There is almost finished (lets say 97%) social-type app for Android, written in Kotlin, which needs to be connected to the endpoints of currently being completed backend in Node.js, hosted on AWS. There is an Postman API collection available and some documentation/designs files.
It may be possible that some screens aren't exactly finished up to the designs, so your work may include making a little bit of frontend changes.
When we sign the NDA, I'll give the access to my GitHub repo and other assets for quotation. I prefer agile methodology, full cooperation with backend developers, European timezone is a plus here.