I have just started using the todoist but couldn't find anything related to delegation of some task to other members of your team. I have used basecamp & you could easily invite someone to your project & then also assign the tasks to him. Is such a feature in the PREMIUM account or its not there at all.
Todoist is primarily a personal task manager and you can't invite other people into projects. If you're working in a team and would like to assign tasks to your colleagues, share documents, updates etc. we recommend our team-based project management tool https://wedoist.com