but I don't expect to need programming, just assistance with managing it on AWS. Here is the website:
https://lreesmu.org/
And here is the information on the app:
https://www.wiso.uni-hamburg.de/forschung/forschungslabor/experimentallabor/aktuelle-projekte/hroot/

Current needs are to have the installation updated to current version and then a bit of clean up of the site. I would hope to find someone who would be able to do future small maintenance jobs as needed.