Anyone on the team could be the one to pick up the ticket, so everyone should come to a consensus on what effort is involved.
Here's a brief description of features we provided.
Everything is written down
All uncertainties have been taken into account
Ticket split happens automatically
Integrations with many project management solutions.
You can choose exactly in which your team is working
Use different techniques to estimate tasks, issues and epics.
Split your employees to different teams.
Team can groom and estimate independently on their own.
Use plugins for the most popular tools to work on the estimation.
Estimate a task better with the Fast Tickets Estimator mobile apps.
Apps for iPhone and Android are available.
Here's a brief list of integrated Project Management Solutions.