The difference between junior developers and senior developers when get a development ticket.
Junior developers take the issue ticket verbatim and work on it.
Senior developers review the ticket, ask the ticket owners questions for any clarifications. Ensure what’s asked on the ticket is what the ticket owner intended to build. Assess the complexity and communicate the correct expectation on the level of effort. Assess the existing code to check if the code can be reused or extended. Then (s)he works on the ticket.
Senior developers usually complete the tasks faster correctly.