It is good to have responsive web by using bootstrap.
However current camunda tasklist is not truly mobile friendly.

How about this way in case of mobile access to tasklist web apps?

• Filter pane can go to top-right menu (icon)
• Initial screen will show task-list only
• If task selected in the list, task-list pane should disappear and task-detail pane shows only.
• After completing task in the form, task-detail pane disappear and task-list pane show back.