Extension of the "tasks" App in Nextcloud

We are looking for a skilled developer who is familiar with the nextcloud ecosystem (https://docs.nextcloud.com/server/latest/developer_manual/) to extend the "tasks" app (https://github.com/nextcloud/tasks/) with some extra features.

Details are given after we took a look at your reference work in context to nextcloud.

Your final bid can be given after you got all details.