I'm just about to get to know Taiga.io which is a project management platform and provides a scrum task-board as well as a kanban user story board.
However: Since it seems to be very common to track the "tasks" of an sprint on the task board if using scrum. If using kanban, you can track the userstories on the board and tasks are nested within the US and not pinned at a board as well - so there is no visual "movement" of the concrete working tasks as i understand.
Im now wondering if it is okay to just write user stories like tasks as the example of taiga.io shows: Kanban us-board example
(the user story ist not in the format like "As a , I want so that " but in a task description like "develop filereader" or "implement the db-sheme")
You can write user stories as tasks, cause sometimes is needed for planning a technical implementation.
I dont know Taiga.io but, for example, in Attlasian Jira, you can create a US "As a user I want to send an email", which could have a subtask called "Create service for sending emails"